# Pace Lab: Running Calculator — Splits, Predictions & Fueling

> Splits, Predictions & Fueling (iPhone/iPad app by Pyoungoh Yun.)

- Source: https://appshunter.io/ios/app/pace-lab-running-calculator/id6759136568 (this page in markdown: same URL + `.md`)
- Developer: [Pyoungoh Yun](https://appshunter.io/developer/1877024185)
- Category: Health & Fitness, Sports
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 31 MB
- Languages: American English, Japanese, Korean
- Released: 2026-03-03
- Data updated: 2026-05-15
- User reviews in markdown: https://appshunter.io/ios/app/pace-lab-running-calculator/id6759136568/reviews.md

## What is Pace Lab?

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.


## Version history (last 5 releases)

### 1.3.2 — 2026-04-12

- Added average pace by distance to the race time prediction screen.
- Improved the UI from input to results for a more seamless experience.

### 1.3.1 — 2026-04-05

- Added split-time display for 100m, 200m, and 300m in 400m results.
- Improved banner ad stability during screen transitions to reduce flicker and duplicate render issues.

### 1.3.0 — 2026-03-30

- Added a race split chart that lets you check cumulative times for each segment based on your target pace or finish time, along with real clock times.
- Added copy / export options to make it easier to use and share key calculation results.
- Refined overall usability throughout the app.

### 1.2.1 — 2026-03-13

Improved app stability and refined banner ad handling.

### 1.2.0 — 2026-03-11

• Added a mile unit option
• Added a quick pace input option for entering pace in a single field instead of separate minute and second fields
• Added estimated finish time calculation in the pace calculator
• Replaced the treadmill calculator with a dedicated pace ↔ speed conversion screen

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-15.*