Treadmill incline · weighted vest · rucking
What flat pace is your incline walk?
Enter a treadmill incline walk — plus a weighted vest or ruck if you carry one — and get the flat, unloaded pace that burns the same energy, with METs and calories. Uses the ACSM walking and Pandolf load-carriage equations, not the running math most tools misapply to walks.
Open the calculator ↗Your hill walk, translated to the flat
The level, unloaded speed that costs the same calories — honestly labelled walk or jog.
Unloaded walks use the ACSM walking equation, unlike grade-adjusted-pace tools that reuse running formulas.
Loads are modelled with the Pandolf load-carriage equation — rarely offered as a flat-pace equivalent anywhere.
Intensity and energy from the modelled oxygen cost (or watts for loaded walks) and your body weight.
The equations
VO₂ (mL·kg⁻¹·min⁻¹) = 3.5 + 0.1·speed + 1.8·speed·grade — ACSM metabolic equations, validated for treadmill walking ~50–100 m/min (1.9–3.7 mph).
VO₂ (mL·kg⁻¹·min⁻¹) = 3.5 + 0.2·speed + 0.9·speed·grade — used when the input is a run, not a walk.
Pandolf KB, Givoni B, Goldman RF (1977). Predicting energy expenditure with loads while standing or walking very slowly. J Appl Physiol 43(4):577–581.
Why it matters
Walking up an incline, or under load, can cost as much as a flat jog — but running formulas misjudge it. inclinepace uses the equations validated for walking and load carriage, with a disclosed method, and runs entirely client-side so nothing you enter is uploaded. Results are population-average estimates — not medical or training advice.
Frequently asked questions
What does inclinepace do?
You enter a treadmill (or hill) walk — speed, incline grade, and optionally a weighted vest or ruck load plus your body weight — and it tells you the flat, unloaded walking pace that costs the same energy, along with the METs and calories per minute. In short: it turns "3 mph at 10% with a 20 lb vest" into "feels like walking X mph on the flat". Everything runs in your browser.
Why not just use a normal incline-pace / grade-adjusted-pace calculator?
Most "grade adjusted pace" tools were built for RUNNING and apply running formulas to everything. Walking has a different metabolic cost curve, so running math overstates or understates the effort of an incline walk. inclinepace uses the ACSM WALKING equation for unloaded walks and the Pandolf load-carriage equation for vest/ruck work — the equations actually validated for walking and carrying load.
How does the weighted vest / rucking part work?
When you add a load, the energy cost is computed with the Pandolf, Givoni & Goldman (1977) equation — the long-standing military standard for the metabolic cost of walking under load. It accounts for body weight, the carried load, speed, and grade. Carried weight is more costly than the same speed and grade unloaded, which is why a rucked incline walk can equal a flat jog.
What does "equivalent flat pace" actually mean?
It is the speed at which walking on level ground with no load would burn the same calories per minute as your incline (and/or loaded) walk. If that energy cost is higher than any normal walk, the equivalent crosses into a jog/run, and the tool says so — that is the honest answer, not a made-up walking number.
What are METs and how are calories estimated?
A MET is a multiple of resting energy use (1 MET ≈ 3.5 mL O₂ per kg per minute). The tool converts the modelled oxygen cost (or watts, for loaded walks) into METs and into kcal/min using your body weight (kcal/min ≈ METs × 3.5 × kg ÷ 200). These are population-average estimates — your real numbers vary with fitness, efficiency, terrain, and conditions.
How accurate is it?
The equations are well-established but they are models of an average person. The ACSM walking equation is validated roughly 1.9–3.7 mph; above that it is flagged as a fast-walk gray zone. Pandolf can over-read at very light loads or very low speeds, and assumes firm ground (treadmill/pavement). Treat the output as a good estimate for planning, not a lab measurement.
Is this medical or training advice?
No. inclinepace is an informational fitness calculator. It does not know your health, injuries, or goals, and it is not a training plan or medical advice. Build up gradually, especially with added load, and talk to a qualified professional if you have any health concerns.
Is my data private?
Yes. This is a static page; every calculation happens in your browser. Your weight, speed, and load are never uploaded, there is no backend, and nothing is logged.