# Torque Converter > Torque converter: convert lb-ft, Nm, kg-m, and in-lb instantly for engine specs, fastener specs, and DIY repairs. Free, private, runs in your browser, no signup. - **Canonical URL:** https://boringtoolskit.com/torque-converter/ - **Category:** Converters - **Evidence level:** authored-methodology - **Reviewed:** 2026-09-20 - **Last verified:** 2026-10-12 - **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request. ## How it works Torque = value x (newton-metres per source unit), then newton-metres / (newton-metres per target unit). Factors: 1 ft-lb = 1.35582 N.m, 1 in-lb = 0.112985 N.m, so 1 N.m = 0.737562 ft-lb = 8.85075 in-lb. Enter 0 for N.m, 1 for ft-lb, 2 for in-lb. ## Worked example 1 lbf.ft = 1.356 N.m ยท 1 lbf.in = 0.113 N.m ## Assumptions - Inputs are treated as exact decimal values. - Standard (not historical or survey) unit definitions are used. - The calculation uses the factors at the precision shown in the formula panel; rounding beyond that is display-only and adds no accuracy. ## Common questions ### Why convert through N.m instead of directly? Routing every unit through a single base (N.m) means each unit needs one factor against the standard, and any pair combines cleanly. Direct pair factors drift apart over time in hand-maintained tables; a base-unit graph cannot. ### Where do these exact factors come from? From published standards (NIST: SP 811 torque conversions). Units like the inch are defined exactly (1 in = 2.54 cm since 1959), so conversions between standard units are exact, not approximate. ### How precise is the converted torque value? The conversion applies the standard factors shown in the formula panel. The practical limit is your input: the result only regroups the number you entered, so digits beyond your original reading do not add accuracy. 3-4 significant figures usually matches what the source measurement knew. ## Sources - [SP 811 torque conversions](https://www.nist.gov/pml/special-publication-811) --- *Local planning estimate. Verify current terms, rates, and policies before acting.*