Pace Lab vs Tempo Pace Calculator

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.

Tempo turns your running pace into something you can see and feel. Set a pace on the ruler and the whole screen takes its temperature: cool teal when you are running easy, red hot when you are flat out. The background is a living gradient that shifts with every second you scrub. PACE, INSTANTLY Drag the precision ruler to any pace and read it like a scoreboard. Every tick gives a light haptic tap, so the value has real texture under your thumb. FINISH TIMES FOR EVERY DISTANCE See your projected time across 400 m, the mile, 5K, 10K, half marathon, marathon, and the ultra distances. Pin your favorites to a grid on the home screen. CADENCE METRONOME Lock in your step rate with a metronome that taps the beat onto your wrist with real haptics, not just a click. Link it to your pace or run it on its own. SIX ICONS, ONE SHADER Choose the app icon that matches your mood, from ice to fire. Every icon is rendered from the same live gradient that paints the app. BUILT FOR THE PLATFORM Designed for Liquid Glass and iOS 26. No accounts, no tracking, no network. Your numbers never leave the phone, because there is nothing to collect. Metric and imperial, kilometers or miles, switchable any time.