Cycling & Sports Tools
Powerful interactive tools to help you plan, analyze, and optimize your training. From building custom workouts to analyzing race courses.
Running Race Planner
Create a science-based race plan with personalized pacing strategies, carbohydrate fueling schedules, and hydration targets. Includes adjustments for heat, humidity, and altitude based on proven sports science.
Features:
- VDOT-based performance prediction
- Evidence-based pacing strategies
- Carbohydrate & glycogen modeling
- Hydration & sodium planning
- Heat & altitude adjustments
- Km-by-km race blueprint
Race Nutrition Calculator
Create a complete, personalized nutrition plan for road races, time trials, and gran fondos. Calculate carbohydrate, fluid, and sodium targets based on scientific guidelines with time-stamped fueling schedules.
Features:
- Evidence-based carb calculations
- Sweat rate & hydration modeling
- Sodium balance optimization
- Time-stamped fueling schedule
- Product & bottle management
- GI risk assessment
Zwift Workout Builder
Build professional-quality Zwift workouts with our visual timeline builder. Drag and drop workout blocks, set FTP-based power targets, and export directly to .zwo files for use in Zwift.
Features:
- Visual drag-and-drop timeline
- FTP-based power targeting
- Multiple block types (warmup, intervals, cooldown)
- Real-time TSS & IF calculation
- Export to .zwo format
- Autosave & undo/redo
Cycling Race Pace Calculator
Calculate your cycling race pace with physics-based predictions. Upload your GPX file and get accurate time estimates based on your FTP, weight, CdA, and weather conditions including wind.
Features:
- GPX file upload & parsing
- Physics-based pace calculation
- Wind & aerodynamic modeling
- Elevation & gradient analysis
- Interactive course map
- Race interval breakdown
Ironman Bike Split Calculator
Calculate your Ironman bike split using physics-based modeling. Upload your race course GPX and get pacing predictions based on your FTP, weight, and conditions to preserve your legs for the marathon.
Features:
- GPX course file upload
- Ironman-specific IF guidance
- Wind & elevation modeling
- Physics-based predictions
- Interactive course map
- Run-preservation pacing
FIT File Tools
Access all FIT file tools in one place. View, analyze, and convert FIT files from Garmin, Wahoo, COROS, and other fitness devices. All tools process files locally for complete privacy.
Features:
- FIT file viewer
- Multiple converter options
- Works with all FIT devices
- Local processing
- No account required
- Free to use
FIT File Viewer
Visualize your workout data instantly. View GPS tracks, heart rate, power, cadence, and all metrics from FIT files. Includes interactive maps, charts, and detailed data tables. 100% private - files never leave your browser.
Features:
- Interactive GPS map visualization
- Heart rate & power charts
- Lap and split analysis
- Device info & settings
- Session summary metrics
- 100% private - processed locally
TCX File Tools
Access all TCX file tools in one place. View, edit, and convert TCX files from Garmin and many fitness platforms. All tools process files locally for complete privacy.
Features:
- TCX file viewer
- TCX file editor
- Multiple converter options
- Local processing
- No account required
- Free to use
TCX File Viewer
Visualize your workout data instantly. View GPS tracks, heart rate, speed, power, and other metrics from TCX files. Includes interactive maps, charts, and detailed data tables. 100% private - files never leave your browser.
Features:
- Interactive GPS map visualization
- Heart rate, speed & power charts
- Lap breakdowns
- Trackpoint data tables
- Multi-activity selection
- 100% private - processed locally
TCX File Editor
Modify activity metadata, trim activities, adjust GPS coordinates, and edit trackpoint data from TCX files. 100% private - files never leave your browser.
Features:
- Edit metadata (sport, name, time)
- Trim/crop activities
- Adjust GPS coordinates
- Edit trackpoint values
- Lossless XML patching where possible
- 100% private - processed locally
We're Building More Tools
We're continuously developing new tools to help athletes train smarter. Check back regularly for updates, or explore our extensive collection ofcycling calculatorsin the meantime.