A treadmill pace converter that translates any km/h or mph speed into running pace (min/km or min/mile), projects your finish times across six standard race distances, and calculates calorie burn using the ACSM metabolic equation. Whether you are dialling in marathon training, comparing workout intensities, or simply puzzled by the number on the console, this tool gives you every figure in one place — no sign-up, no ads, nothing uploaded.
How it works
Speed ↔ Pace conversion
The relationship between speed and pace is a simple reciprocal scaled by 60 minutes:
Pace (min/km) = 60 ÷ Speed (km/h)
Pace (min/mile) = 60 × 1.60934 ÷ Speed (km/h)
The constant 1.60934 is the exact international definition of one statute mile in kilometres (since 1959). So at 10 km/h:
- Pace in min/km = 60 ÷ 10 = 6:00 min/km
- Pace in min/mile = 60 × 1.60934 ÷ 10 = 9:40 min/mile
The tool inverts this live — type a speed, get a pace instantly.
Calorie burn (ACSM formula)
The American College of Sports Medicine running metabolic equation estimates oxygen consumption:
VO₂ (mL/kg/min) = 0.2 × speed_m/min + 0.9 × speed_m/min × grade/100 + 3.5
where speed_m/min = km/h × 1000/60 and grade is the treadmill incline as a decimal percentage. Dividing VO₂ by 3.5 mL/kg/min gives METs (metabolic equivalents). Calories per minute follow:
kcal/min = MET × 3.5 × body_mass_kg ÷ 200
This is the standard formula used by exercise physiologists, cardiologists and fitness certification bodies worldwide.
Grade-adjusted flat-equivalent pace
Running at 1% incline already matches outdoor flat running (the Jones & Doust correction). For steeper grades, the tool applies the Jack Daniels grade adjustment: each additional 1% incline adds approximately 20 seconds per km (0.333 min/km) to flat-equivalent pace. This lets you meaningfully compare a hill-treadmill session to an outdoor race.
Worked example
You set the treadmill to 11 km/h at 2% incline, and your body weight is 75 kg.
| Metric | Value |
|---|---|
| Pace (min/km) | 5:27 |
| Pace (min/mile) | 8:47 |
| MET | ~11.9 |
| Calorie burn | ~9.3 kcal/min |
| Flat-equivalent pace | 5:47 min/km |
| 5 km projected finish | ~27:16 |
| Half marathon projected | ~1:55:27 |
The flat-equivalent pace is 20 s/km slower than the displayed pace because the 2% grade adds real cardiovascular work not shown in the speed readout.
Formula note
The 1.60934 km/mile conversion factor is the exact international standard. Treadmills in the UK, EU and most of Asia display km/h; North American treadmills typically show mph — both units yield identical results through this tool. The ACSM formula is validated for running speeds above approximately 5 km/h; at walking speeds (below ~5 km/h) a separate walking equation applies.
Frequently Asked Questions
See the structured FAQ below for quick answers about conversions, incline effects, calorie accuracy and race pacing.