Free Running Pace Calculator 🏃

Calculate…

Distance

5.0000 km · 3.1069 mi

Time (h : min : sec)

Fill in any two fields above to instantly calculate the third, plus a full mile split table.

What is Free Running Pace Calculator 🏃?

🏃 The HIF Logic Free Running Pace Calculator is a three-way solver: enter any two of the three core running variables — Distance, Time, and Pace — and it instantly calculates the third. It also generates a complete mile-by-mile split table so you know exactly where you should be at every milestone. 📐 The Core Relationship: Pace = Time ÷ Distance Where: Pace = time per unit of distance (min/mile or min/km) Time = total finish time (hours, minutes, seconds) Distance = race or run length (miles or kilometers) This equation rearranges into three modes: Solve for Pace: Pace = Total Time ÷ Distance Solve for Time: Time = Pace × Distance Solve for Distance: Distance = Total Time ÷ Pace Standard race distances: 5K = 5.000 km = 3.107 miles 10K = 10.000 km = 6.214 miles Half Marathon = 21.0975 km = 13.109 miles Full Marathon = 42.195 km = 26.219 miles Example — sub-30-minute 5K: Target time = 29:59 (1,799 seconds) Distance = 3.107 miles Required pace = 1,799 ÷ 3.107 = 579 sec/mi = 9:39 per mile 📊 Understanding Split Tables: A split table lists your cumulative elapsed time at each mile (or kilometer) marker. If your pace is perfectly even, every row increases by exactly one pace unit. Real races involve hills, fatigue, and crowd dynamics — split tables help you notice if you went out too fast in miles 1–3 and adjust before you blow up later in the race.

How to Use This Tool

1
Select what you want to calculate: "My Pace" (if you know goal time and distance), "Finish Time" (if you know pace and distance), or "Distance" (if you know pace and time).
2
Set your Distance using one of the four race presets (5K, 10K, Half Marathon, Full Marathon) or select "Custom" and enter your own with a mi/km toggle.
3
Enter your Time (hours : minutes : seconds) or Pace (minutes : seconds per mile or km) depending on the mode. All fields update live — no calculate button needed.
4
Read your primary result in the hero card — finish time, pace per mile, and pace per km are all shown simultaneously.
5
Scroll down to the Mile Split Table to see your cumulative time at every mile marker. For marathons, all 26 miles are shown in a scrollable table.
6
Toggle between min/mi and min/km pace at any time — all calculations and the split table update instantly.

Real-World Use Cases

A First-Time Runner Setting a 5K Goal

You've signed up for a local charity 5K and want to finish in under 30 minutes. Select "My Pace," choose the 5K preset, and enter 0:29:59 as your target time. The calculator instantly shows you need a 9:39 per mile pace. The split table confirms: Mile 1 at 9:39, Mile 2 at 19:18, Mile 3 at 28:57, finish at 30:00. Screenshot the split table and check your GPS watch at each mile marker on race day.

A Marathoner Targeting Sub-4 Hours

Your goal is 3:59:59. Select "My Pace," choose the Full Marathon preset, enter 3:59:59 as your target time. Required pace: 9:09 per mile. The 26-row split table shows Mile 10 at 1:31:34, Mile 20 at 3:03:08, Mile 26 at 3:58:57. If you're ahead at Mile 10, you're going too fast. If you're behind at Mile 20, it's time to push. Race strategy made simple.

Converting Any Run to Pace and Projections

You covered 15 miles in 2:18:00 and want your average pace and projected 10K time. Select "My Pace," enter 15 mi custom distance, set time to 2:18:00 — average pace is 9:12/mile. Now switch to 10K preset and enter 9:12 pace: projected 10K finish is 57:11. One tool handles every pace-related question in your training log.

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