Running Pace Calculator Splits

Marathon Time Predictor, Zones

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Dial in your race pace before the gun. Solve pace, time or distance, plan negative splits, and predict your marathon finish from any recent result. PREMIUM — PURCHASE REQUIRED: All features described below are part of Pro and require a purchase: a weekly or yearly auto-renewing subscription, or a one-time lifetime purchase. You don't need another app to record your runs. You need the math right: the exact pace that gets you across the line at your goal time, the splits that get you there without blowing up in the final third, and an honest prediction of what you can actually run. RunSplit is that calculator — built for the week before the race, not the race itself. No tracking, no sensors, no watch required. Type your numbers, get your answers, write them on your arm. WHAT YOU GET • Solve any two of pace, time and distance for the third — a 3:49 marathon becomes 5:26/km or 8:45/mi in two taps, with km/h and mph alongside. • A full split table for your goal time: every kilometre or mile with its pace and elapsed time, so you know 10K in should read 49:40 — and whether you're ahead of yourself. • A negative-split slider: start a few percent easier, finish faster, and see the whole fade charted before you commit to it on race day. • Race predictions from a result you've already run — enter your 22:30 5K and Riegel's endurance formula projects your 10K, half and full marathon. • Six training pace zones from your threshold pace, following the intensity tiers in Jack Daniels' Running Formula — recovery through repetition, in your units. • Treadmill incline converted to equivalent flat-ground pace, so 5:00/km at 4% grade finally gets the credit it deserves. Save your race plan — distance, goal, splits and all — and reopen it any time before the gun goes off. PERFECT FOR • The marathoner deciding, two weeks out, whether the goal is 3:59 or reality • Half-marathon runners chasing a personal best with an even or negative split • Coaches who write splits for athletes and are tired of spreadsheets • Treadmill runners keeping winter workouts honest at real outdoor effort WHY NOT JUST A TRACKING APP? Trackers tell you what you ran after it's over. RunSplit answers the question you actually have beforehand: what should the clock read at every marker if today goes right? It's the difference between reviewing a race and planning one — and planning is where the PB is made. PRIVATE BY DEFAULT Everything is computed on your iPhone. No account, no sign-up, and your saved race plans never leave the device. PREMIUM (PURCHASE REQUIRED) RunSplit Pro unlocks the race-time predictor, training pace zones, the treadmill converter, negative-split planning and unlimited saved plans. Choose a weekly or yearly subscription, or a one-time lifetime purchase — every option unlocks everything. Pick your race, set your goal, and walk to the start line already knowing every split. Download RunSplit and do the math before the gun. Terms of Use: https://leanstudio.asia/terms-of-use Privacy Policy: https://leanstudio.asia/privacy-policy Support: support@leanstudio.asia

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Version 1.1

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The developer, LEAN ASIA CO., LTD, 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 Not Collected

    The developer does not collect any data from this app.

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    Information

    Seller
    LEAN ASIA CO., LTD
    Size
    4.8 MB
    Category
    Health & Fitness
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    4+
    In-App Purchases
    Yes
    • Treadmill Speed Lifetime $29.99
    • Run Planner Yearly $14.99
    • Km-Mile Converter Weekly $2.99
    • Learn More
    Copyright
    © 2026 LEAN ASIA CO., LTD
  • Developer Website
  • Privacy Policy

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