Pace Calculator

How it works

Pace = time ÷ distance
Time = pace × distance
Distance = time ÷ pace

We convert everything to seconds, solve, then format as minutes:seconds. 1 mile = 1.609344 km.

Common race distances

Using pace in training

Most training is best done at an easy, conversational pace, typically 1–2 minutes per mile slower than 5K race pace. Hills, heat, altitude and wind slow you down, so judge effort as well as the watch. If you're new to running, build up gradually and check with a doctor if you have heart, lung or joint conditions.

Pace charts for common goals

Even pacing is usually the fastest way to race. These are the per-mile and per-kilometer paces needed for popular finish times:

Pace, speed and treadmills

Treadmills usually show speed (mph or km/h) rather than pace. To convert, divide 60 by your speed: 6 mph is a 10:00 mile, 7.5 mph is an 8:00 mile, and 12 km/h is 5:00 per km. Many runners set a 1% incline to better match the effort of running outdoors, where you also push against air resistance.

Splits and race strategy

A "split" is the time for one segment of a race, such as each mile. Going out too fast is the most common pacing mistake: the first mile feels easy on fresh legs and adrenaline, but every second banked early tends to cost more later. Experienced runners often aim for even splits or a slightly faster second half (a "negative split"). Use the finish-time mode to see what pace you need, then plan to run the first mile or two 5–10 seconds per mile slower than that.

Adjusting for conditions

Heat and humidity raise heart rate and sweat loss, so the same pace becomes harder; many coaches slow goal pace by several seconds per mile in warm weather. Hills, trails, wind and altitude also slow you down. On those days, run by effort — breathing and perceived exertion — and treat the watch as information, not a target.

Training paces at a glance

• Easy runs: conversational effort; most of your weekly mileage.
• Long runs: usually at or slightly slower than easy pace.
• Tempo runs: "comfortably hard," roughly the pace you could hold for about an hour.
• Intervals: short repeats at around 5K pace or faster, with recovery jogs.

Pair pace with our Heart Rate Zone Calculator to keep easy days genuinely easy.

Age-graded and beginner goals

Comparing yourself with elite times isn't helpful. For a first race, simply finishing at a steady effort is a great goal; for later races, aim to improve on your own previous time by a few percent. A walk-run approach (for example, 4 minutes running and 1 minute walking) is a proven way for beginners to complete longer distances comfortably.

Recovery between hard runs

Allow at least 48 hours between hard interval or tempo sessions, and keep runs in between genuinely easy.

Worked examples

Example 1: 5K in 25:30

25:30 = 1,530 s; 3.107 mi. Pace = 1,530 ÷ 3.107 ≈ 492 s = 8:12 per mile (5:06 per km).

Example 2: Marathon at 9:00/mile

540 s × 26.219 mi ≈ 14,158 s = 3:55:58.

Example 3: One hour at 5:00/km

3,600 ÷ 300 = 12.00 km (7.46 mi).

Limitations

• Assumes an even pace; courses, weather and fatigue vary.
• GPS watches often measure slightly long or short.

Who should not rely on this calculator

The math works for anyone, but if you have a heart condition, are pregnant, or are returning from injury, get medical clearance before training hard.