Goal Pace Calculator for a Running Target
Written by Thierno Sadou Diallo, formula verified per our methodology • Last checked on 9/10/2026
Goal pace is calculated with target time ÷ distance. For a marathon (42.195 km) targeted in 3:30, you need to hold a pace of 4:59 per km, about 12.06 km/h.
Explanation
Preparing for a race with a precise target time means knowing the exact pace to hold for each kilometer, a figure this calculator derives directly from the target time and the distance. Unlike the running pace calculator, which measures the actual pace of an already-completed run, or the race time prediction calculator, which estimates a likely time from a past performance via the Riegel formula, this calculator starts from a freely chosen goal — a "round" time like 3 hours for a marathon, or a personal record to beat — to produce the reference pace to memorize before the start. The resulting pace is an average: in an actual race, the strategy recommended by most coaches is to run the first kilometers slightly slower than this average pace, then gradually speed up (the "negative split"), rather than starting exactly at goal pace from the first kilometer, which risks a marked slowdown late in the race. The average speed in km/h is also shown, useful for setting a treadmill or checking the goal's consistency with your maximal aerobic speed.
Example: a marathon in 3:30
Inputs
Distance: 42.195 km. Target time: 3 h 30 min.
Calculation
Total time = 3 × 3600 + 30 × 60 = 12,600 s. Pace = 12,600 ÷ 42.195 ≈ 298.6 s/km, rounded to 299 s, or 4:59 per km. Speed = 42.195 ÷ 3.5 ≈ 12.06 km/h.
Result
To target 3:30 in the marathon, you need to hold an average pace of 4:59 per km.
Frequently asked questions
Should I run exactly at this pace from the first kilometer?
No, this pace is an average over the whole distance: most coaches recommend starting 5 to 10 seconds per km slower than goal pace over the first kilometers, then gradually speeding up to finish faster than the average ("negative split"). Starting exactly at goal pace from the gun, or faster, is the most common mistake and risks a significant slowdown late in the race.
How do I know if my goal is realistic?
Compare the resulting average speed to your maximal aerobic speed (MAS): over a 10K, a trained runner holds about 85 to 90% of MAS; over a half-marathon, about 80 to 85%; over a marathon, about 75 to 80%. Our race time prediction calculator also estimates a likely time from a recent performance over another distance.
Does this calculation account for the course elevation?
No, the calculated pace assumes a flat course: on a hilly course, the actual pace must be adjusted uphill (slower) and downhill (faster) to maintain a constant effort, with the average pace over the whole course remaining the goal. Total elevation gain can also be converted into an equivalent effort-distance to adjust the overall time goal.