compressor cfm to scfm calculator compressor cfm to scfm calculator

kpm. Values are shown for single-stage, two-stage, and three- stage piston-type air compressors operating at 85% efficiency, and working on intake air under standard . How to Convert SCFM to CFM scfm refers to cfm under standard conditions. No matter what else is going on in your life, always remember to focus on your job. Here is the complete SCFM to CFM formula we derive further on: CFM = SCFM (14.7 psi Pactual ) (Tactual + 459.67) (68F + 459.67) Example of SCFM to CFM calculator use: 500 SCFM at 60F temperature and 16 psi pressure is equal to 452.41 CFM. If you compare the CFM to SCFM, the CFM unit doesnt tell us anything about temperature (T), pressure (P), humidity levels, and so on. Copyright 2023 EXAIR LLC. The two types of flow rate measurement are mass flow measured by weight, often used in chemical process industries, and volumetric flow measured in cubic feet per minute (cfm) (liters per minute). The calculation is based on standard conditions, You can convert from actual cubic feet per minute (ACFM) to standard cubic feet per minute (SCFM) using a relationship derived from the. scfh to Normal meter cube/hour. Scfm to cfm conversion chart can be a useful tool for these scholars. Convert Amps To Watts (A to W): Simplest Calculator + Conversion Chart, What Size Heat Pump Do I Need? It is a measurement of how fast air flows into or out of a space. Divide the value by 7.48. . ACFM to SCFM. To calculate the actual pump capacity required, we first make the conversion to ACFM based on 24" Hg. kJ. NEC 310.16 Table: Copper And Aluminum Wire Ampacity Chart, NEC 310.12 Table: Wire Sizes For 100-400 Amp Services (83% Rule), kWh To Therms Calculator + Conversion Chart (1 kWh = 0.03412 Therms), MMBTU To Therms Calculator + Chart (1 MMBTU = 10 Therms), Therms To MMBTU Calculator + Chart (1 Therm = 1/10 MMBTU), AWG To Circular Mils Chart (For 4/0 AWG To 20 AWG). These applications will - due to browser restrictions - send data between your browser and our server. For the best experience on our site, be sure to turn on Javascript in your browser. gallon (UK) gallon (US) Output. (1000-3000+ Sq Ft Homes), Thermostat Says Heat On But No Heat? Cookies are only used in the browser to improve user experience. SCFM Conversion. To find necessary Cv for a 55 SCFM flow: 55 18.8 = 2.93. cal/s. If you are starting up a compressor that has been off, let the tank fill completely once before starting your timing and recording of results. kcal/h. JavaScript seems to be disabled in your browser. If an air compressor generates 4 CFM of compressed air at 90 PSI, how much does it generate at 50 PSI, for example? SCFM has a standardization of conditions. It's really helpful and easy to use for students like us. formId: "cacf9339-e936-477c-9dd3-f6493f47617c" Mathematics is a critical tool for understanding the world around us. Using a stopwatch (there is one on your smartphone), time how long it takes from when the compressor starts running to the time it stops running. This correction factor depends on the pressure and temperature for each gas considered. Example: Suppose a certain valve has a published Cv factor of 3.75. 132/7.48 = ~17.65 Cu.Ft. This means that for every psi, there are 0.069 scfm. That's right; there's no need for anyone to come on-site! AddThis use cookies for handling links to social media. Conversion Between Standard Flow (SCFM) and Actual Flow (ACFM). Call or click today! The formula for converting SCFM to ACFM is as follows: ACFM = SCFM [Pstd / (Pact - Psat )] (Tact / Tstd) Where: ACFM = Actual Cubic Feet per Minute. Equations displayed for easy reference. I love it so much, but the only problem is the adds, it's so good and I get my work done easy, live this app will continue to use, this app is pretty good, but the camera is sometimes irritating to use. Apps can be a great way to help learners with their math. pressure is applied a volume of air - it gets smaller, vacuum is applied to a volume of air - it expands. Cylinder & Valve Sizing. That also means that the amount of air (mass of air, if you will) is not the same at all temperatures and air pressures. V 2 = (29.92/5.92) x 100 = 505 ACFM. This makes . Inlet Cubic Feet per Minute - ICFM - is used by compressor vendors to establish conditions in front of additional equipment like inlet filter, blower or booster. Pa: Pounds per square inch is the current absolute pressure in pounds per square inch. ConvertUnits.com provides an online conversion calculator for all types of measurement units. Absolute value functions and graphs worksheet answers, An equation of the line tangent to the graph of y=x+cosx at the point (0 1), Best android apps to teach math to autistic kids, Calculator slope intercept to standard form, Degrees celsius is how many degrees fahrenheit, Find parametric equations for the line with the given properties, How many are taking algebra but not calculus? . For every 20% of humidity increase over "standard conditions . It is common to rate compressed air consumption in Standard Cubic Feet per Minute - SCFM. Get math help online by speaking to a tutor in a live chat. Math can be confusing, but there are ways to make it easier. In systems with vacuum pumps, blowers, compressors, and heat exchangers, air pressure and temperature are constantly changing, which means the actual volume flow is changing. Note: Its a bit difficult to explain the differences between SCFM and CFM without going too much into physics and Ideal Gas Law. sales@coastpneumatics.com, Enter actual inlet temperature entering the blower in degrees Fahrenheit, Enter actual inlet pressure in PSIA, include any inlet losses you anticipate, Enter site Barometric pressure in PSIA, this will be dependent on elevation, Enter Relative Humidity as a percent, ie. If we have SCFM, we can convert them to CFM, if we know at what pressure and temperature these CFMs will be. SCFM differs from CFM mainly in that SCFM has these variables fixed. This variable nature of air calls for standardization (based on air pressure and temperature). You just plug in SCFM, P and T. Heres what you get in our example: CFM = 400 CFM ((15.3 psi 14.7 psi)((68F+459.67) (65F+ 459.67))) = 382 CFM. SCFM Calculator: Determine the number of gallons that make up the air compressor's tank; Calculate the value by dividing 7.48 by the amount; Turn off the air compressor to let out some pressure; The air compressor needs to be refilled now. Product. For all sales and equipment related quieres, contact us on: Find out more about Atlas Copco in your region: Light construction & demolition equipment, Small and easy to transport versatile towable compressor, HD & TD water-cooled and air-cooled aftercoolers, WSD water separators and IWD, EWD, WD & TWD drains, The Compressed Air Library (Whitepapers, Podcasts, etc.). Typically, portable air compressors connected to air tools for general use require a CFM rating of 0.1-5 at 70-90 psi. Note that the The Compressed Air & Gas Institute and PNEUROP have adopted the definition used in ISO standards withdry (0% relative humidity) air at 14.5 psia (1 bar) and 68 oF (20 oC). Enter actual inlet temperature entering the blower in degrees Fahrenheit. SCFM standard cubic feet of air per minute. Now, in most cases, we dont have exactly 1 atm pressure and 68F pressure temperature, and so on. All of this might sound a bit complex. Most of the size air impact wrench needed 4-5 cfm air flow @ 90 PSI. Compressors are rated in both kW and CFM. Calculator; Units conversion; Units conversion Please use a decimal point as separator! The formula to convert standard cubic feet per minute (scfm) to actual cubic feet per minute (cfm) is: SCFM to ACFM conversion calculator. Refill the . Once you do, you can just plug them into this SCFM to CFM converter and get the resulting CFMs: Here is an example of how this calculator works: Lets say we want to convert 500 SCFM to CFM at 60F temperature and 16 psi pressure. SCFM vs. CFM Find the volume of the air compressor tank in gallons. Too little pressure means the job wont get done. SCFM Vs CFM Explained: SCFM To CFM Calculator + Chart SCFM vs. CFM Find the volume of the air compressor tank in gallons. It works great. That is airflow at 1 atm (14.7 psi) pressure and 68F temperature (or 293K). Because of the difference in pressure and temperature, 400 SCFM will not equal 400 CFM. The flow rate measurement for vacuum is exactly the opposite of that for compressed air. Haven't gotten one guest one wrong yet. Q = Flow rate (SCFM). math problem, How to find square root equation from graph, Polynomial calculator given zeros and point. }); When customers call us trying to learn about the physics behind compressed air and wanting to understand what is best for them, they ask how to measure compressed air flow rate? It may seem complex, but it really is quite easy to do yourself (though our calculator makes it much easier!). Refill the Determine math tasks. (+ How Many Watts), Ceiling Fan Wattage, Power Calculator (+Running Costs Chart), 100 Amp Wire Size: Which AWG Wire For 100 Amps? Math will not be a problem for a long time, then it solved it! in. ACFM TO SCFM. It expresses the compressors ability to perform a specified amount of work at any given point in time. Both CFM and SCFM are units for measuring airflow. SCFM refers to "standard cubic feet per minute" or the given flow rate of air at standard room temperature and pressure. You will find the calculator (with calculated chart) below the explanation of SCFM vs CFM . One way is to clear up the equations. We also know that moist air sinks (due to higher density). Credit Application. Pneumatic Valves. Let's try the best Convert scfm to cfm calculator. The CFM you need for your air compressor will largely depend on the type and number of tools you use. Pressure is maintained under 90 PSI to calculate CFM values. It would be nice if you guys could get the software in a physical calculator so we can openly use math app in class, i got every answer right. And its there for a very important reason. CFM = 14.485 x D 2 x (psig + 14.7) Where: D is the orifice diameter in inches. We don't collect information from our users. CFM = Tank Volume in Cubic Feet x Standard Pressure (ATM) During a Cycle x Cranks per Minute. ACFM=SCFM* (460+Temperature (F))/530* 14.7/ (14.7+psig) If you read the gas flow at 100 SCFM at a temperature of 90 degrees F and a pressure of 40 psi, your ACFM flow is: The difference between ACFM and SCFM for this scenario is significant, so be thoughtful when checking your rotameter. Between CFM & PSI, these two measurements essentially define whether a compressor can meet the demand of your equipment. kpm/s. The formula for calculating FAD is pretty simple: take the volume of Free Air Delivery (Cfm) and divide it by 60. Because of this, we use SCFM for a more accurate indicator of a compressors air capacity. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Adjust pipe size accordingly. CFM is relevant to the internal capacity of an air compressor. 1 CFM airflow means that every minute, such a device will generate a total of 1 ft3 of airflow. Essentially, volumetric flow rate in CFM indicates the air flow rate measured for actual conditions, i.e. Great app tho. Utilizing the Tank Pump-Up Time method, lets test the efficiency & calculate the CFM of your compressed air system. 92% Improved Their Grades. That's what this page is all about. hbspt.forms.create({ Just keep at it and you'll eventually get it. SCFM to CFM Calculator This calculator is for converting SCFM (Standard Cubic Feet per Minute) into ACFM (Actual Cubic Feet Per Minute). This app definitely deserves a 5 star review I recommend it to anyone who is struggling with math. If the compressor loads at 80 PSI and unloads at 120 PSI, this equals a 40 PSI difference (also known as differential pressure). Get Study is a great way to improve your grades. 29.92 x 100 SCFM = 5.92 x V 2 ACFM. Measure Conversion. ACFM stands for Actual Cubic Feet per Minute. You can find metric conversion tables for SI units, as well as English units . It is called the Gas Compressibility Factor, or Z-factor. If you have any other questions, you can use the comments below and well try to help you out as best we can. See manufacturing solutions & peek inside EXAIRs culture of efficiency and problem solving. Here it is: To calculate CFM from SCFM, you need to know what is the pressure (in psi) and temperature (in F) youre calculating the CFM at. air), Latent Heat (BTU/hr) = 0.69 x CFM x gr. We would like to know how many CFM does this air conditioner generates, and calculate it from SCFM. SMC Part Builder. SCFM to CFM Calculator This calculator is for converting SCFM (Standard Cubic Feet per Minute) into ACFM (Actual Cubic Feet Per Minute). SCFM ACFM Calculator. Release air from the compressor. What is SCFM in Air Compressors. 1 scfh = 0.016669 scfm. This formula can be programmed into a calculator or spreadsheet. Loss of Pressure in Ounces per Square Inch . This should be clearly marked on the tank itself by the manufacturer. If you're having trouble understanding a math problem, try breaking it down into smaller pieces and clarifying each step. elevation 5000 feet (1500 m) - atmospheric pressure P act = 12.23 psia; Contact for general questions, product . 1 ATM = 14.7 PSI, 40/14.7 = 2.72, Tank Pump-up Time = 1 min 8.4 seconds (1.14 minutes), Standard Pressure During Cycle (ATM) 2.72 PSI, CFM = Tank Volume in Cubic Feet x Standard Pressure (ATM) During a Cycle x Cranks per Minute. SMC Videos and Applications. Example: A Model 3215 Vortex Tube consumes 15 SCFM at 100 PSIG (425 SLPM @ 6.9 BAR). An air compressor CFM vs psi chart can help you to do it the right way. CFM is the Flow or the compressors ability to continue performing a certain task over time. Using P1*V1/T1 = P2*V2/T2 should work. 75 gallons per minute to cfm = 12.04077 cfm. Includes 53 different calculations. Select a valve with at least a 2. No Drip Internal Mix Air Atomizing Spray Nozzle, No Drip External Mix Air Atomizing Spray Nozzle, No Drip Siphon Fed Air Atomizing Spray Nozzle, FullStream Cone Liquid Atomizing Spray Nozzle, HollowStream Cone Liquid Atomizing Nozzles, NEMA 4 Hazardous Location Cabinet Cooler Systems, NEMA 4X Hazardous Location Cabinet Cooler Systems, Gen4 Ion Air Jet/Gen4 Stay Set Ion Air Jet, How to Calculate Compressed Air Consumption. Convert standard cubic feet / hour to normal meter cube/hour, standard cubic feet/minute units. How to use: Input the site's ambient conditions - atmospheric pressure, temperature, and relative humidity. SCFM stands for standard cubic feet per minute and refers to the flow rate at standard conditions. The 0.2 difference is most likely because of the rounding that we did. Outputs are similar when looking at one of VMAC's direct competitors. For instance, if filling time is 200 sec than the mins will be 3.3. The best teachers are the ones who care about their students and go above and beyond to help them succeed. Make a Shortcut to this Calculator on Your Home Screen? To convert from psi to scfm, you would multiply the psi by the conversion factor. SCFM vs. CFM Find the volume of the air compressor tank in gallons. Looking for a little extra help with your studies? Here is the complete SCFM to CFM formula we derive further on: CFM = SCFM (14.7 psi Pactual ) (Tactual + 459.67) (68F + 459.67). Terms potentially extended to customers purchasing over $2,000 annually. Really would recommend you to download if you're struggling with maths like me, i gave 5 stars cause this app is almost perfect but there's one issue that i hope you can add, which is taking a photo. SCFM vs. CFM Find the volume of the air compressor tank in gallons. How Much Does 500 Watts Cost Per Hour? Quick Calculations: For every 1000 ft (305 m) of elevation increase over "standard conditions", ACFM demand increases by approximately 5%. In the absolute scales required by the ideal gas law, standard atmospheric pressure is 14.7 psi and standard temperature is 528 degrees Rankine, which equals 68 degrees Fahrenheit. Next, convert to standard pressure (ATM). Step 1: Calculate the ratio of absolute inlet pressures. scfm refers to cfm under standard conditions. T S = Standard temperature. Release air from the compressor. Terms potentially extended to customers purchasing over $2,000 annually. Below you'll find a variety of calculators intended to provide assistance when measuring on-site conditions and determining equipment specifications. Cranks per Minute - 1.14 minutes. Note: To convert SCFM to SLPM, multiply by the factor 28.3168. In compressed air terms, pressure delivers the force, yet horsepower delivers the flow. For example, if you had 50 psi, you would multiply 50 by 0.069 to get 3.45 scfm. Gas Flow Calculator MW: Standard / Normal SCFM NM3/hr: Mass lb/hr kg/hr: Volume (English) CFM ft ASL PSIA F PSIG: Volume (Metric) M3/hr m ASL BarA C BarG . You can convert from actual cubic feet per minute (ACFM) to standard cubic feet per minute (SCFM) using a relationship derived from the. It can be 350 SCFM, 390 SCFM, 450 SCFM airflow. In very specific cases SCFM can be equal to CFM; ie. What Are Your Biggest Compressed Air and Gas Challenges? Calculate Reset Print : Conversion Between Standard Flow (SCFM) and Actual Flow (ACFM) ACFM to SCFM Insert flow . Are you looking to learn more about the compressed air industry? Such that: A = the area in square inches of a cross-section of the pipe bore (3.14 x diameter squared/4). The compressor must provide the right amount of pressure, or force, needed to complete the process. The easier way to do all this is simply use our air compressor . If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. The SCFM (Standard Cubic Feet per Minute) rating given to an air compressor will signify the flow under standardized conditions: 68 F, 0% relative humidity, and atmospheric pressure of 14.5. Mathematics is the study of numbers, shapes, and patterns. Obviously, the reverse is also true. In measuring air flow, problems can sometimes occur in distinguishing standard cubic feet per minute (SCFM) from actual cubic feet per, Calculation Method to convert SCFM (Standard Cubic Feet per Minute) to ACFM (Actual Cubic Feet per Minute). To calculate the cost of compressed air based on electrical cost alone, use the following formula: To account for the deviation from the ideal situation, another factor is included. However, the same volume of air can have different temperatures, pressure, and humidity. The Pressure is on: PSI. Math is a way of solving problems by using numbers and equations. The actual air volume flow is often termed ACFM - Actual Cubic Feet per Minute. DC Wire Gauge Calculator: What Gauge Wire (12V, 24V, 48V)? air), Sensible Heat (BTU/hr) = 1.1 x CFM x t (std. In order to convert from standard to actual cubic feet per minute, the actual pressure and temperature must be known. SCFM to CFM Calculator This calculator is for converting SCFM (Standard Cubic Feet per Minute) into ACFM (Actual Cubic Feet Per Minute). The compressor can provide 3-4 cfm at 90 PSI if it has ten horsepower or more. Air is expanded to a standard condition of 14.7 PSI to calculate SCFM. SCFM always has a standard pressure level of 14.7 psi. Calculator + Chart (Natural Gas), Average Gas Bill For 1-Bedroom Apartment: State-By-State Cost Analysis, Average Electricity Bill For 4 Person Household (Survey Analysis), How Many kWh Per Day Is Normal? Read our blog post about Properly Sizing a System to learn more. Nl x 1.01325bar/6bar x (273.15 + 25 K)/273.15 K. We are here to serve your compressed air system needs 24/7/365. 80% Relative Humidity is entered as 0.80. SCFM Conversion Calculator. The term "SCFM" is an acronym that stands for Standard Cubic Feet per Minute. The Ideal Gas Law is accurate only at relatively low pressures and high temperatures. Temperature C. m/min. Online calculator to quickly determine Air Flow Rate through an Orifice. scfm refers to cfm under standard conditions. 40 gallons per minute to cfm = 6.42175 cfm. Release air from the compressor. To determine what the math problem is, you will need to take a close look at the information given and use your problem-solving . The calculator below can used to calculate ACFM: SCFM. To calculate CFM from kW, you need to know the efficiency of the compressor. From experience, we all know that warmer air rises (due to lower density). SCFM = ACFM (P A /P S T S /T A ) P A = Actual pressure. The air compressor cfm psi calculator formula is:CFM = Tank Volume in Cubic Feet x Standard Pressure (ATM) during a cycle x Cranks per Minute. Use the formula CFM = SCFM / ( (Pa / 14.7) * (528 / Ta)) to find the flow in cubic feet per minute. Too much pressure can damage the equipment and cause unexpected malfunctions. Clarify math equations Math is a way of solving problems using numbers and equations Clarify mathematic problem . Enter value, select unit and click on calculate. Standard Temperature (Ts) CFM doesn't consist of standard temperature. For low pressures (<150 psig) and temperatures in the range of 30-100 F, the compressibility will be close to 1.0. Release air from the compressor. Insert pressure. If you look at SCFM vs CFM, both are volumetric units of air. And then multiply the number by 1.5 to measure the needed SCFM for the air compressor. SCFM vs. CFM Find the volume of the air compressor tank in gallons. Barometric Pressure. Change the minutes to seconds timed (60 x 3= 180 seconds plus 9 seconds totals 189). Assuming your room temperature is 25 C (77 F), take. 1 cu ft = 28.316 8466 L. However, your "normal" liters need to be converted to actual liters at flow conditions. 93 Cv and it will meet the flow conditions. USE THIS FORMULA for air compressor CFM calculation: TANK GALLONS x .538* x PSIG divided by SECONDS. Pretty much all US manufacturers that produce devices with airflow will use the ASME airflow unit standardization. There are plenty of resources and people who can help you out. SCFM vs. CFM Find the volume of the air compressor tank in gallons. Some of our calculators and applications let you save application data to your local computer. By multiplying air velocity by the cross section area of a duct, you can determine the air volume flowing past a point in the duct per unit of time. Heres the simplified version: To truly understand what SCFM and CFM are and what are the differences between SCFM and CFM, lets look at each of them individually. Terms potentially extended to customers purchasing over $2,000 annually.Credit ApplicationW-9CA Resale Cert Form, Orange Coast Pneumatics, Inc., 3810 Prospect Ave., Unit A. Yorba Linda, CA 92886, Phone number : 714-312-5531, Business contact hours: 9 am - 5 pm, sales@ocaire.com. All rights reserved. Certainly makes math easier, otherwise is a gr8 app, Thank u for ur service. In all those cases, we dont talk about pressures and temperatures; we only talk about the volumetric amount of air. Insert flow, ACFM. Use our air compressor CFM calculator below to help you to quickly and easily calculate your CFM! Take the calculated CFM and compare to the compressor output. The pressure must be in absolute. To convert PSIG to BAR multiply by the factor 0.0689, Manufacturing Intelligent Compressed Air Products Since 1983. (NEC Code), BTU/h To Horsepower Calculator + BTU/h To HP Chart (To 72,000 BTU/h), Horsepower To BTU/Min: Convert HP To BTU Per Minute (Calc + Chart), HP To BTU/hr: Horsepower To BTU For A/C (Calculator + Chart). yd. P S = Standard pressure. SCFM stands for Standard Cubic Feet per Minute. SCFM to CFM Calculator. 56099+ Orders Deliver. Online SCFM - ACFM Calculator. Another fact to consider is how much of your equipment will be running at the same time? For SCFM-part, we know that this AC will generate 400 SCFM of airflow. Standard air flow is the baseline re. Our expert professors are here to support you every step of the way. Google use cookies for serving our ads and handling visitor statistics. If you're struggling to clear up a math problem, don't give up! Purpose: To convert actual cubic feet per minute (acfm) to standard cubic feet per minute (scfm) and vice versa. Knowing what each of them means will help us illustrate the main SCFM vs CFM differences: If you check the Ideal Gas Law, you can see why not all air (gas) is the same. So, if your compressor has a Free Air Delivery of 9 CFM, it would take 9 minutes to fill up a gallon tank at 100 PSI. The pressure must be in absolute. PSI measures the amount of pressure placed on a single square inch of space. air). Step 2: Multiply known flow by the above ratio you just calculated. Explore our wide variety of service options, ranging from service plans and parts plans to piping and installation, system design, and air audits and air analysis. kW. Calculation Method to convert SCFM (Standard Cubic Feet per Minute) to ACFM (Actual Cubic Feet per Minute). Importance of SCFM and CFM in calculation an air compressor. 400 CFM. Divide the value by 7.48. Actual Pressure. We can provide expert homework writing help on any subject. Insert pressure. (std. For more information about this conversion, click here. Start monitoring your compressor installation's energy efficiency with our no-contact audit. With insufficient flow, the compressor will require breaks to rebuild pressure in the compressors reserve tank. SC 29730. Please read AddThis Privacy for more information. As an Amazon Associate we earn from qualifying purchases. As we see, the only difference between SCFM and CFM is that inclusion of Standard. If you . l/s. Note: To convert SCFM to SLPM, multiply by the factor 28.3168. Using P1*V1/T1 = P2*V2/T2 should work. Outside of that range, you need an equation of state calculator to determine compressibility. Anaheim, CA 92807 SCFM: Measures the gas' volume flow rate, but in a . region: "na1", Payback Estimator; W2 Wire Thermostat Wiring (2nd Stage), Thermostat Wire Color Codes For 3-8 Wire Thermostats (Color-By-Color), How Many Therms Of Gas Per Month Is Normal? 449 Teachers. Fieldbus I/O Catalog. Using this calculator, you can pretty much convert any SCFM to CFM at any condition. Thats why we have come up with SCFM a standardized measure of airflow, expressed in CFM. Converting scfm to acfm Equations and Calculator . No matter what else is going on in your life, always remember to stay focused on your job. ($0.05 $0.22/h), How Much Does 1000 Watts Cost Per Hour? By standardizing the means of rating output, compressors can be better rated and compared, apples to apples. SCFM to CFM Calculator This calculator is for converting SCFM (Standard Cubic Feet per Minute) into ACFM (Actual Cubic Feet Per Minute). Some times it doesn't gets the problem unless you write it clearly again if the draw/write function was there it would have been much easier.