Swimming Tools
A score with mixed units, a slope through two points, and a hundred that is not a hundred.
SWOLF & Stroke Efficiency Calculator
SWOLF alongside the two honest numbers underneath it — because one score covers swims twice as fast as each other.
Critical Swim Speed CalculatorCSS threshold pace from two time trials — and the exact rule for how much a stopwatch error moves it: 100 over the distance spread.
Swim Pace & Yards to MetresSwim times and paces between yard and metre pools — where a 100 is 8.56% short and the yard mile is neither 1500 m nor a mile.