Torque Calculator
Quantify torque for engines, driveline setups, and static loads with lab-style transparency in both SI and imperial units.
Built for tuners, dyno operators, and test engineers who need traceable calculations tied to standards, gear ratios, and efficiency losses.
Uses the 5252 relationship common to dynamometer work.
Core inputs
Results
Engine torque
262.6
Engine torque
356.0378
Methodology
Engine torque follows the 5252 relationship linking horsepower and RPM; outputs are dual-reported in N·m and lb-ft for shop and lab contexts.
Static torque applies the moment arm relationship τ = F × r with unit-consistent conversion to lb-ft.
Wheel torque multiplies engine torque by gearbox and final drive ratios, then applies driveline efficiency to reflect measured losses.
Further resources
Related calculators
Expert Q&A
How should I measure horsepower or torque for best accuracy?
Use a calibrated chassis or engine dyno with recent NIST-traceable torque transducer calibration and stable intake temperature per ISO 1585 guidance.
What driveline efficiency should I use?
Typical street drivetrains range 0.85–0.93; high-performance AWD with heavy oil shear can drop below 0.80. Use manufacturer data or coastdown tests when available.
Why do results differ from shop to shop?
Variation comes from correction standards (SAE J1349 vs DIN 70020), ambient conditions, roller inertia, tire pressure, and whether torque is measured at the crank or wheels.
Sources & citations
- NIST Guide to the SI, moment definition — https://www.nist.gov/pml/owm/metric-si-prefixes
- ISO 1585 Road vehicles—Engine power test code — https://www.iso.org/standard/15951.html
- MIT OpenCourseWare Statics: moments and torque — https://ocw.mit.edu/courses/1-050-engineering-mechanics-i-fall-2007/pages/lecture-notes/
- SAE J1349 Engine Power Test Code — https://www.sae.org/standards/content/j1349_201110/