What is in this collection
Eighteen tools for swimmers and triathletes: pace per 100 m or 100 yd, SWOLF scores, critical swim speed from two time trials, pool length conversions, and finish-time estimates for every triathlon distance. The triathlon calculators add your transitions, because a race is swim plus bike plus run plus everything that happens between them.
Pool and open water are different sports. Pool pace benefits from turns and clear water; open water adds sighting, chop and traffic, which typically costs 3–8 seconds per 100 m. The tools state which context a number belongs to rather than pretending one pace covers both.
How to choose a starting point
If you have a recent race result, start with the training pace tool for your sport: VDOT for running, critical swim speed for swimming. If you are planning a race, start with the pace or finish-time calculator for the distance, then check the goal against the predictor. Every page states its formula, so you can reproduce the number by hand.
Frequently Asked Questions
What is a good SWOLF score?
Lower is better. In a 25 m pool, 30–35 is advanced, 36–45 is a typical club swimmer, and above 55 usually means stroke count is the thing to fix first.
How is CSS different from my best 100 m?
CSS is the pace you can hold for roughly 1500 m — sustainable threshold speed, not sprint speed. It comes from a 400 m and a 200 m time trial.
Do triathlon times include transitions?
Yes. Every triathlon calculator on this site adds T1 and T2, and the breakdown shows how much of the finish time they take.