Grade changes demand
Treadmill Incline Calculator
Compare the formula's estimated oxygen demand at different treadmill grades without treating incline as a universal road or race equivalent.
Incline intensity
Calculate your treadmill session
Values stay in your browser and are never sent to us.
Enter your session and choose Calculate to see results.
How it works
Enter belt speed and the machine's incline percentage, then select Walking or Running. The calculator expresses grade as a decimal and applies it to the selected ACSM equation.
Formula
Running VO₂ = 0.2 × speed + 0.9 × speed × grade + 3.5. Walking uses 0.1 and 1.8 coefficients. Speed is meters per minute and grade is incline ÷ 100.
Example
At the same 8 km/h speed, changing incline from 1% to 5% increases the estimated oxygen demand, while pace and belt distance remain unchanged.
FAQ
Is 1% incline always equal to outdoor running?
No. Wind, surface, temperature, machine calibration, and the runner all matter. This page compares equation inputs; it does not prescribe a training grade.