Pace vs speed - what's the difference?

Same physics, inverted convention. Speed is distance per time (e.g. 10 km/h); pace is time per distance (e.g. 6:00 / km). Runners talk in pace because it makes split times trivial - to run a marathon in 4 hours you need a pace of 5:41 / km, and 5:41 is the same number you'll see on the watch every kilometre.

Does it account for elevation?

No. Pace calculations are flat-ground only. Real-world pace on a hilly course can be 30 seconds per km slower than the flat equivalent; experienced runners adjust on the fly.

Calculadora de ritmo

Ritmo, distancia, tiempo - da dos, calculamos el tercero. Splits en km y millas.

Funciona en tu navegador

Rellena dos de tres campos - ritmo, distancia, tiempo - calculamos el tercero. Ritmo en min/km y min/mi. Splits 5K, 10K, media, maratón debajo.

Unidad de distancia

Calcular

Distancia (km)

Tiempo (HH:MM:SS)

Ritmo (min:seg / unidad)

Distancia

10.00 km

Tiempo

00:50:00

Ritmo / km

5:00 / km

Ritmo / mi

8:03 / mi

Splits a este ritmo

5K00:25:00
10K00:50:00
Half01:45:29
Marathon03:30:59

Cómo usarla

Pick what to solve for
Pace, time, or distance - the field with the spinner becomes the output.
Fill the other two
Pace as min:sec / km, time as HH:MM:SS, distance in km or mi (toggle units).
Read splits
Per-kilometre and per-mile splits for 5K, 10K, half, marathon are shown below.

¿Qué es?

A pace calculator solves the three-variable triangle of distance, time and pace. With any two known, the third is one division away. The interesting parts are formatting (min:sec / km is the runner's standard, not decimal minutes), units (km / mi side-by-side because most races still publish in mi internally), and the per-distance split tables.

Cuándo usarla

Planning a race day: 'I want to break four hours on the marathon - what pace do I need?'. Working backwards from a training run: '8 km in 41:36, what was my pace?'. Comparing two efforts on different distances: 'is today's 5K at 4:20 / km faster or slower than last week's 10K at 4:40 / km?'.

Errores comunes

Confusing decimal minutes (1.5 min) with min:sec (1:30 min); the calculator accepts both formats but it's easy to typo. Targeting a pace that's faster than your race pace by accident - 4:00 / km looks similar to 4:30 / km but the time difference at marathon distance is huge (2:48 vs 3:09). And forgetting that 'easy pace' for endurance runs is 60-90 seconds per km slower than race pace.

Preguntas frecuentes

Pace vs speed - what's the difference?: Same physics, inverted convention. Speed is distance per time (e.g. 10 km/h); pace is time per distance (e.g. 6:00 / km). Runners talk in pace because it makes split times trivial - to run a marathon in 4 hours you need a pace of 5:41 / km, and 5:41 is the same number you'll see on the watch every kilometre.
Does it account for elevation?: No. Pace calculations are flat-ground only. Real-world pace on a hilly course can be 30 seconds per km slower than the flat equivalent; experienced runners adjust on the fly.

Conversor de unidades

Convierte longitud, peso, temperatura, volumen y más.

Calculadora de duración

Cuántas horas, minutos o segundos entre dos horas - o dos fechas completas - en tu navegador.

Calculadora de IMC

Calcula tu Índice de Masa Corporal en métrico o imperial.