Free running calculators
Six practical tools for pace, race-time predictions, splits, run/walk intervals, cadence, and treadmill speed.
Browse calculatorsABOUT CALCSTUDIO
Running tools that make the numbers easier to understand.
CalcStudio brings together free running calculators, practical training sessions, and clear educational guides in one place. Our goal is to help runners make sense of pace, distance, time, and training choices without unnecessary complexity.
WHAT YOU'LL FIND HERE
Tools to calculate, learn, and plan
Whether you're getting ready for your first 5K, comparing race paces, or organizing a week of running, CalcStudio is designed to offer a useful starting point. The tools are free to use and don't require an account.
Step-by-step tool tutorials
Instructions, examples, and explanations to help you understand how to use each calculator.
Explore tutorialsReady-to-use running sessions
A workout library with warm-ups, main sets, cooldowns, and coaching notes for a range of abilities.
Find a sessionA flexible weekly planner
Create and adapt a seven-day schedule around your experience, goal, and available training days.
Open the plannerRUNNING KNOWLEDGE
Guides for real-world training questions
Our running blog covers 5K, 10K, half-marathon, and marathon topics. These articles are separate from the tool tutorials: blog guides discuss training decisions, while tool tutorials explain how to use CalcStudio's calculators.
Explore running guidesOUR APPROACH
Clear calculations. Useful context. No unrealistic promises.
Understandable results
We aim to explain what a calculation means and, where relevant, show the formula or assumptions behind it.
Flexible training information
Example sessions and plans are starting points that can be adjusted for fitness, experience, recovery, and individual circumstances.
Transparent limitations
Race predictions, pacing estimates, and training examples cannot guarantee results. Actual performance and needs vary from person to person.
Important note about training advice
CalcStudio is an educational resource, not a medical service or a personalized coaching relationship. If you have a health concern, are returning from an injury, or are unsure whether a workout is suitable, seek advice from a qualified professional before changing your training.
Questions or feedback?
We value clear explanations and accurate tools. You can also read how we approach our running content and corrections.