Running Pace Basics: From Finish Time to Clear Pace Math
A running pace worksheet is arithmetic on one known performance: distance and clock time become average pace and speed. Optionally, Riegel’s rule of thumb projects another distance. This guide is educational only—not a VO2max test, heat model, or coaching prescription.
What Pace Math Actually Answers
The useful question is 'What average pace and speed does this finish imply?' Projection asks a second question: 'If a simple endurance scaling law applies, what finish might another distance suggest?' Hills, heat, and fitness still change race day.
How the Worksheet Orders the Math
Enter distance in kilometers
Convert miles × 1.60934 first if needed.
Enter finish time
Hours, minutes, and seconds for the same effort.
Read pace and speed
Pace = total seconds ÷ km; speed = km ÷ hours.
Optionally project another distance
T2 = T1 × (D2/D1)^exponent with a typical recreational default of 1.06.
Run the Pace Worksheet
Convert a finish into pace and optional race projection:
Open Running Pace CalculatorWorked Scenario
A 50-minute 10K is 3000 seconds over 10 km → 5:00 /km and 12 km/h. Projecting to a half marathon (21.0975 km) with exponent 1.06 yields about 6619 seconds (roughly 1:50:19) and about 5:14 /km—an estimate, not a guarantee.
Bottom Line
Pace basics make finish times readable. Keep projections humble, convert units carefully, and treat coaching and medical advice as separate from arithmetic.