Free swim tool
Triathlon Swim Readiness Score
Answer seven questions. See how ready your swim really is, and your weakest limiter.
Your readiness updates as you answer. It is an educational estimate, not safety advice.
What makes you ready for a race swim?
Readiness is not just pace. A fast 100 in the pool tells you almost nothing about whether you can hold it together over the full race distance, in open water, when your heart rate spikes at the start.
Five things decide it: endurance (can you cover the distance non-stop), consistency (are you swimming often enough to adapt), open-water comfort (have you practised outside the lane lines), sighting (can you swim straight without a black line), and composure (do you stay calm when it gets crowded and choppy). This score weights all five.
Swim readiness FAQ
Am I ready for my first triathlon swim?
If you can swim the race distance non-stop, you have swum a few times in open water, and you can stay calm when crowded, you are in good shape. This score combines those signals into one number so you can see what is still missing.
How long should my longest training swim be?
Aim to comfortably cover at least your full race distance non-stop in training before race day. Building one longer continuous swim each week is the fastest way to move your endurance score.
How do I stop panicking in open water?
Practise. Start in calm, shallow water close to shore, breathe slowly, and roll onto your back to reset if anxiety rises. More open-water sessions and a controlled start build composure faster than anything else.
How many open-water swims before race day?
As many as you can. Three to four open-water sessions makes a real difference to comfort, sighting and start composure. One is far better than none.
Readiness is propulsion that holds, not a one-off fast 100
A readiness score points at your weakest limiter. Closing it means showing up consistently and building propulsion that survives fatigue, not chasing a single fast length. ZWIM measures that propulsion as Propulsive Watts, so the engine you build is the engine that holds on race day.
And readiness assumes you can actually get the sessions in. The weeks you miss because you can't reach the pool are where readiness quietly slips, which is exactly what Connected Swim Training is built for: the days between pool days.
Related swim tools
Know your number. Train the limiter that's holding it back.
ZWIM is Connected Swim Training for home: real Propulsive Watts and a real game, for the days you can't get to the pool.
This readiness score is an educational estimate, not safety or medical advice. Always train within your limits and follow event safety guidance. It does not guarantee you will complete any race. ZWIM helps you train between pool days; it does not replace pool swimming.