How to Read a Torque Rating
Torque is the number every cordless tool leads with and the number that survives cross-brand comparison worst. Three separate ambiguities sit inside it, none of which a manufacturer is obliged to resolve for you, and all three can be present in a single figure.
What torque is, in one paragraph
Torque is rotational force — how hard the tool twists, not how fast. It is measured in newton-meters (Nm) or inch-pounds (in-lbs), and a tool that produces more of it can drive a larger fastener into denser material before it stalls. Speed, measured in RPM, is a separate property and the two trade against each other through the gearbox: a drill’s low gear gives you torque, its high gear gives you speed, and the motor behind them has not changed.
Ambiguity one: hard joint or soft joint
The same tool produces meaningfully different torque figures depending on what it is driving into, and both measurements are legitimate.
A hard joint drives a fastener against sudden, unyielding resistance — steel into steel, where the fastener seats almost instantly. A soft joint lets resistance build gradually as the fastener draws into compressible material, such as a lag screw pulling into timber. An impact mechanism has time to deliver many more blows into a soft joint before the fastener seats, so the figure it can claim there is higher.
Nothing requires a manufacturer to state which condition produced the number on the box. Two tools with identical printed figures may have been measured under different conditions, and the one with the lower number may be the stronger tool.
Ambiguity two: fastening torque or nut-busting torque
Impact drivers and impact wrenches carry two torque figures and they are not interchangeable.
Fastening torque is what the tool can apply while driving a fastener in. Nut-busting torque, sometimes called breakaway torque, is what it can apply to free a fastener that is already seized — typically a substantially larger figure, because the tool is delivering short shocks against a static load rather than working against continuous rotation.
A brand quoting the larger of the two is not lying. It is choosing, and unless the packaging says which, you cannot tell what you are comparing. On our drill and driver comparison the impact-driver figures we could verify cluster around a median of 169 Nm across nine listings — but that sample almost certainly mixes both conventions, which is part of why it carries an explicit caveat rather than being presented as a category average.
Ambiguity three: the units
One newton-meter is approximately 8.85 inch-pounds. That conversion is where a great deal of published error lives, in both directions.
| If a listing says | In Nm | What it plausibly is |
|---|---|---|
| 150 in-lbs | 16.9 | A compact drill/driver |
| 400 in-lbs | 45.2 | A mid-range 18 V drill/driver |
| 1,500 in-lbs | 169.5 | An impact driver |
| 1,000 Nm | 1,000 | An impact wrench, or a transcription error — check twice |
A number in the low hundreds is ambiguous on its face: 200 could be a strong drill in Nm or a weak one in in-lbs, and the two differ by nearly nine times. Always carry the unit with the figure.
A caution from our own data. When we audited the specification fields behind this site, five listings in the measuring category recorded a torque value of 635 to 680 — read from strings like 680nm. Those are laser wavelengths in nanometers, not torque in newton-meters, and the letters are identical apart from case. It is a machine-scale version of exactly the mistake this section is about, and it is the reason every figure on this site is now checked against the unit its source text actually carried.
What to compare instead
Torque is not useless — it is simply weak. These figures carry more weight when comparing two tools:
| Specification | Comparability | Why |
|---|---|---|
| No-load speed (RPM) | Strong | Measured without load, so the method is effectively fixed |
| Impact rate (BPM / IPM) | Strong | A mechanical property of the mechanism, not a test outcome |
| Chuck capacity | Strong | A physical dimension with nothing to interpret |
| Bare-tool weight | Strong, if stated bare | Kit weight with a pack fitted is a different figure — confirm which is quoted |
| Gear count | Strong | Two speeds resolve the torque-against-speed compromise; one speed does not |
| Max torque | Weak | Three undisclosed ambiguities, any of which can be present |
| Claimed runtime | Very weak | Meaningless without the pack capacity and load condition stated |
The practical rule
Use torque to place a tool in a class — compact, general-purpose, high-torque — and not to separate two tools within a class. If two candidates are within about 20% of each other on paper, treat them as equivalent on torque and decide on the specifications above, on ergonomics, and on which battery platform you are already committed to.
The measured distribution for drills and impact drivers, with the sample sizes visible, is on the drill and driver spec comparison.
Fewer than one listing in six publishes a torque figure at all
Torque is the specification buyers are most often told to compare on a drill or an impact driver, and in this corpus only a small minority of listings state one. That makes the comparison impossible for most of the market rather than merely difficult. Where a figure is absent this site prints not stated rather than inferring one from voltage or price, both of which are poor predictors, and the practical consequence is that torque is a tiebreaker between the tools that publish it rather than a way to rank the category.
The other numbers on the same tool
Where torque is absent, the specifications that are stated more often are speed and, on some tools, impact rate. Neither substitutes for torque and both describe something real: speed decides how fast a fastener runs in once it is moving, torque decides whether it moves at all. A tool quoting an impressive speed and no torque is describing the easy half of the job. Reading the two together, where both exist, is more informative than ranking on either alone.
Common questions
Is more torque always better?
No. Excess torque on a drill/driver without a well-resolved clutch means stripped screw heads and fasteners buried below the surface. Beyond the point where the tool drives what you need it to, more torque buys weight and cost rather than capability.
Why do two drills with the same rating feel so different?
Because they may not have been measured the same way, and because torque is one input among several. Gear ratio, clutch resolution, chuck runout, weight distribution and the electronics governing current delivery all shape behavior under load, and none of them appear in the headline figure.
Do higher-voltage tools always produce more torque?
Not reliably. Voltage sets a ceiling on available power; the motor and gearbox decide how much of it reaches the chuck. In our drill data the voltage column barely moves while torque spans a factor of three across the interquartile range.
Should I convert everything to one unit before comparing?
Yes, and state which unit you converted to. Most published errors in this area come from comparing a figure in Nm with one in in-lbs without noticing.