# How to calculate calories burned while running [duplicate]

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I am developing an app for running and I can't find precise formulas for calories burned while running. I need a various formulas based on gender, age, height, weight, distance, time and so on. Any accurate formulas would be a great help for me.

## marked as duplicate by arober11, Eric♦, Alec♦, rrirower, JohnP♦Jul 6 '15 at 15:49

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## 1 Answer

There aren't any accurate equations, without data from an ECG and face mask based gas analyzers.

The best you can do without a true heart rate and O2 measures is to estimate a VO2max figure, and convert that into a Kcal one:

Kcal/Min ~= 5 calories * massKg * VO2 / 1000

The ACMS Running VO2max equation will give a number that's accurate within: +/-14.5% and the conversion to Kcal will multiply the error by a bit.

VO2 = 0.2 (speed) + 0.9 (speed)(fractional grade) + 3.5

• In addition, there are numerous charts around on the internet for running varied by pace and weight. Take the average of a bunch of them and call it good. – JohnP May 10 '15 at 18:57