Free Running Calculators
Every calculator a runner needs. Free forever, no signup required. Instant real-time results.
Pace Calculator
Calculate your running pace, speed, and finish time for any distance.
Race Time Predictor
Predict your finish time at any race distance from a recent result.
Split Time Calculator
Plan your race splits with even or negative split strategies.
Training Paces
Get your easy, tempo, interval and repetition training paces.
Speed / Pace Converter
Convert between min/km, min/mile, km/h, mph and m/s.
Age-Graded Calculator
Compare your performance across ages and genders.
VO2max Estimator
Estimate your VO2max from a race result. See your fitness level.
Heart Rate Zones
Calculate your 5 HR training zones using the Karvonen method.
Calories Burned
Estimate calories burned running based on weight, distance and pace.
Treadmill Converter
Convert treadmill speed and incline to outdoor equivalent pace.
Negative Split Planner
Plan a negative split strategy for a strong race finish.
Run/Walk Calculator
Calculate total time with run/walk intervals. Galloway method.