# Calcpace — Track your runs. Understand your fitness.

High-precision tools for runners. Race prediction, performance by age, and VO2max estimation.

## Tools for performance

- **Pace Calculator**: Compute pace, time or distance instantly. Supports min/km, min/mi, km/h and mph. [Open Calculator](https://calcpace-ccab5cc04603.herokuapp.com/calculator.md)
- **Race Predictor**: What's my predicted marathon time based on a 5K? Using Riegel and Cameron models. [Read Guides](https://calcpace-ccab5cc04603.herokuapp.com/guides.md)
- **Performance by Age (WMA)**: Evaluate your performance and compare it fairly across different ages and genders. [Open Age-Grade](https://calcpace-ccab5cc04603.herokuapp.com/calculator.md?mode=age_grade)
- **VO2max Estimator**: What's my current fitness level? Estimate your aerobic capacity from a race result.
- **Race Calendar**: Upcoming marathons, half-marathons, and major running events worldwide. [View Calendar](https://calcpace-ccab5cc04603.herokuapp.com/race-calendar.md)


## Save your progress

- **Privacy-First Activity Tracking**: Log your runs privately and without ads. Analyze how your fitness evolves over time without worrying about privacy.
- **GPS & Map Support**: Upload your GPX files to automatically extract distance and elevation data. View your route on a map and analyze your pace splits.
- **Share Your Journey**: Create your public running profile. Share your activity data, PBs, and goals with friends or your coach.

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[Guides Index](https://calcpace-ccab5cc04603.herokuapp.com/guides.md) | [Logic Core (llms.txt)](https://calcpace-ccab5cc04603.herokuapp.com/llms.txt)