Pace Lab: Running Calculator
Splits, Predictions & Fueling
Only for iPhone
Free
iPhone
From pace calculations to race predictions and fueling strategies, all the tools runners need in one app.
Pace Lab is a running calculator built for runners who want clear numbers without the clutter.
■ Key Features
- Pace calculator
Calculate pace and speed from any distance and time.
- Race pace calculator
Set your goal time and get your target pace — then view full race splits with real clock times across the course.
- Pace–speed converter
Switch instantly between pace (min/mi or min/km) and speed (mph or km/h).
- 400m lap calculator
Convert between lap times and equivalent running pace for track sessions.
- Training pace calculator
Enter your goal time and get recommended paces for easy runs, long runs, marathon pace, threshold runs, and interval workouts.
- Heart rate zone calculator
Calculate your 5 training zones using Max HR, Resting HR, or Lactate Threshold (LTHR).
- Race time predictor
Predict finish times across distances using recent race results or VDOT-based estimates.
- Energy gel calculator
Get a personalized gel count and timing plan based on your race distance and goal pace.
No sign-up required — just the tools runners need for smarter training and race planning.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Added average pace by distance to the race time prediction screen.
- Improved the UI from input to results for a more seamless experience.
The developer, Pyoungoh Yun, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Pyoungoh Yun
- Size
- 32 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later.
- iPhone
- Languages
English and 2 more
- English, Japanese, Korean
- Age Rating
9+
- 9+
- Contains
Advertising
Health or Wellness Topics
- Copyright
- © 2026 Slowlane