Free Running Tools to Optimize Your Training
Calculate pace, hydration and predicted race times with simple, free tools. No signup required.
Why use running calculators?
Whether you prepare for a marathon, a half-marathon or your first runs, knowing your target pace and hydration needs makes the difference between success and an early dropout.
Our free calculators help you:
- ✅ Plan your pace: Determine ideal min/km for your goal time and distance
- ✅ Prevent dehydration: Calculate water & electrolyte needs by weight, duration and weather
- ✅ Set realistic goals: Use personal records to predict performance
These tools are free, no signup required, and designed for all levels: beginners to experienced marathoners.
Practical use cases
Preparing your first marathon
Use the pace calculator to set a target pace and hydration calculator to plan refueling.
Breaking your 10K PR
The race predictor estimates your potential based on recent performances.
Starting running
Follow the 0→5K program and use the pace tool to track progress.
Pace calculator
Calculate target pace (min/km) from distance and time.
Try →Hydration & nutrition
Estimate fluid needs by weight, duration and weather.
Try →Race predictor
Use your records to estimate performance on a target distance.
Try →Full Lab in the Bivora App
The web Lab offers 3 essential calculators. In the Bivora app you get a complete suite: Race Coach, nutrition plans, elevation analysis.
- Smart Race Coach: Personalized training & race plans
- Advanced tools: Zones, glycogen management, recovery simulator
- Course-adapted plans: Automatic elevation & weather analysis for tailored plans
Running tools FAQ
How to calculate pace in min/km?
Use the pace tool: enter distance (marathon, half, 10K) and goal time. The tool outputs pace in min/km and min/mile with splits per km.
How much water to drink during running?
It depends on weight, duration and temperature. Our hydration tool personalizes needs. Avg: 150-300ml every 15-20min for efforts >60min.
How to predict marathon time from a 10K?
The race predictor uses personal records (Riegel) to estimate potential on other distances.
Are the tools free and no signup?
Yes, the web Lab calculators are 100% free and require no signup. For advanced features, download the app.