Pace Lab: Running Calculator

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.