- aspect
- Tools
Calculators for runners & cyclists
Plan your pace, find your threshold, fine-tune your tyre pressure.
Pace calculator
Works out pace, time or distance and shows splits and a race time prediction.
Open RunningCritical speed calculator
Your running threshold and D′ from two or three all-out runs.
Open CyclingTyre pressure calculator
The right front and rear pressure for road, gravel and MTB.
OpenFrom calculator to training plan
Our training plans calculate every session from your values, week by week until your goal.
Go to training plans (opens in a new tab)- Pace, power and heart rate based on your thresholds
- Sessions sent to your watch via Garmin Connect or Intervals.icu
- Plans for running, cycling and triathlon, from beginner to advanced
Frequently asked questions
Are my entries stored?
No. Everything is calculated in your browser and your entries never leave your device. You do not need an account to use the calculators.
How accurate are the results?
The calculators use the same models as our coaching. They give you guide values, not lab results. How well the result fits depends mostly on what you enter. A properly run test is worth more than an estimated time.
Do the calculators work on a smartphone?
Yes. All calculators are built for phones, so you can use them at the track or just before the start.
How do I use the results in training?
aspect training plans calculate every session from your threshold values. Pace, power and heart rate then match your form, and you can send the sessions to your watch.