Fitness calculator hub
Running & Endurance Calculators
Pace, distance and time are closely connected, which makes a small set of running tools especially useful for planning a session or reviewing a race. Use these calculators to convert a target time into a pace, create even or negative splits and understand how a recent effort may translate to another distance.
Explore Running & Endurance Calculators
6 free toolsRunning Pace Calculator
Calculate your running pace, speed and projected race finish times.
Heart Rate Zone Calculator
Find your 5 heart rate training zones for fat burn, aerobic and max effort.
HYROX Race Time Calculator
Estimate your HYROX finish time from run pace, station splits and Roxzone transitions.
Steps to Distance Calculator
Convert your daily step count to walking distance in km or miles.
Running Calorie Calculator
Calculate calories burned during a run based on pace, duration and weight.
VO₂ Max Calculator
Estimate your cardiovascular fitness and VO₂ Max using standard fitness tests.
How to use these tools well
A predicted time is a planning range
Race-time and pace predictions use the information available to them, usually a previous result and a target distance. They do not know the course, weather, terrain, fuelling, injury history or how specific your training has been. Use a prediction to choose sensible targets, then adjust on the day using effort and conditions.
Keep easy days genuinely easy
Heart-rate zones, cadence and pace can provide useful guardrails, but no single metric is perfect for every runner. Heat, hills, fatigue and sensor accuracy can all alter the numbers. Combining pace with perceived effort and a gradual training progression is generally more practical than forcing every run into one exact target.
Link the run to the rest of your training
For longer events, use the marathon-fuel, water and carbohydrate tools alongside pacing calculations. For HYROX or mixed conditioning, include station splits and transition time rather than treating the running pace in isolation. Seek medical assessment for chest pain, unexplained breathlessness, fainting or other concerning symptoms during exercise.