# What does treadmill incline add?

Computes the distance, elevation gain, oxygen cost, METs and calories of a treadmill walk or run at an incline with the ACSM metabolic equations, and the flat speed with the same effort.

- Page: https://www.acalculator.org/sports/treadmill-incline-calculator
- JSON spec: https://www.acalculator.org/sports/treadmill-incline-calculator.json
- Version: c98512977003

## Default answer

Example with the default inputs (Units US, Walking or running Walking, Speed (mph) 3, Incline (%) 10, Time (minutes) 30, Body weight (lb) 160): About 283 kcal and 792 of climb over 1.5.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| units | Units | US (mph, pounds, miles, feet) or metric (km/h, kilograms, kilometers, meters). |
| gait | Walking or running | Which ACSM equation to use: walking (up to about 3.7 mph) or running (above 5 mph). |
| v | Speed (mph) | The treadmill speed in miles per hour. |
| vk | Speed (km/h) | The treadmill speed in kilometers per hour. |
| g | Incline (%) | The treadmill grade in percent: rise per 100 units of belt travel. |
| t | Time (minutes) | How long you walk or run, in minutes. |
| wt | Body weight (lb) | Your body weight in pounds, for calories. |
| wtk | Body weight (kg) | Your body weight in kilograms, for calories. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| kcal | Calories | Total energy: kcal per minute × minutes. |
| gain | Elevation gain | Distance × grade, in feet (US) or meters (metric). |
| distance | Distance | Speed × time, in miles (US) or kilometers (metric). |
| vo2 | Oxygen cost (ml/kg/min) | The ACSM estimate of oxygen uptake. |
| mets | METs | Oxygen cost ÷ 3.5. |
| kcalMin | Calories per minute | Oxygen cost × body weight in kg ÷ 1,000 × 5 kcal per liter. |
| flat | Same effort on the flat | The speed at 0% incline with the same oxygen cost, in mph or km/h. |
| range | Equation range | Whether the speed is inside the range the chosen ACSM equation was built for. |

## Method

S = speed in m/min, G = incline ÷ 100. Walking VO2 = 0.1S + 1.8SG + 3.5; running VO2 = 0.2S + 0.9SG + 3.5. kcal/min = VO2 × kg ÷ 1,000 × 5.

## Assumptions

- The ACSM equations estimate the oxygen cost of steady treadmill exercise for an average adult; your own cost may differ.
- Elevation gain is belt distance × grade, as treadmill grade is defined.
- 5 kcal per liter of oxygen and 1 MET = 3.5 ml/kg/min.

## Worked examples

1. units = us, gait = walk, v = 3, g = 10, t = 30, wt = 160 gives kcal = 283, gain = 792, distance = 1.5, vo2 = 26, mets = 7.4, kcalMin = 9.45, flat = 8.4, range = Inside the equation’s range. Source: Moore CC et al., Development of a Cadence-Based Metabolic Equation for Walking, Med Sci Sports Exerc 2021;53(1):165–173 (ACSM walking equation VO2 = 0.1·speed + 1.8·speed·grade + 3.5; speed in m/min, grade as a decimal; most accurate at 1.9–3.7 mph), https://pmc.ncbi.nlm.nih.gov/articles/PMC7896743/; Compendium of Physical Activities, Unit conversions (1 MET = 3.5 ml/kg/min; L/min × 5 = kcal/min), https://pacompendium.com/unite-conversions/.
2. units = metric, gait = run, vk = 10, g = 2, t = 20, wtk = 70 gives vo2 = 39.8, kcalMin = 13.94, kcal = 279, gain = 67, flat = 10.9. Source: Koutlianos N et al., Indirect estimation of VO2max in athletes by ACSM’s equation: valid or not? Hippokratia 2013;17(2):136–140 (VO2 = 0.2·S + 0.9·S·G + 3.5; for speeds above 5.0 mph), https://pmc.ncbi.nlm.nih.gov/articles/PMC3743617/; Compendium of Physical Activities, Unit conversions (1 MET = 3.5 ml/kg/min; L/min × 5 = kcal/min), https://pacompendium.com/unite-conversions/.
3. units = us, gait = walk, v = 4.5, g = 0, t = 10, wt = 200 gives range = Outside the range: the walking equation is for 1.9 to 3.7 mph (3.06 to 5.95 km/h), gain = 0. Source: Moore CC et al., Development of a Cadence-Based Metabolic Equation for Walking, Med Sci Sports Exerc 2021;53(1):165–173 (ACSM walking equation VO2 = 0.1·speed + 1.8·speed·grade + 3.5; speed in m/min, grade as a decimal; most accurate at 1.9–3.7 mph), https://pmc.ncbi.nlm.nih.gov/articles/PMC7896743/ (most accurate at 1.9 to 3.7 mph).

## FAQ

### How many calories does walking on an incline burn?

Walking 3 mph at a 10% incline for 30 minutes costs about 283 kcal for a 160 lb person, by the ACSM walking equation. The same walk on the flat costs about 126 kcal, so the incline more than doubles it.

### How do I work out elevation gain on a treadmill?

Multiply the distance by the incline as a fraction. 1.5 miles at 10% is 1.5 × 5,280 × 0.10 = 792 feet of climb.

### What flat speed matches an incline walk?

The walking equation adds 1.8 × speed × grade to the oxygen cost, against 0.1 × speed for the flat. So each 1% of incline adds 18% to the flat speed with the same cost: 3 mph at 10% costs as much as 3 × (1 + 1.8) = 8.4 mph of flat walking. That pace is a run, so read it as the effort, not a pace to walk.

### Which equation should I use between 3.7 and 5 mph?

Neither was built for that band: the walking equation is most accurate from 1.9 to 3.7 mph and the running equation is for speeds above 5 mph. Pick the one that matches what you are doing (walking or jogging); the page says when a speed is outside the range.

### How accurate are the calories?

They are estimates for an average adult on a treadmill, without holding the handrails. Koutlianos and others (2013) found the running equation overestimated the oxygen cost of trained athletes, so use the numbers to compare workouts rather than as an exact count.

## Sources

- Moore CC, Aguiar EJ, Ducharme SW and others. Development of a Cadence-Based Metabolic Equation for Walking. Med Sci Sports Exerc. 2021;53(1):165–173 (the ACSM walking equation, VO2 = 0.1·speed + 1.8·speed·grade + 3.5, speed in m/min, grade as a decimal, most accurate at 1.9–3.7 mph). https://pmc.ncbi.nlm.nih.gov/articles/PMC7896743/ (retrieved 2026-10-19)
- Koutlianos N, Dimitros E, Metaxas T and others. Indirect estimation of VO2max in athletes by ACSM’s equation: valid or not? Hippokratia. 2013;17(2):136–140 (ACSM running equation VO2 = 0.2·S + 0.9·S·G + 3.5, designed for speeds above 5.0 mph). https://pmc.ncbi.nlm.nih.gov/articles/PMC3743617/ (retrieved 2026-10-19)
- Compendium of Physical Activities, Unit conversions (1 MET = 3.5 ml/kg/min; liters of oxygen per minute × 5 = kcal per minute). https://pacompendium.com/unite-conversions/ (retrieved 2026-10-19)
- NIST Special Publication 811 (2008), Appendix B.8: 1 mi = 1,609.344 m, 1 ft = 0.3048 m and 1 lb = 0.45359237 kg exactly. https://www.nist.gov/pml/special-publication-811 (retrieved 2026-10-19)