Fidamen

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.

Updated Nov 17, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record c9e57d7b6622 • Reviewed by Fidamen Standards Committee

Uses the 5252 relationship common to dynamometer work.

Inputs

Results

Updates as you type

Engine torque

262.6

Engine torque

356.0378

OutputValueUnit
Engine torque262.6lb-ft
Engine torque356.0378N m
Primary result262.6

Visualization

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.

F.A.Q.

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

Further resources

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: c9e57d7b6622

What changed (latest)

v1.1.0 • 2025-11-17 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.1.0

Data

Baseline (no external datasets)

Content

v1.1.0

UI

v1.0.0

Governance

Last updated: Nov 17, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.1.0 • 2025-11-17 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: bb4c9d6a69cc