This treadmill pace converter translates belt speeds into runner’s language — pace per mile and per kilometer — and back, with the standard 1% incline note for matching outdoor effort.

Speed –
Speed –
Pace per mile –
Pace per km –

The 1% rule: setting the treadmill to 1% grade roughly restores the air resistance the belt removes, making paces feel outdoor-equivalent (the classic Jones & Doust finding, best supported at faster speeds). Belt calibration drifts ±2–3% between machines — trust your watch footpod or a measured belt count for precision work.

Speed and Pace Are Reciprocals — Fluency in Both Is the Skill

Treadmills speak speed, runners speak pace; the conversion is a reciprocal (pace = 60 ÷ speed) dressed in two unit systems. Race-day pace planning lives on our Pace Calculator. Part of our Sports Calculators collection.

Conversion Anchors (Verified)

  • 6.0 mph = 10:00/mi = 6:13/km (defaults) — the classic easy-run setting
  • 7.5 mph = 8:00/mi = 4:58/km; 10 mph = 6:00/mi = 3:44/km; 12 mph = 5:00/mi — the reciprocal's accelerating returns: each +1 mph costs less pace as speed rises
  • Walking band: 3 mph = 20:00/mi; 3.5 mph = 17:09/mi; 4 mph = 15:00/mi — incline walking at 3 mph/12% is the internet's 12-3-30 workout, arithmetically a 20:00/mi climb
  • Target reverse-engineering: a 25:00 5K = 8:03/mi = 7.46 mph on the belt (plus the 1% if matching outdoor feel)

Treadmill Truths

  • No wind, no terrain, a motor pulling the ground: treadmill pace at 0% is measurably easier than the same numbers outdoors — hence the 1% convention.
  • Belt speed displays are nominal; worn belts run slow. Serious workouts calibrate (chalk mark + revolutions over time).
  • Heat accumulates indoors: no airflow means core temperature climbs — perceived effort outruns the conversion chart by summer gym conditions.
  • Holding the rails rewrites the physics (partial weight support) — paces then flatter reality by far more than 1%.

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Frequently Asked Questions

How do I convert mph to pace per mile?

Pace = 60 ÷ mph, in minutes. 6 mph → 10:00/mile; 7.5 → 8:00; 10 → 6:00. Pace per km = pace per mile ÷ 1.609 (10:00/mi ≈ 6:13/km). This converter runs all four units both directions.

What treadmill speed is a 9-minute mile?

60 ÷ 9 = 6.67 mph (≈ 10.7 km/h). For a 30:00 5K (9:39/mi) you'd set ~6.2 mph; a 25:00 5K needs ~7.46 mph. Add the customary 1% incline when the goal is matching outdoor race effort.

Why set the treadmill to 1% incline?

Research (Jones & Doust, 1996) found 1% grade best replicates outdoor running's energy cost at typical training speeds, compensating for the missing air resistance and belt assistance. The effect is small at walking speeds and grows with pace — it's a convention for comparability, not a moral rule.

Is treadmill pace the same as outdoor pace?

Nominally yes, practically close-but-no: belt calibration error (±2–3%), no wind resistance, springy decks and indoor heat all bend equivalence. With the 1% setting and a calibrated machine, paces transfer within a few seconds per mile — enough for training prescription, not for settling bets.

How fast is 10 km/h in pace?

10 km/h = 6.21 mph = 6:00/km = 9:39/mi. Metric belts are common outside the US; this converter's km/h input exists because pace-per-km is the native language of most of the world's runners.

Is this treadmill pace converter free?

Yes — free, instant, no sign-up.