Torque Converter

This torque converter takes one number and shows it in all eight units at the same time, newton-meters, pound-feet, pound-inches, kgf·m, ounce-inches and the rest, live as you type, instead of the usual pick-a-from-unit-and-a-to-unit dance that hands back a single answer. That all-at-once view is the point, because the single-answer setup is exactly how people strip threads. You dial 5 into a torque wrench for a spec of 5 lb·ft, never clock that the wrench is set to inch-pounds, and you've just applied a twelfth of the torque the bolt needed. Here, 5 lb·ft and 60 lb·in sit in the same list, so you catch the mix-up before the wrench moves. It all runs in your browser, nothing you type leaves your device, and once the page loads it keeps working with no connection at all.

1. Type your number in the Value box. Whole number, decimal, or scientific notation like 2.5e2, they all work.
2. Pick the unit you have in the From dropdown. That's the only unit you set, there is no "to" unit to choose and no convert button to chase.
3. Read the table right below it. Your value shows up in every other unit at the same time and it re-figures the instant you type.
4. Need just one figure? Hit copy on that row and it's on your clipboard, formatted and ready to paste into a spec sheet.
5. Want to hand someone the exact conversion? Use Copy shareable link, and the link reopens this page with your number and unit already filled in.

Pound-feet and pound-inches are both imperial torque units, and they differ by exactly twelve, because a foot is twelve inches, which puts one pound-foot at twelve pound-inches. That factor is where the real damage happens. A bike stem bolt spec'd at 5 lb·ft, dialed to 5 on a wrench that actually reads inch-pounds, gets a twelfth of the torque it needed, so the bolt is barely snug and the bars can slip mid-ride. Run it the other way, a 20 lb·in spec cranked to 20 lb·ft, and now the fastener takes twelve times what it should, which on something small is how you shear the head clean off.

Both units exist for a plain reason, readable numbers. Small stuff (electronics, optics, bicycle parts, spark plugs) lives at low torque, and 5 lb·in reads better than 0.42 lb·ft. Big stuff wants serious torque, and 100 lb·ft beats writing out 1,200 lb·in. Rough rule, inch-pounds for small fasteners, foot-pounds for big ones, and on the metric side N·cm for small and N·m for big.

This is the exact slip the all-units table is built to stop. With 5 lb·ft and 60 lb·in both shown as their own rows, there's no moment where you're trusting a half-remembered factor while holding a wrench. You see both and pick the one your wrench is actually set to.

If you've bought a hobby servo, you've seen it rated something like 10 kg·cm, and that's not a typo for kilograms. It's kilogram-force centimeters (kgf·cm), the stall torque the servo holds on a one-centimeter arm. The kilogram is really a unit of mass, so it should strictly be written kgf·cm, but datasheets from a lot of Asian and older European makers drop the f, and you just have to know a bare "kg·cm" means kgf·cm. One of those is about 0.0981 N·m.

The bigger cousin is the kilogram-force meter (kgf·m), which bakes standard gravity straight into the unit. One kilogram-force is the weight of a kilogram under standard gravity, fixed by agreement at exactly 9.80665 newtons, so one kgf·m is exactly 9.80665 N·m. These units stuck around because the torque number matches the weight number and you skip the mental multiplication. Physicists never loved that, it blurs the mass-versus-force line, but on a servo datasheet convenience won. The kgf·m is one of the eight units the tool takes, so drop a value in and read N·m or lb·ft straight back. The servo's kg·cm isn't on the list, so multiply it by 0.0980665 to get N·m first, then paste that number in.

Seeing every unit at once also catches wrong-unit grabs. If your converted number lands nowhere near what the fastener should take, you grabbed the wrong unit somewhere. So it pays to carry a few ranges in your head. An eyeglass screw is around 0.1 N·m. A laptop screw, maybe 0.2 to 0.3. A bicycle stem bolt runs 4 to 6 N·m (about 35 to 50 lb·in). A spark plug, 18 to 30 N·m. A car lug nut sits around 80 to 130 N·m (roughly 60 to 100 lb·ft), and a heavy-truck lug nut climbs to 400 to 600. If a result comes out ten times off from the range you were expecting, that's your wrong-unit tell. Check which unit you picked before you reach for the wrench, not after.