---
title: "400m Interval Pace - Track Split Guide | TrainPace"
description: "Convert running pace into 400m track splits with worked examples. Choose controlled interval effort from current fitness, not an all-out sprint."
url: https://trainpace.com/calculator/400m-interval-pace
---

# 400m Interval Pace and Track Splits

Convert running pace into 400m track splits with worked examples. Choose controlled interval effort from current fitness, not an all-out sprint.

A 400m repetition is one lap in lane one of a standard outdoor track. Its target time depends on the workout: 400m at 5K effort is different from a fast repetition with full recovery. Use training zones as context, not as a reason to sprint every lap.

- To convert min/km to a 400m split, first convert the pace to seconds and multiply by 0.4.
- At 4:00/km, 400m takes 96 seconds (1:36); at 5:00/km, it takes 120 seconds (2:00).
- For mile pace, multiply seconds per mile by 400 / 1609.344. At 8:00/mile, a 400m lap is about 1:59.
- Keep repetitions repeatable and follow the recovery specified by your workout. Short rests and full recoveries create different sessions.

## How to work out 400m interval splits

Choose the effort before converting it to a lap time.

1. Estimate training zones: Enter a recent race result to see training paces based on current fitness.
2. Match the workout: Use the pace prescribed by your session rather than automatically choosing the fastest zone.
3. Convert the split: Multiply seconds per kilometre by 0.4, then convert the result back to minutes and seconds.

## Frequently asked questions

### How do I calculate my 400m split from pace per km?

Convert minutes and seconds to total seconds, then multiply by 0.4. For 4:30/km: 270 seconds × 0.4 = 108 seconds, or 1:48 per 400m.

### Is a 400m lap the same as a quarter mile?

No. A quarter mile is 402.336m, slightly longer than 400m. Use the actual repetition distance for your splits, especially when comparing track times with mile-pace targets.

### Should I run every 400m repetition at maximum speed?

No. For aerobic intervals, the aim is controlled, repeatable work. Sprint sessions are a different workout. Warm up first and choose effort, repetitions, and recovery appropriate to your experience and plan.

- [Calculate Your Interval Training Pace](https://trainpace.com/calculator)

## Training pace reference

**Training paces by recent 5K time (min/km)**

| 5K time | VDOT | Easy | Marathon | Threshold | Interval | Rep |
| --- | --- | --- | --- | --- | --- | --- |
| 15:00 | 69.6 | 3:45–4:30 | 3:23–3:42 | 3:15 | 2:56 | 2:32 |
| 17:30 | 58.2 | 4:20–5:12 | 3:54–4:17 | 3:46 | 3:23 | 2:56 |
| 20:00 | 49.8 | 4:54–5:53 | 4:26–4:51 | 4:16 | 3:51 | 3:19 |
| 22:30 | 43.4 | 5:29–6:34 | 4:57–5:25 | 4:46 | 4:18 | 3:43 |
| 25:00 | 38.3 | 6:03–7:14 | 5:28–5:59 | 5:16 | 4:45 | 4:06 |
| 27:30 | 34.2 | 6:37–7:53 | 5:59–6:33 | 5:46 | 5:13 | 4:30 |
| 30:00 | 30.8 | 7:11–8:32 | 6:30–7:06 | 6:16 | 5:40 | 4:54 |
| 32:30 | 28.0 | 7:44–9:10 | 7:01–7:39 | 6:46 | 6:07 | 5:17 |
| 35:00 | 25.6 | 8:17–9:48 | 7:31–8:12 | 7:15 | 6:34 | 5:41 |

## More pacing guides

- [Recovery Run Pace Guide](https://trainpace.com/calculator/recovery-run-pace)
- [800m Interval Pace and Two-Lap Splits](https://trainpace.com/calculator/800m-interval-pace)
- [Negative Split Marathon Pacing Guide](https://trainpace.com/calculator/negative-split-marathon)

## Method and sources

The numbers on this page are computed with the same code as the TrainPace calculators, from these published methods. They are training guidance, not medical advice.

- Daniels, J. Daniels' Running Formula. Human Kinetics — VDOT, training zones, and equivalent race times.
- Daniels, J. & Gilbert, J. (1979). Oxygen Power: Performance Tables for Distance Runners — the oxygen-cost and %VO2max equations behind VDOT.

## Other TrainPace tools

- [Pace Calculator](https://trainpace.com/calculator) — training paces from a recent race result
- [VDOT Calculator](https://trainpace.com/vdot) — fitness score and equivalent race times
- [Training Plan Builder](https://trainpace.com/plan) — week-by-week 5K to marathon plans
- [Race Fuel Planner](https://trainpace.com/fuel) — carbs per hour and gel counts
- [Elevation Finder](https://trainpace.com/elevation-finder) — GPX route and climb analysis

## For AI agents

Every public page on this site has a Markdown mirror at the same path with a .md suffix (for example /calculator.md), and honors an Accept: text/markdown request header on the HTML URL. The calculations here are also available as callable tools through a free public MCP server — no account or API key.

- [llms.txt](https://trainpace.com/llms.txt) — site index for agents
- [llms-full.txt](https://trainpace.com/llms-full.txt) — every page's Markdown in one file
- [MCP server docs](https://trainpace.com/mcp) — endpoint, tools, and client setup