Running Pace Calculator: How to Find Your Target Pace for Any Race Distance

Pace is the single most useful number in running training. It connects your fitness level to your race goals, tells you how hard to push in each workout, and lets you project finish times with reasonable accuracy. Once you understand how to calculate it and use it, it becomes the foundation of all your training decisions.

Our pace calculator converts between pace, speed, distance, and time in any combination. This guide covers the formulas and how to apply them to real training.

The basic pace formula

Pace is expressed as time per unit distance — minutes per mile in the US, minutes per kilometer elsewhere.

Pace = Total Time / Distance

You need to express both in consistent units. If you ran 3.1 miles (a 5K) in 27:30:

Pace = 27.5 minutes / 3.1 miles = 8:52 per mile

To convert pace to speed in mph:

Speed (mph) = 60 / Pace (min/mile)

8:52 min/mile = 60 / 8.867 = 6.77 mph

Standard race distances

Race	Distance (miles)	Distance (km)
1 mile	1.00	1.609
5K	3.107	5.000
10K	6.214	10.000
Half marathon	13.109	21.097
Marathon	26.219	42.195

Calculating finish time from pace

Finish time = Pace x Distance

Example: 10K at 9:30/mile pace

Finish time = 9.5 minutes x 6.214 miles = 59.03 minutes = 59:02

Example: half marathon at 10:00/mile pace

Finish time = 10 minutes x 13.109 miles = 131.09 minutes = 2:11:05

Calculating required pace from a finish time goal

Required pace = Goal time / Distance

Example: Sub-4 hour marathon

4 hours = 240 minutes. Distance = 26.219 miles.

Required pace = 240 / 26.219 = 9.154 min/mile = 9:09 per mile

Example: Sub-30 minute 5K

Required pace = 30 / 3.107 = 9.657 min/mile = 9:39 per mile

Training pace zones

Not every run should be at race pace. Effective training uses multiple effort levels. A common framework based on heart rate and perceived exertion:

Zone	Effort	% of max HR	Purpose	Typical pace vs 5K race
Zone 1	Very easy	50-60%	Recovery, warm-up	2+ min/mile slower
Zone 2	Easy (aerobic)	60-70%	Aerobic base, long runs	90-120 sec/mile slower
Zone 3	Moderate (tempo)	70-80%	Lactate threshold	20-40 sec/mile slower
Zone 4	Hard	80-90%	Race pace, intervals	At or near race pace
Zone 5	Maximum	90-100%	VO2 max, short intervals	Faster than race pace

Most training should be Zone 1-2. The "80/20 rule" in endurance training — popularized by researcher Stephen Seiler — suggests elite athletes spend roughly 80% of training time at low intensity and 20% at high intensity. Going hard every day leads to stagnation and injury, not improvement.

Predicting race times from current fitness

A rough but useful formula for predicting performance across distances uses the "race equivalency" relationship. Pete Riegel's formula:

T2 = T1 x (D2/D1)^1.06

Where T1 is your time at distance D1, and you want to predict T2 at distance D2.

Example: Predict marathon from 5K

5K time: 25:00 (1,500 seconds). Marathon = 26.219 miles = 8.443 x 5K distance.

T2 = 1500 x (8.443)^1.06 = 1500 x 9.32 = 13,984 seconds = 3:53:04

This assumes equal training and conditions, which rarely holds for longer distances. Add 5-10% for most amateur runners moving from shorter to longer distances due to fatigue.

Pace conversion: min/mile to min/km

Min/mile	Min/km	mph	km/h
6:00	3:44	10.0	16.1
7:00	4:21	8.6	13.8
8:00	4:58	7.5	12.1
9:00	5:36	6.7	10.7
10:00	6:12	6.0	9.7
12:00	7:27	5.0	8.0

Use the pace calculator to convert between any combination of pace, speed, distance, and time — including calculating splits for even or negative split race strategies.