Pace Lab vs 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.

Any two numbers, and the rest solves itself. Enter a distance and a goal time and you get the pace. Enter a pace and a distance and you get the finish time. Distance, time, pace and speed — give it any two and the other two fill in, in kilometres or miles. THEN IT HANDS YOU SOMETHING Most pace calculators show you a number and stop there. This one builds a race plan card: your goal, your pace, and a split table for every segment — laid out so you can send it to a training partner or keep it on your phone for race morning. WHAT'S INSIDE • Four-way solver: distance, time, pace, speed • 20 race distances from 400 m to 100K, each with a note on what it asks of you • Split tables in kilometres, miles, or track laps • Even, negative, positive and fast-finish pacing strategies • Equivalent times across distances, so a 10K result suggests a half marathon target HOW IT'S BUILT Distances are kept in metres and times in seconds. Everything else is derived from those two and rounded only when it is shown to you, so the numbers stay consistent between the solver, the splits and the card. • No account. Nothing to sign up for. • No paywall and no subscription. Every feature is free. • No data collected. Your saved plans never leave this iPhone. • Works completely offline, including in airplane mode on the start line. Equivalent times come from a standard endurance model (Riegel, 1977). They are estimates, not predictions. This app is a calculator and planning tool — it is not coaching, training prescription, or medical advice.