0–60 mph vs 0–100 km/h: What's the Difference?

Is 0–100 km/h the same as 0–60 mph?

Do the unit maths and the gap is plain: 60 mph = 96.56 km/h, and 100 km/h = 62.14 mph. A 0–100 km/h run is a sprint to a slightly higher speed — the car has to keep accelerating for another 3.44 km/h after a 0–60 clock would have stopped. This is also why cars sold in the UK often quote "0–62 mph": it's the European 0–100 km/h figure from the same spec sheet, translated literally.

How much time do those extra few km/h cost? On a genuinely quick car — something in the 3–5 second bracket, still accelerating hard at 60 mph — the ballpark is about 0.2 seconds. On an ordinary family car, which is pulling far more gently by that point and may need another gearchange, it stretches to 0.3–0.5 seconds or beyond. The slower the car, the bigger the gap between its 0–60 and 0–100 km/h times. (If you time your own runs with an app such as PitLaunch, one launch captures both figures, so you can compare them directly on your own car.)

Which countries use 0–60 mph and which use 0–100 km/h?

0–60 mph belongs to the two big mph markets: the United States and the United Kingdom. Almost everywhere else — the rest of Europe, Australia, most of Asia and South America — quotes 0–100 km/h. Japan traditionally leaned on the 0–400 m sprint (roughly a quarter-mile), and drag racing worldwide still thinks in quarter-mile elapsed time and trap speed rather than a speed benchmark at all.

One wrinkle regularly wrecks cross-market comparisons: rollout. Most US-market 0–60 figures are measured drag-strip style with a 1-foot rollout — the clock only starts once the car has crept its first foot, typically worth 0.2–0.3 seconds versus a true standstill. European 0–100 km/h figures are normally quoted from a dead stop. Stack both conventions together and a manufacturer's US 0–60 time can look 0.4–0.5 seconds quicker than its European 0–100 km/h time for exactly the same car — most of that is measurement convention, not physics.

Why can't you convert 0–60 directly to 0–100 km/h?

Because a single headline number tells you nothing about the shape of the acceleration curve. Two cars with identical 0–60 times can post different 0–100 km/h times. One might be geared to pull cleanly to 105 km/h in second; the other needs a shift into third at 95 km/h and drops a couple of tenths right where it matters. A turbocharged engine at full boost keeps shoving past 60 mph, while a small naturally aspirated engine is starting to run out of breath. EVs muddy it further: many launch ferociously but taper as speed rises, so their 0–100 km/h penalty is often tiny even when their times to higher speeds fall back towards fast petrol cars.

If you only need a ballpark: add roughly 0.2 s to a quick car's 0–60 time (anything under about 5 seconds) to estimate its 0–100 km/h figure, and 0.3–0.5 s for ordinary cars; subtract the same going the other way. Then check the start convention — if one figure includes 1-ft rollout and the other doesn't, adjust by a further 0.2–0.3 s before comparing.

What's the next benchmark up — 0–100 mph?

Once cars get seriously quick, 0–60 stops separating them: modern performance cars are traction-limited off the line, so a four-wheel-drive hot hatch can hang with a supercar to 60. The revealing benchmarks start higher. 0–100 mph (about 161 km/h) is where aerodynamic drag and genuine horsepower take over from launch grip. At the strip, the quarter-mile is quoted as an elapsed time (ET) with a trap speed — the speed measured through the final section of the strip, the classic proxy for power-to-weight — while the ⅛-mile split shows how much of the ET came from the launch versus top-end pull.

How do you time 0–60 or 0–100 km/h yourself?

Not off the speedometer. Car speedos are legally required never to under-read, so in practice they over-read — often by a few percent — meaning an indicated 60 mph arrives before a true 60 mph. Proper timing means GPS. The benchmark hardware is a dedicated 10–25 Hz GPS performance box at £100–£300; the modern alternative is a phone app that fuses GPS speed with the phone's motion sensors, which delivers comparable practical accuracy for road and track hobby use when the phone is mounted rigidly with a clear view of the sky.

That's how PitLaunch works on iPhone: arm it, drive, and launch detection is automatic — one run captures 0–60 mph, 0–100 km/h, 0–100 mph, quarter-mile ET with trap speed, the ⅛-mile split, 50–70 mph roll-ons and peak G, timed to the hundredth of a second with a ± confidence band so you know how trustworthy each result is. Because the mph and km/h benchmarks come from the same launch, you get whichever figure your region quotes without doing anything extra. You can start from a true standstill or with 1-ft rollout, and every run becomes a shareable run card. Everything is processed on-device — no account, no tracking — with a free 7-day trial, then a monthly auto-renewing subscription at £6.99/month in the UK (priced locally elsewhere). It isn't a certified timing system, but mounted well with a good GPS signal it delivers practical accuracy comparable to dedicated GPS performance boxes for road and track hobby use — plenty to see how your car stacks up against the brochure figure.

One non-negotiable: acceleration testing belongs on a track, closed course or legal drag strip. Set everything up before you set off — or have a passenger operate the phone — never interact with it while driving, and always obey local laws.

Frequently asked questions