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Air tool CFM chart

Published air demand for every tool a home garage actually owns - with the source next to each number, the duty cycle beside it, and both figures shown where the two references disagree.

By Ryder M.Last updated Published
Pneumatic tools laid out on a workshop bench

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Full dataset

The chart

Every row below is a published figure. Where Ingersoll Rand's service-shop chart and Engineering ToolBox disagree, both numbers appear rather than an average nobody published. Where neither publishes a figure for a class, the cell says so - we would rather leave a gap than fill it with a guess.

Published air demand at 90 PSI, every tool class
ToolCFM @ 90 PSIAt loadDutyWhat the number means
Brad nailer, 18 gauge0.5-BurstThe most forgiving air tool there is. A nailer draws air only at the instant it fires, so almost any tank covers it. That is why a 1-gallon compressor is a genuinely complete tool for trim work rather than a compromise.
Finish nailer, 15 gauge1.8-BurstBostitch publishes 1.8 CFM of free air at 80 PSI for its BTFP72155 running 60 fasteners a minute - a fast, sustained trim pace, not casual use. At a realistic pace the draw is a fraction of that.
Framing nailer, 21 or 30 degree2.5-BurstEngineering ToolBox lists 2.5 CFM for a framing nailer on a 25% load factor. Metabo HPT publishes 0.09 SCFM at 100 PSI for the NR90AES1 on a per-cycle basis. The two describe the same tool at different firing rates, which is exactly why one CFM number for a nailer is misleading: nail pace sets the demand, not the badge on the tool.
Roofing / coil nailerNot published-IntermittentNeither published chart carries a separate roofing-nailer line. Roofing is fired far faster and for far longer than framing, so treat it as the top of the framing range and size for recovery rather than peak. We will not print a number no source publishes.
Upholstery / crown stapler2-BurstEngineering ToolBox lists 2 CFM for an upholstery stapler, measured at 30 PSI. Low pressure means low demand, and a small tank keeps up easily.
Impact wrench, 3/8"3 - 5-BurstIngersoll Rand's service-shop chart says 3 CFM; Engineering ToolBox gives a 2-5 CFM band. Both describe short bursts on fasteners, not continuous running.
Impact wrench, 1/2"4 - 522BurstThe most misunderstood number on this chart. Ingersoll Rand publishes 4.2 CFM average for the 231C and 22 CFM at load. The average assumes you hold the trigger for a second or two at a time. A 6-gallon pancake at 2.6 CFM does break lug nuts; it simply cannot keep the trigger down.
Impact wrench, 3/4"6-BurstPast the point where a portable garage compressor is the right answer. If you genuinely need 3/4-inch drive, budget for the compressor before the wrench.
Impact wrench, 1"12 - 10-IntermittentTruck and heavy-equipment territory. 12 CFM average is more than most 30-gallon single-stage compressors produce, let alone anything portable.
Air ratchet, 3/8"3 - 4-IntermittentIngersoll Rand publishes 3 CFM average at 90 PSI for the 105-D3; Engineering ToolBox lists 4 CFM for the class. A ratchet is the sneaky one: you hold the trigger far longer than with an impact, so it punishes a small tank harder despite the lower headline number.
Air ratchet, 1/4"3-IntermittentEngineering ToolBox lists 3 CFM. Ingersoll Rand does not publish an air-consumption figure for its 105-D2, so there is no second number to give you.
Air hammer / chisel4-IntermittentUsed in bursts on exhaust bolts and ball joints, a 20-gallon tank copes. Used continuously on a seized assembly, it will outrun anything under about 5 CFM.
Grease gun3 - 4-IntermittentModest and intermittent. Not a sizing constraint for any compressor on this site.
Tire inflation2-IntermittentBoth references agree on 2 CFM. Note the working pressure: you are filling to 35 PSI, not 90, so almost every compressor delivers more than it needs to. Tires are why so many people overbuy - the job is easy and the marketing is not.
Orbital / DA sander, 6 inch10 - 9-ContinuousIngersoll Rand lists 10 CFM for a body orbital sander; Engineering ToolBox gives 6-9 CFM for the class. A sander runs continuously by nature, so there is no burst allowance to hide behind. This is the job that genuinely needs a big compressor.
Vertical disc sander / polisher20-Continuous20 CFM continuous. No portable garage compressor of any tank size will run this. If body work is the plan, price a 60-gallon two-stage before anything else.
Die grinder, 1/4"5 - 6-ContinuousIngersoll Rand lists 5 CFM; Engineering ToolBox gives a 4-6 CFM band. Continuous duty, so a 6-gallon pancake gives you a handful of seconds before pressure drops and the tool slows.
Cut-off tool, 3 inch4 - 10-ContinuousEngineering ToolBox publishes a wide 4-10 CFM band because cut-off tools vary enormously. Whichever end yours sits at, it runs continuously, so size for the top of the band.
Air drill, 3/8"4-IntermittentBoth references agree on 4 CFM. Honest answer: a cordless drill is better for almost every home-garage drilling job, and needs no compressor at all.
Blow gun / dusting gun2.5 - 3-IntermittentIngersoll Rand lists 2.5 CFM, Engineering ToolBox 3. Held open continuously - clearing a sprinkler line, blowing out a filter - a blow gun empties a 6-gallon tank surprisingly fast.
Paint spray gun, touch-up4-ContinuousIngersoll Rand lists 4 CFM for touch-up spraying. Continuous while the trigger is down, and the air also has to be clean and dry - see our air-prep pages.
Paint spray gun, production / HVLP8 - 7-ContinuousIngersoll Rand lists 8 CFM for production spraying; Engineering ToolBox gives 3-7 CFM for small hand-operated sprayers. Check the gun's own spec sheet - HVLP demand varies more than any other tool class on this chart.
Paint spray gun, undercoat19-Continuous19 CFM. Undercoating and bedliner guns are not home-garage compressor territory on any budget.
Sandblaster / blast cabinetNot published-ContinuousEngineering ToolBox gives 6-400 CFM - a range so wide it is really a statement that the nozzle orifice sets the demand, not the cabinet. A small siphon gun sits near the bottom; a pressure pot with a 1/4-inch nozzle is industrial. We publish no single number because no source does.

Where two references publish different figures, both are shown rather than averaged into a number nobody published. Primary sources: Ingersoll Rand air consumption chart, Engineering ToolBox air tool consumption, and per-tool manufacturer specifications.

The part other charts omit

How to read the duty column

A CFM number on its own is nearly useless without knowing how long the tool runs. That is why this chart carries a duty column, and it is the thing that makes it different from every other air tool chart we found while researching this site.

Burst duty means the tool draws air for a second or two at a time: impacts, nailers, staplers. Tank storage covers these, which is why a 2.6 CFM pancake genuinely does break lug nuts. Intermittent duty means several seconds at a time with gaps: ratchets, air hammers, grease guns. Tank helps but the pump has to be in the right range. Continuous duty means the trigger stays down: die grinders, sanders, spray guns, cut-off tools. Nothing but pump output matters here, and a bigger tank buys you almost nothing.

The practical consequence: two tools with the same 4 CFM rating can put completely different demands on the same compressor. A 3/8-inch ratchet at 3 to 4 CFM will empty a small tank faster than a 1/2-inch impact at 4 to 5 CFM, because you hold the ratchet trigger for far longer. Charts that omit duty cannot tell you that.

Load factor, in the sources' own words

Engineering ToolBox states: "The ratings are based on 25% load factor - or tools running 25% of the time. Full performance requires 4 times the volume." Ingersoll Rand states: "For other use factors adjust the cfm air consumption on a proportional basis. (Example: 30 seconds on; 30 seconds off use 50% as use factor)". Both are telling you the same thing: the headline number already assumes you are not using the tool constantly.

Read this before you shop

The tools that catch people out

The 1/2-inch impact wrench. Published at 4 to 5 CFM average and 22 CFM at load. Every budget roundup on the internet pairs a 2.6 CFM pancake with one of these and calls it a match. It is not a lie, but it is a half-truth: the pancake will break the lug nut and then make you wait. If your honest workflow is four wheels in an afternoon, that is fine. If it is a full brake job, it is not.

The 3/8-inch air ratchet. Lower published demand than an impact, much harder on a small compressor, for the reason above. This is the tool that makes people conclude their compressor is broken when it is simply undersized for how they hold the trigger.

The blow gun. 2.5 to 3 CFM, which looks trivial, right up to the point where you hold it open for 30 seconds to clear a line. A blow gun held open is the closest thing to a continuous-duty load that most home garages ever generate.

The orbital sander. 6 to 10 CFM continuous. This is the tool that separates a garage compressor from a shop compressor, and no tank size closes the gap.

Published air demand at 90 PSI
ToolCFM @ 90 PSIAt loadDutyWhat the number means
Impact wrench, 1/2"4 - 522BurstThe most misunderstood number on this chart. Ingersoll Rand publishes 4.2 CFM average for the 231C and 22 CFM at load. The average assumes you hold the trigger for a second or two at a time. A 6-gallon pancake at 2.6 CFM does break lug nuts; it simply cannot keep the trigger down.
Air ratchet, 3/8"3 - 4-IntermittentIngersoll Rand publishes 3 CFM average at 90 PSI for the 105-D3; Engineering ToolBox lists 4 CFM for the class. A ratchet is the sneaky one: you hold the trigger far longer than with an impact, so it punishes a small tank harder despite the lower headline number.
Blow gun / dusting gun2.5 - 3-IntermittentIngersoll Rand lists 2.5 CFM, Engineering ToolBox 3. Held open continuously - clearing a sprinkler line, blowing out a filter - a blow gun empties a 6-gallon tank surprisingly fast.
Orbital / DA sander, 6 inch10 - 9-ContinuousIngersoll Rand lists 10 CFM for a body orbital sander; Engineering ToolBox gives 6-9 CFM for the class. A sander runs continuously by nature, so there is no burst allowance to hide behind. This is the job that genuinely needs a big compressor.

Where two references publish different figures, both are shown rather than averaged into a number nobody published. Primary sources: Ingersoll Rand air consumption chart, Engineering ToolBox air tool consumption, and per-tool manufacturer specifications.

Chart to purchase

Compressors that clear each band

The chart is only useful if it changes what you buy. These three are the cheapest units in our roster that clear each of the three bands the chart creates: nailing and inflation, burst automotive, and genuine continuous-duty work.

Quick picks

#ProductBest forScorePrice
1
A half-inch drive air impact wrench with a socket attached
Ingersoll Rand 231C4.2 CFM avg / 22 CFM at load600 ft-lb at 4.2 CFM average - and 22 CFM at load. The tool that teaches you what 'average CFM' really means.
Lug nuts and suspension bolts on a normal garage compressor4.3/10★★☆☆☆
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2
A compact three-eighths drive air ratchet resting on an engine component
Ingersoll Rand 105-D33 CFM avg / 1.8 lb3 CFM average and 1.8 lb. Lower demand than an impact on paper, harder on your tank in practice.
Fast bolt removal in places a socket wrench cannot swing7.0/10★★★★☆
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3
A high-capacity pancake air compressor with a roll cage
Metabo HPT EC914S (THE TANK)4 CFM @ 90 / 6 gal / 200 PSI4.0 CFM at 90 PSI and 200 PSI max - the only 6-gallon unit here that breaks the 2.6 CFM ceiling.
Getting real CFM without moving up to a 20-gallon footprint5.1/10★★★☆☆
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Scores are computed from manufacturer-published specs by the rubric on our methodology page. Nothing here has been bench-tested, and we do not publish prices we cannot verify.

Pick 1 - Ingersoll Rand 231C

4.3/10★★☆☆☆

Ingersoll Rand 231C

Best for: Lug nuts and suspension bolts on a normal garage compressor

Verdict

600 ft-lb at 4.2 CFM average - and 22 CFM at load. The tool that teaches you what 'average CFM' really means.

What it does well

  • 600 ft-lb max torque at 8,000 RPM, which is more than any lug nut needs
  • 4.2 CFM average at 90 PSI - a 4 CFM compressor keeps up with real-world use
  • The long-running industry default, so parts and service kits are everywhere

What it will not do

  • 22 CFM at load. Hold the trigger down and no garage compressor on this site will keep up
  • 99 dBA - wear hearing protection, this is not optional
  • Wants a 3/8" minimum hose ID; a 1/4" hose will throttle it
How this 4.3 was calculated
MetricScoreWeightBasis
Air economy4.340%4.2 CFM average at 90 PSI, on a 1.8-6 CFM scale (lower is better)
Handling5.025%No weight published - scored a neutral 5
Noise0.520%99 dBA, on an 80-100 dBA scale
Spec transparency8.015%4 of 5 useful figures published (average CFM, CFM at load, dBA, weight, minimum hose)
A half-inch drive air impact wrench with a socket attached

Licensed stock photo - illustrative of the category, not a photo of this unit

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Published specs

Ingersoll Rand 231C published specifications
Average air @ 90 PSI4.2 CFM
Air at load22 CFM
Performance600 ft-lb max torque, 8,000 RPM, 1,200 BPM
Noise99 dBA
WeightNot published
Minimum hose3/8" ID minimum

Source: Ingersoll Rand 231C impact wrench - product specifications

Pick 2 - Ingersoll Rand 105-D3

7.0/10★★★★☆

Ingersoll Rand 105-D3

Best for: Fast bolt removal in places a socket wrench cannot swing

Verdict

3 CFM average and 1.8 lb. Lower demand than an impact on paper, harder on your tank in practice.

What it does well

  • 3 CFM average at 90 PSI is the lowest automotive-tool figure Ingersoll Rand publishes
  • 1.8 lb and 7.3 inches long - it goes where your hand barely does
  • 25 ft-lb max with a 5-20 ft-lb working range, which is the right range for accessory bolts

What it will not do

  • You hold a ratchet trigger for far longer than an impact trigger, so a 2.6 CFM pancake will fall behind
  • 25 ft-lb will not break a lug nut - this is a removal tool, not a breaker
How this 7.0 was calculated
MetricScoreWeightBasis
Air economy7.140%3 CFM average at 90 PSI, on a 1.8-6 CFM scale (lower is better)
Handling10.025%1.8 lb, on a 1.8-8 lb scale
Noise5.020%No dBA published - scored a neutral 5
Spec transparency4.015%2 of 5 useful figures published (average CFM, CFM at load, dBA, weight, minimum hose)
A compact three-eighths drive air ratchet resting on an engine component

Licensed stock photo - illustrative of the category, not a photo of this unit

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Published specs

Ingersoll Rand 105-D3 published specifications
Average air @ 90 PSI3 CFM
Performance25 ft-lb max torque, 250 RPM free speed, 5-20 ft-lb recommended range
NoiseNot published
Weight1.8 lb
Minimum hoseNot published

Source: Ingersoll Rand 105 Series mini ratchet - product specifications

Pick 3 - Metabo HPT EC914S

5.1/10★★★☆☆

Metabo HPT EC914S (THE TANK)

Best for: Getting real CFM without moving up to a 20-gallon footprint

Verdict

4.0 CFM at 90 PSI and 200 PSI max - the only 6-gallon unit here that breaks the 2.6 CFM ceiling.

What it does well

  • 4.0 CFM at 90 PSI is 54% more air than the rest of the 6-gallon class
  • 200 PSI max means the same 6 gallons holds far more usable air
  • Clears the published average demand for a 1/2-inch impact and a 3/8-inch ratchet

What it will not do

  • 41 lb, the heaviest 6-gallon unit in the roster
  • Metabo HPT does not publish a noise figure, and high-pressure pumps are not quiet
How this 5.1 was calculated
MetricScoreWeightBasis
Air flow6.240%4 CFM at 90 PSI, on a 0.7-6 CFM scale
Stored air3.225%6 gal x 200 PSI = 1200, on a 125-3,500 scale
Noise5.015%Manufacturer publishes no dBA figure - scored a neutral 5, not a guess
Portability7.010%41 lb, on a 20-90 lb scale
Spec transparency3.310%2 of 6 useful figures published (CFM at 90, CFM at 40, dBA, duty cycle, recovery, weight)
A high-capacity pancake air compressor with a roll cage

Licensed stock photo - illustrative of the category, not a photo of this unit

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Published specs

Metabo HPT EC914S (THE TANK) published specifications
CFM @ 90 PSI4
CFM @ 40 PSINot published
Tank6 gal
Max pressure200 PSI
NoiseNot published
Duty cycleNot published
RecoveryNot published
PumpOil-free
MotorNot published
Weight41 lb
Power120V

Source: Metabo HPT EC914S THE TANK - product specifications

Honest limits

What this chart is not

It is not a measurement. We have not put a flow meter on any of these tools. It is a consolidation of published figures with their sources attached and their duty cycles named, framed for a home garage rather than an industrial plant room.

Ingersoll Rand puts its own caveat on its chart, and it applies equally here: always check with the tool manufacturer for the actual air consumption of the tool you own, because these are averages and should not be considered accurate for any particular make of tool. Your specific ratchet may differ from the class figure. Treat this chart as a shopping tool, and the sticker on your tool as the truth.

FAQ

Questions people actually ask

How many CFM to run air tools?

Nailers need well under 1 CFM. Tire inflation needs 2. A 1/2-inch impact wrench needs 4 to 5 CFM average. A 3/8-inch ratchet needs 3 to 4 CFM but holds the trigger longer. A die grinder needs 4 to 6 CFM continuously. An orbital sander needs 6 to 10 CFM continuously. Add 25% to whichever is highest on your list.

How many CFM to run a 1/2 impact?

Ingersoll Rand publishes 4.2 CFM average at 90 PSI for its 231C, and 22 CFM at load. Engineering ToolBox gives 4 to 5 CFM for the class. Size against about 5 CFM plus a margin; the 22 CFM figure is what the tank covers in bursts, not what the pump has to produce.

How is CFM calculated for an air tool?

Manufacturers publish it as a duty-cycle average: the volume of free air the tool consumes per minute at a stated pressure over a stated load factor, usually 25%. That is why the same tool can be listed at 4 CFM average and 22 CFM at load. Neither number is wrong; they answer different questions.

Does a longer hose reduce the CFM my tool gets?

Yes. Pressure drop through hose and fittings means the tool sees less than the compressor produces, and the effect gets worse with length, with smaller internal diameter, and with restrictive couplers. It is one of the three losses our 25% sizing margin is there to absorb. See our hose size chart for the diameters that matter.

Why do two charts give different CFM for the same tool?

Because they assume different load factors and test different tools. Ingersoll Rand's automotive chart uses average service-shop usage; Engineering ToolBox uses a stated 25% load factor. We show both figures rather than splitting the difference, because an averaged number would be one that neither source published.

Sources

Where these numbers come from

Accessed September 2026. If a figure on this page does not match the manufacturer's current sheet, tell us at contact@psiandhose.com and we will correct and date the change - see our editorial policy.

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