RunCalc: Altitude & Pace
Race time converter & splits
Free · Designed for iPad. Not verified for macOS.
Now with sharper altitude conversions at every NCAA altitude venue. Better at high altitude venues.
Convert race times across any altitude — instantly.
Pick your start and finish track from 190+ NCAA venues, or enter any custom elevation. RunCalc applies a per-distance altitude correction and shows your equivalent time, broken-down splits, and Riegel projections in one tap.
Built for distance and middle-distance runners, track and cross country coaches, and college recruiters comparing PRs across venues.
WHY RUNCALC
The NCAA normalizes race times so collegiate athletes can be compared across venues at different altitudes. Most runners only see those numbers at formal meets. RunCalc puts the math in your pocket — useful for training, recruiting, and pacing on race day.
FEATURES
• Altitude time conversion — sea level to Albuquerque, Boston to Boulder, anywhere to anywhere
• 190+ NCAA tracks, indoor and outdoor, with verified elevations
• Custom altitudes — enter any elevation in feet or meters
• Pace splits — 200m, 400m, 1k, or mile intervals for any race distance
• Equivalent times — Riegel projections from 100m through marathon
• Conversion history — save, revisit, and share past calculations
• GPS proximity — RunCalc detects nearby tracks and offers to use them
• Favorite tracks — star the venues you use most so they pin to the top
• Imperial or metric
HOW IT WORKS
RunCalc applies a per-distance altitude correction above 2000 feet, aligned with the Daniels Oxygen Power tables — the same family the NCAA used historically. Sprints (100–400m) are largely unaffected. Longer races take a larger penalty as VO2max declines with elevation. We are not affiliated with the NCAA.
PRIVACY
No accounts. No analytics. No advertising. No tracking. Location is used only on-device to detect nearby tracks — it is never transmitted.
Made by a runner, for runners.
Got a feature request or bug? Email runcalcapps@gmail.com
Altitude conversion algorithm improvements against fresh reference
data captured this spring. Conversions are noticeably more accurate
at NCAA altitude venues — Adams State, Air Force, Northern Arizona,
Wyoming, Colorado, Albuquerque, BYU and the rest of the high-altitude
circuit.
The developer, Nathan Lambson, 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.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Nathan Lambson
- Size
- 987.1 KB
- Category
- Sports
- Compatibility
Requires iOS 18.2 or later.
- iPhone
Requires iOS 18.2 or later. - iPad
Requires iPadOS 18.2 or later. - Mac
Requires macOS 15.2 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Nathan Lambson