Calciro

Running Pace Calculator: Pace, Speed & Race Time Converter

Calculate running pace (min/mile or min/km), convert between pace and speed, and project finish times for any race distance. Covers how to train at correct paces for each zone.

Related Calculators

The Three Pace Calculations

Pace from distance and time: Pace (min/mile) = Total Time (minutes) ÷ Distance (miles)

Total time from pace and distance: Time = Pace × Distance

Speed from pace: Speed (mph) = 60 ÷ Pace (min/mile)

Worked Examples

Example 1: You run a 5K in 28:30 (28 minutes, 30 seconds = 28.5 minutes) - 5K = 3.107 miles - Pace = 28.5 ÷ 3.107 = 9:10 per mile (or 5:42 per km) - Speed = 60 ÷ 9.17 = 6.5 mph

Example 2: You want to run a sub-4:00 marathon - Marathon = 26.219 miles - Required pace: 240 minutes ÷ 26.219 = 9:09 per mile (5:41/km)

Pace-to-Speed Conversion Table

Pace (min/mile)Speed (mph)Pace (min/km)
6:0010.03:44
7:008.64:21
8:007.54:58
9:006.75:35
10:006.06:13
12:005.07:27

Race Finish Time Projections

Pace5K10KHalf MarathonMarathon
7:00/mi21:4543:301:31:403:03:22
8:00/mi24:5149:421:44:563:29:51
9:00/mi27:5855:551:58:113:56:22
10:00/mi31:041:02:082:11:274:22:53
12:00/mi37:171:14:342:37:445:15:46

Training Paces by Zone

Most training runs should NOT be at race pace. Effective endurance training uses different pace zones:

ZoneEffortPace Relative to 10K PaceTraining Effect
Easy run60–70% effort1:30–2:00/mile slowerAerobic base, recovery
Long run65–75%1:00–1:45/mile slowerEndurance adaptation
Tempo85–90%~10–20 sec/mile slowerLactate threshold
10K race pace~90%Race effortVO2max
5K race pace~95%Harder than 10KSpeed-endurance
Interval (400m)95–100%Faster than 5KVO2max, speed

Example: A runner with a 10K pace of 8:30/mile should run: - Easy runs: 10:00–10:30/mile - Long runs: 9:30–10:15/mile - Tempo runs: 8:45–9:00/mile

Adjusting for Heat and Altitude

Heat (above 60°F/15°C): Add approximately 10–30 seconds/mile per 10°F increase above 60°F. A 9:00 pace at 60°F becomes ~9:30 at 80°F.

Altitude (above 5,000 ft / 1,500 m): Expect 1.5–3% slower pace per 1,000 ft gain above sea level. At 8,000 ft (Denver area), paces are 4–6% slower than sea level until acclimated (1–3 weeks of acclimatization).

Related Guides

Frequently Asked Questions

How do I calculate my running pace?
Pace (min/mile) = Total Time in Minutes ÷ Distance in Miles. Example: 45 minutes for 5 miles = 9:00 per mile. For min/km: divide total minutes by distance in km. Convert seconds to decimal (30 sec = 0.5 min) before dividing.
What is a good running pace for a beginner?
A comfortable conversational pace varies by fitness level. Most beginners are comfortable at 10–14 min/mile. 'Good' pace is relative — focusing on effort level (able to speak in full sentences) matters more than a specific speed. A 12:00 mile run consistently is far better than no running at all.
How do I convert running pace to miles per hour?
mph = 60 ÷ pace in min/mile. A 9:00/mile pace = 60 ÷ 9 = 6.67 mph. An 8:00/mile pace = 7.5 mph. A 6:00/mile pace = 10 mph.
What pace should I train at to improve?
Most training runs (70–80% of volume) should be at an easy pace — conversational, about 1–2 minutes per mile slower than your 10K race pace. Going too fast on easy days is the most common training mistake. Reserve hard effort for structured workouts (tempo, intervals) 1–2 times per week.
How do I calculate my marathon pace?
Marathon pace (min/mile) = Target finish time (minutes) ÷ 26.219 miles. For a 4:00 marathon: 240 ÷ 26.219 = 9:09/mile. For a 3:30 marathon: 210 ÷ 26.219 = 8:01/mile. Train your long runs at a pace 1–2 min/mile slower than goal marathon pace.

Last updated 7/28/2026