Free Tools
Free Running Calculators
Pace math, VDOT training zones, race predictions, and split planning — all free in your browser. No account needed.
VDOT
VDOT Calculator
Enter any race result to get your VDOT score and five training zone paces.
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Pace
Pace Calculator
Solve for pace, time, or distance. Enter any two fields and get the third.
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Predict
Race Time Predictor
Enter a recent race result and predict your finish time at any distance.
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Plan
Race Split Planner
Generate a mile-by-mile or km-by-km split plan for your target race time.
Plan →
HRmax
Max Heart Rate Calculator
Estimate your max heart rate using Tanaka, Nes, and Gulati formulas.
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HR Zones
Heart Rate Zones Calculator
Five training zones using Karvonen or %HRmax — Z1 through Z5 in bpm.
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Calories
Running Calorie Calculator
Calories burned running, ACSM equation, with incline support.
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Treadmill
Treadmill Pace Converter
Convert mph/kph and incline to outdoor-equivalent pace.
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VO₂ max
VO2 Max Calculator
Estimate VO2 max from a race result, Cooper test, or heart rate.
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Steps
Steps to Miles Calculator
Convert steps to miles and km, walking or running, with your height.
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Run/Walk
Run/Walk Pace Calculator
Combined pace and finish times for the Galloway run/walk method.
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Split
Negative Split Calculator
Plan a faster second half with per-half paces and a split table.
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