PACERYour race. Your pace. Your plan.
AI-generated km-by-km race execution plans for endurance athletes. Built on Riegel, McMillan and VO2 Max science.
Race day has always felt unpredictable, hard to pace, and easy to get wrong.
Built for athletes who want to execute.
First timers. PB chasers. Comeback stories.
For people who've done the training, but have never quite nailed the race.
Pacer turns your preparation into performance.
Run Wollongong
Half Marathon · 21.1 km
Finish time prediction
Tough day
1:53:40
Most likely
1:49:15
Good day
1:46:30
Wristband splits
Apple Watch ready0–3
5:10
3–6
5:05
6–9
5:08
9–12
5:04
12–15
5:02
15–18
5:07
18–21
5:03
Used by runners at Run Wollongong·TCS London Marathon·Sydney Marathon
Race day
Your race plan. On your wrist.
Live pace, fueling alerts and decision points — everything you need, exactly when you need it.
What makes it different
A plan built on science, not a generic pace calculator.
Science-backed predictions
Riegel formula, McMillan model and VO2 Max combined into one consensus prediction. Not a guess — a calculation.
Km-by-km execution
Every kilometre has a target pace, HR zone and effort label. Know exactly what to do at every point in the race.
Race day on your wrist
Load your plan onto Apple Watch. Target pace, elapsed time and fueling alerts — without touching your phone.
How it works
From zero to race plan in under two minutes.
Tell us about your race and training
Race date, distance, goal time, weekly mileage, and a few key details. Takes about 90 seconds.
Our AI builds your personalised plan in 30 seconds
Riegel and McMillan models run your inputs. The AI synthesises the output into a detailed execution guide.
Execute with confidence on race day
Follow your pacing bands, fueling schedule, and decision points. Everything is already decided.
Sample plan
This is what you get.
A real plan generated for a runner targeting the Run Wollongong Half Marathon.
Finish time prediction
Tough day
1:53:40
Most likely
1:49:15
Good day
1:46:30
Distance
21.1 km
Conditions
18°C / 72%
Avg pace
5:12/km
Pacing wristband
0–5 km
5:10/km
Easy
5–10 km
5:05/km
Build
10–15 km
5:02/km
Target
15–21 km
5:07/km
Hold
Fueling timeline
Stop guessing.
Start executing.
Build a free race plan in under two minutes. No account required.
Generate my free plan →