Convert newton-meters, foot-pounds, inch-pounds, kilogram-force meters, and dyne-cm.
Convert torque between five units used in mechanical work: newton-meters (N·m), foot-pounds (ft-lb), inch-pounds (in-lb), kilogram-force meters (kgf·m), and dyne-centimeters (dyn·cm). Enter a value in any one of them; the tool returns its equivalent in the other four, scaled by the exact physical constants that relate the units. The surprise for most users is how far apart the units sit: ft-lb and in-lb differ by a factor of 12, N·m and kgf·m by about 9.8, so choosing the wrong unit is no rounding error - it changes the torque by an order of magnitude and turns a loose bolt into a stripped one.
A concrete input and expected output from the current implementation.
Input
100 N·m
Expected output
73.76 ft-lb, 885.07 in-lb, 10.20 kgf·m, 1,000,000,000 dyn·cm
Each output is 100 times the fixed ratio: 1 N·m equals 0.7375621 ft-lb, 8.8507458 in-lb, 0.1019716 kgf·m, and exactly 10,000,000 dyn·cm. Checking: 0.7375621 x 100 = 73.75621, and 10,000,000 x 100 = 1,000,000,000.
Each pair of units is linked by an exact ratio fixed by the definitions of the units: 1 lbf = 4.4482216152605 N and 1 ft = 0.3048 m make 1 ft-lb equal 1.3558179483 N·m, and 1 kgf = 9.80665 N with 1 dyn = 1e-5 N define the rest. Converting is one multiplication by the ratio in one direction and a division in the other, so the result is exact to the digits shown.
You enter a single value with its unit and get the equivalent in all four other units at once, so a spec found in a US manual (ft-lb), a European one (N·m), or a Japanese one (kgf·m) can be compared on one screen. Because every ratio is reciprocal, converting an output back yields the number you started with, differing only in the last displayed digit by rounding.
About 108.5 N·m. The converter multiplies 80 by 1.3558179, the ft-lb to N·m ratio, and returns 108.47 N·m. Do not just swap the numbers: setting 80 N·m for an 80 ft-lb spec under-torques the fastener by roughly 26 percent, enough to leave a wheel or cylinder head loose.
For torque, yes: both mean one pound of force applied at a one-foot lever arm, and the tool treats them as a single unit. Elsewhere, foot-pound is also the imperial unit of energy, used for muzzle energy and work. Energy and torque share the ft-lb symbol but are different physical quantities, and this converter only handles torque.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
Create customizable checklists with groups, due dates, and priorities for any project.
Design a printable daily planner with time blocks, goals, and priority sections.
Measure your typing speed in WPM and accuracy with real-time feedback and stats.
Pomodoro timer with built-in ambient noise (rain, cafe, forest) generated via Web Audio API oscillators.
Stay focused with a customizable Pomodoro timer featuring work and break intervals.
A precise stopwatch with lap tracking, split times, and exportable results.