Running Pace Calculator

To finish a 5K in under 30 minutes, average faster than 9:39 per mile (6:00 per km). A moderate-to-brisk pace for most recreational runners.

Most beginners who can already run 30 minutes continuously can hit a sub-30 5K with a few months of focused training. Aim for even splits.

A sub-2-hour half requires averaging 9:09 per mile (5:41 per km). Popular milestone goal for intermediate runners.

Most training plans need at least 3 months of consistent running building up to a long run of 10-12 miles. Aim for negative splits.

A sub-4 marathon requires averaging 9:09 per mile (5:41 per km), the same pace as a sub-2-hour half, sustained twice as long.

Most runners need 16 to 20 weeks of focused training. Weekly mileage typically 30 to 50 miles, long run 18 to 22 miles. Challenge is endurance, not raw speed.

Most accurate when scaling between distances of similar magnitude. 10K from 5K is very accurate; half marathon from 10K usually is too.

5K to marathon often overestimates for runners with low weekly mileage. Under-trained runners often run 10-20 minutes slower than predicted. Use it as a ceiling.

Multiply min/mile by 0.621 to get min/km, or divide by 1.609. So 9:00 per mile is (9 × 0.621) = 5:36 per km.

Multiply min/km by 1.609 to reverse. Use the Pace Conversion table for instant lookup.

Divide 60 by your speed in mph. At 6.0 mph, pace is 60/6 = 10:00 per mile. At 8.0 mph, 60/8 = 7:30 per mile.

The Treadmill Pace Conversion table shows common values from 4.0 to 12.0 mph already converted.

A fit beginner: 30-35 min. Regular recreational runner: 25-28 min. Competitive amateur: 18-22 min. Sub-18 is national-class amateur.

Age affects times mostly after 40. Elite runners lose roughly 0.5% per year of speed after 35.

Split times are intermediate checkpoints. Divide goal time by total distance, multiply by split number.

For a 4:00:00 marathon: pace = 4:00:00 / 26.22 = 9:09 per mile. Mile 1 = 9:09. Mile 5 = 45:45. Mile 13 = 1:58:57.

Average pace is your total time divided by total distance. Your overall pace for the run so far. Current pace is your speed at this exact moment. GPS watches show both.

Current pace fluctuates with hills and effort; average pace is smoother. Race plans target splits rather than current pace.

Treadmill running typically feels slightly easier at the same displayed speed due to reduced wind resistance and the moving belt.

To approximate outdoor effort, many coaches recommend setting treadmill incline to 1%. At paces faster than 7:30 per mile, this correction matters less.

Most runners slow down by 12 to 20 seconds per mile per 1% grade uphill. Going downhill, you typically gain back about 8 to 14 seconds per mile per 1% grade (less than you lost going up).

Net: hilly courses run 5 to 10% slower than flat courses for the same effort.

GPS measures distance with ±2 to 5% inaccuracy depending on satellite reception, tree cover, urban canyons, and watch model.

Over a marathon, GPS often reads slightly long (you'll see 26.4 to 26.6 miles for an actual 26.22-mile course). Makes your displayed average pace slightly faster than your true race pace.