0–60 mph ↔ 0–100 km/h Converter

The 0–60 mph test (used in the US and UK) and the 0–100 km/h test (used in Europe, Japan, and most of the world) measure the same thing — acceleration from a standstill — but to slightly different endpoint speeds. 60 mph = 96.56 km/h, not 100 km/h. The 0–100 km/h test runs about 3.5% farther.

The formula

Under constant acceleration, time is proportional to speed. The ratio of the two test endpoints gives the conversion factor:

60 mph in m/s  = 60 × 1609.344 / 3600 = 26.8224 m/s
100 km/h in m/s = 100,000 / 3600      = 27.7778 m/s

factor = 27.7778 / 26.8224 = 1.035618...

t₁₀₀ ≈ t₆₀ × 1.035618

This is an approximation that assumes constant acceleration throughout. Real-world results depend on power curve shape, gear ratios, shift points, and tire grip.

Practical examples

Example 1 — Porsche 911 Carrera (0–60 = 3.5 s). Estimated 0–100: 3.5 × 1.03562 = 3.62 s. Porsche's published figure is 3.5 s (0–100 km/h) — the real car is actually slightly faster in the 0–100 test than the constant-acceleration model suggests, due to a favorable shift point.

Example 2 — Family sedan (0–60 = 8.0 s). Estimated 0–100: 8.0 × 1.03562 = 8.28 s.

Example 3 — Working backward from a European 0–100 figure. A car is listed at 5.5 s 0–100 km/h. Estimated US 0–60 mph: 5.5 / 1.03562 = 5.31 s.

Common mistakes

• Assuming the figures are interchangeable. A car rated "5.0 s 0–100 km/h" is not the same as "5.0 s 0–60 mph." The 0–100 run covers slightly more distance.
• Not accounting for the 1-foot rollout. US car magazine tests (Motor Trend, Car and Driver) typically measure from 1 foot of movement rather than a dead stop. This can reduce the reported 0–60 time by 0.1–0.3 s. European tests do not use a rollout allowance.
• Expecting exact accuracy from this tool. The constant-acceleration model is a useful approximation, not a precise conversion. Actual 0–100 times depend on the full acceleration profile of the specific vehicle.

International and regional variations

Quick reference