Hiking Time Calculator (Naismith)

Estimate hiking time from distance and elevation using Naismith's rule with a Langmuir descent correction.

Preparing a race: the pace a target time needs, the splits to hold it, and the training zones that sit under it — on foot, and equally on a bike or in a pool, where the same session is measured in watts or in a hundred-metre split instead.

Scaling a time linearly to a longer distance. A marathon is not two half-marathons; race predictors use an exponent around 1.06 precisely because fatigue is not proportional.

They sit next to each other but answer different questions: Pace to finish time calculator is the one to open when you need it to turn your running pace and a race distance into an expected finish time. Pick whichever matches what you're starting from — both are free.

Race time predictor is the closest one after this: Predict your finish time over a new distance from a recent race result (Riegel formula).

Walking time calculator and Backpacking Food Weight Calculator — they come up in the same task often enough to be worth a second tab.

Pace arithmetic is exact. Race predictions follow Riegel's formula, which assumes training matched to the longer distance — without it the prediction is optimistic.