Question 1

What swimming calculators are available on dincalculator.com?

Accepted Answer

dincalculator.com offers three free swimming calculators: a swim pace calculator for converting between per 100m, per 100yd, and speed in km/h or mph; a Critical Swim Speed (CSS) calculator for finding your aerobic threshold pace from time trials; and a SWOLF score calculator for measuring swimming efficiency from stroke count and lap time.

Question 2

What is Critical Swim Speed (CSS)?

Accepted Answer

Critical Swim Speed (CSS) is the fastest pace a swimmer can sustain over a long distance without accumulating significant fatigue. It is calculated from a 400m and 200m time trial and represents the aerobic threshold in swimming — the equivalent of FTP in cycling or lactate threshold pace in running.

Question 3

What is SWOLF in swimming?

Accepted Answer

SWOLF is a measure of swimming efficiency calculated by adding the number of strokes per length to the time in seconds for that length. For example, 18 strokes + 45 seconds = SWOLF 63. A lower SWOLF score indicates better technique and efficiency. It is used by Garmin, Apple Watch, and Polar devices to track swimming performance.

Swimming Calculators