Elevation Adjusted Pace Calculator

Grade Adjusted Pace is a flat-run equivalent pace calculated from a pace performed over a gradient. It converts your hilly running pace into the effort-equivalent pace you would expect on completely flat ground. This lets you meaningfully compare runs with different elevation profiles and evaluate true running effort regardless of terrain.

The calculator first computes the slope grade as (rise / horizontal run) × 100. It then applies a scientifically-derived effort multiplier based on peer-reviewed research into the energetic cost of uphill and downhill running. Your actual pace is divided by this multiplier to produce the flat-equivalent GAP.

Yes. Uphills increase the energetic cost of running, so your GAP will be faster than your actual pace — reflecting the extra effort. Downhills reduce cost up to a point, making your GAP slower than actual pace. Very steep downhills (over ~20% grade) can increase effort again due to braking forces, which is also accounted for in the model.

Absolutely — this is one of the most practical uses of GAP. If you ran a hilly segment at a pace that calculates to a 8:00/mile GAP, you can expect a similar effort to produce roughly that pace on a flat course. Keep in mind that individual hill running efficiency varies and GAP is an estimate, not a guarantee.

Generally yes, because uphill running requires lifting body mass against gravity. The energetic cost of uphill running scales with body weight, while flat-ground running economy is relatively less affected by weight. The standard GAP formula used here does not incorporate body weight, so heavier runners may find the adjustment slightly underestimates their hill effort.

Road races rarely exceed 5–8% grade on major climbs. Trail and mountain runs can see grades of 15–30% or more on steep sections. A 5% grade means 5 metres of rise for every 100 metres of horizontal distance, which is noticeable but runnable for most trained athletes.

GAP is a research-based estimate derived from studies on the energetics of running at different gradients. It works best for moderate grades (roughly -20% to +35%). Very extreme gradients may fall outside the validated range of the underlying model, and individual factors like fitness, terrain surface, and running form also play a role.

Grade is expressed as a percentage: rise divided by horizontal run, multiplied by 100. Slope angle is the arctangent of (grade / 100), expressed in degrees. A 10% grade equals approximately 5.7°. Both describe the same steepness; grade is the standard used in running and cycling while degrees are more common in geometry.