Grade Adjusted Pace Calculator

You're faster than you think. Convert your elevation gain into flat-equivalent speed.

Drop your GPX file here

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Frequently asked questions

What is Grade Adjusted Pace (GAP)?

GAP estimates the equivalent pace on flat land for a given effort on hilly terrain. Running uphill requires significantly more energy, so your "real" pace is faster than your watch shows.

How is GAP calculated?

We use the Minetti (2002) energy cost formula. Your GPX is analyzed segment by segment, calculating the gradient and applying an energy cost multiplier to produce a flat-equivalent distance.

Is my GPX file uploaded anywhere?

No. Your GPX file is processed entirely in your browser. Nothing is uploaded to any server.

How does this compare to Strava GAP?

Strava uses a proprietary formula. TrailSplits uses the published Minetti (2002) metabolic cost model, which accounts for both uphill and downhill energy costs, so the result is reproducible from the formula. It is a population model, not a measurement of your own physiology.