Pace Lab: Running Calculator

Pace Lab is a running calculator built for runners who want clear numbers without the clutter.

From pace calculations to race predictions, heart rate zones, training paces, and fueling plans, Pace Lab brings together the tools you need for training and race day.

■ 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 cumulative times and real clock times.

• Pace-speed converter
Switch quickly between running pace and speed.

• 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 and 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.

Recent changes:
- Added average pace by distance to the race time prediction screen.
- Improved the UI from input to results for a more seamless experience.