Free swim tool
Swim Split Calculator
Race distance + goal time in. Target pace and a split-by-split plan out.
Even pacing: hold the same pace the whole way.
How swim split pacing works
Your target pace is your goal time spread across the distance. Then you decide how to distribute it: evenly, or as a negative split where the second half is faster than the first.
Target /100 = goal time ÷ (distance ÷ 100)Even vs negative split
An even split holds the same pace start to finish, the simplest plan to execute. A negative split starts a touch easier and finishes faster, which often produces a better race because you avoid blowing up early. This tool shows both, segment by segment.
Swim split FAQ
How do I calculate my swim splits?
Divide your goal time by the distance, scaled to 100, to get your target pace per 100. Multiply that pace by each segment to get cumulative split times.
Should I swim even or negative splits?
Even pacing is easiest to control. Negative splitting, starting around 2% slower and finishing about 2% faster, is often smarter for distance events because it guards against starting too hard.
Do these splits hold in open water?
Treat them as a pool-based plan. Sighting, chop, drafting and mass starts shift real open-water splits, usually slower.
A pacing plan only works if the engine holds
A split chart tells you the pace to hit. It can't tell you whether your stroke holds together when you fatigue, that's propulsion. ZWIM measures it as Propulsive Watts, so the pace you plan is a pace you can actually sustain.
And splits assume you got the training in. The sessions you miss because you can't reach the pool are where plans fall apart, which is exactly what Connected Swim Training is built for: the days between pool days.
Related swim tools
Plan the splits. Train the engine that holds them.
ZWIM is Connected Swim Training for home: real Propulsive Watts and a real game, for the days you can't get to the pool.
Split times are estimates for planning, not race promises. Open-water results vary with conditions. ZWIM helps you train between pool days; it does not replace pool swimming.