Running calculator
Treadmill pace calculator
Turn the number on the treadmill into a pace you recognise — km/h or mph into min/km and min/mile — and see what your incline is really worth on flat road. Free, instant, no sign-up.
At 1% incline, 10 km/h on the belt costs what 10.5 km/h would cost on level ground.
Treadmill sessions count — the coach folds them into the same weekly plan as outdoor runs.
Why treadmill pace feels different
A treadmill console reports speed, not pace, and the belt does part of the work for you: no wind, no surface variation, no hills unless you dial them in. That's why the number that felt hard indoors can look modest once it's converted into min/km — and why an incline changes the effort without changing the pace shown on the display.
How this calculator works
Pace is straight arithmetic — 60 ÷ speed in km/h gives minutes per kilometre. For incline we use the ACSM running metabolic equation, VO2 = 0.2·S + 0.9·S·G + 3.5, where S is metres per minute and G is the grade as a fraction. Solving for the flat speed with the same oxygen cost gives S_flat = S × (1 + 4.5·G): every 1% of incline is worth about 4.5% more speed. The equation is validated for running speeds, so treat walking numbers as a rough guide.
Setting the incline
The common advice to run at 1% comes from Jones & Doust (1996), who found that a 1% grade makes treadmill running match the energy cost of running outdoors at 10.5 km/h and faster, where air resistance starts to bite. Steeper settings are a training tool in their own right: 5–8% turns an easy pace into a threshold effort with far less impact than running that hard on flat ground.