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Stop guessing
your race time.

PaceBrain predicts your race time, then builds training to help you get faster.

Predict your race time

1A race you ran recently

2Your time

3Predict for

Training, optional

Your race time counts most. These can slow a longer race and widen the range, but never make it faster.

Weekly km

Sessions a week

Intensity

Longest run, km

No typing. No signup.

  • Free
  • No signup
  • 30 seconds

Six models, most based on published research

See a sample report
From the founder
5K PB
17:55
Race results
Podiums

PaceBrain is built by a runner who actually races. The product I trained on is the product you get.

I use PaceBrain to train myself — to find my weaknesses and my strengths. It's helped me achieve many podiums and my 5K PB of 17:55. Highly recommend using PaceBrain to take your performance to the next level.
N
Nick
Founder, PaceBrain
Nick Patterson, PaceBrain founder, trail running
SAMPLE

See Nick's real report

107parkruns*

Best parkrun 17:55 · watch time, Mar 2025

See the full report

*Includes 30 identified by Saturday start time and distance. Chart shows monthly bests; one slow 2022 run is not plotted.

See it in action.

Train, predict, or compete

Future You Simulator with adjustable volume, intensity, and consistency controls

Premium AI

Run the next 6 months before you train them.

Tweak volume, intensity, and consistency to project finish times. Powered by VDOT (Daniels) and Training Stress Score (Coggan) — the same models elite coaches use.

How the prediction is computed

No black box. We combine six models, most based on published research, weighted by how recent and how similar in distance your races are, then show you a confidence range — not false precision.

Critical Velocity
Adapted from Jones & Vanhatalo (2017)
Endurance Index
Adapted from Billat et al. (1999)
Power Law
Follows the Katz & Katz (1999) pace-decay form
VDOT (Daniels)
Follows the Daniels & Gilbert distance-equivalence tables
Riegel formula
Adapted from Riegel (1981)
Pace-decay curve
Our own curve for how pace slows over longer distances.

Simple, runner-friendly pricing

Predictor is free forever. Upgrade only if you want the loop.

Free
A$0forever
  • Race time predictor
  • Garmin sync
  • Basic running stats
  • Community leaderboard
Premium
  • Everything in Free
  • AI training plan tuned to your gap
  • Performance DNA + RunSignal + Recovery
  • Race-day pacing for your specific course
  • Adaptive plan that re-optimises weekly

Honest answers

The questions we get most. We'd rather lose your money than waste it.

Your watch is a record of what you did. PaceBrain tells you what to do next. Connect Garmin in one click and we turn the data you already have into a plan.
A runner at blue hour with a 3:42:18 marathon prediction overlaid on the road ahead

Your finish time is sitting in your training data right now.

Find it in 30 seconds. Free, no signup.