Pace Calculator

About the Pace Calculator

Whether you are training for your first 5K or targeting a Boston Marathon qualifying time, understanding your running pace — the time it takes to cover one mile or kilometre — is fundamental to race planning, workout structuring, and progress tracking. Our pace calculator works in all three directions: give it any two of pace, time, and distance to instantly calculate the third.

How It Works

Pace = Time ÷ Distance. Time = Pace × Distance. Distance = Time ÷ Pace. To convert between min/km and min/mile: multiply min/km by 1.60934 to get min/mile. Conversely, divide min/mile by 1.60934 for min/km. For race projections, our calculator uses the Riegel formula: predicted time = T₁ × (D₂/D₁)^1.06, which accounts for the energy cost increase at longer distances.

Tips & Best Practices

• ✓A 10-minute mile (6:12/km) is a comfortable recreational pace; sub-8 min/mile is considered competitive.
• ✓Boston Marathon qualifying times range from 3:00 (men under 35) to 5:20 (women 80+).
• ✓Easy runs should be at 60-70% of max heart rate — most runners run their easy days too fast.
• ✓Tempo pace is approximately race pace plus 25-30 seconds per mile for most runners.
• ✓The 10% rule: increase weekly mileage by no more than 10% per week to avoid overuse injuries.

Who Uses This Calculator

Runners planning race-day pacing strategies, coaches building training plans with specific pace zones, cyclists converting cycling power to equivalent running pace, and triathletes calculating transition times all use pace calculators constantly.