Why do automotive specs mix metric and imperial units?

OEMs and aftermarket brands publish in different systems depending on market. US catalogs often list lb·ft, psi, and inches, while European and Japanese sheets use N·m, bar, and millimeters. A converter lets you cross-check a dyno sheet, torque wrench, or tire pressure chart without guessing.

Is mechanical horsepower the same as metric PS?

No. One mechanical horsepower is about 0.746 kW, while one metric horsepower (PS/CV) is about 0.735 kW. On a 400 hp claim the gap is a few horsepower — enough to matter when comparing dyno graphs from different regions.

Should I convert tire pressure with this tool?

Yes for unit math (psi ↔ bar ↔ kPa). Still follow the vehicle placard for the recommended cold pressure, and adjust for load or towing with a dedicated tire pressure calculator when you need load-based guidance.

How precise are these conversions?

They use standard conversion factors (NIST-style constants for length, mass, and pressure). Display values are rounded for readability — for critical fastener torque or legal speed claims, keep a couple of extra digits from the full readout board.

What is cubic inches vs liters for engines?

Engine displacement is a volume. One liter is about 61.02 cubic inches, so a 5.7 L V8 is roughly 350 ci. Use the Volume category to jump between L, mL, and cubic inches when reading US vs metric build sheets.

Unit Converter

Cross-reference automotive specs between metric and imperial — torque, power, pressure, displacement, and more.

Full torque board

Same input, every torque unit — tap a tile to set the right-hand unit.

Automotive unit converter for metric and imperial specs

Built for shop work — torque, power, pressure, displacement, and speed — not generic kitchen conversions.
Convert one pair for a headline number, or read the full board when a dyno sheet mixes units.
Mechanical hp and metric PS are not identical — this tool keeps them distinct so regional claims stay honest.

Mechanics constantly jump between systems: a US torque wrench in lb·ft against a European service manual in N·m, tire pressure in psi next to a boost gauge in bar, or a crate engine listed as 6.2 L and 376 ci. This free automotive unit converter is meant for those cross-checks — enter the number you have, pick the category, and read every common unit on the board.

Categories cover length (offsets, bore/stroke), torque, power (hp / kW / PS), pressure, weight, volume (including cubic inches), speed, and temperature. Values update instantly on the client — no account, no wait — so you can keep a phone on the fender while you work.

Treat the readout as a precision aid, not a substitute for OEM torque procedures or legal speed claims. When fastener torque or emissions paperwork is on the line, verify against the manufacturer’s published table after you convert.

Prefer a dedicated page? Use the Length Converter, Torque Converter, Power Converter, Pressure Converter, Weight Converter, Volume Converter, Speed Converter, Temperature Converter, Displacement Converter — same math, focused on one job.

How to convert automotive units

Pick a category. Choose length, torque, power, pressure, weight, volume, speed, or temperature from the category menu.
Enter the value you have. Type the number from your dyno sheet, torque wrench, or parts catalog into either side.
Read the paired result and board. Change units on either card, or tap a board tile to set the right-hand unit.

Unit Converter

Full torque board

Automotive unit converter for metric and imperial specs

How to convert automotive units

Unit converter FAQ

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