About iSwimband

Most of the numbers that matter in swimming get worked out on a wet pool deck, in your head, between sets. What pace did that 400 come out to per 100? How many lengths is a mile in this pool? What send-off should the next set go on? How far did today’s swim actually add up to? None of it is hard arithmetic, but doing it dripping and out of breath, over and over, is exactly when it goes wrong. iSwimband was built to do that maths for you so you can spend the energy on swimming.

The site is a set of small, single-purpose calculators, each aimed at one real question a swimmer asks. The Swim Pace Calculator turns a time and distance into pace per 100 m, per 100 yd, and per 50 m, and speed in metres per second. The SWOLF Score Calculator pairs your stroke count with your time to score stroke efficiency, and normalises it to 25 m so a 50 m or 25 yd pool reads on the same scale. The Distance & Lap Counter converts lengths into a total in both metres and yards, or tells you how many lengths a target distance needs. The Swim Calorie Burn Calculator estimates energy use from your stroke, effort, weight, and time using the standard MET model. The Interval & Set Builder assembles a set from reps, distance, target pace, and rest, and hands back the swim time per rep, the total, and a send-off rounded to the pace clock. And the Yard ↔ Meter Pool Converter flips distances and times between short-course yards, short-course meters, and long-course meters using the exact 1 yard = 0.9144 m factor.

Beyond the calculators, the blog and learn section cover stroke technique, training and pacing, gear and wearables, and water safety, and the reasoning behind the numbers the tools produce. The Swimming Museum is a browsable collection of the strokes, the champions, the great pools, and the world of open-water swimming, with every entry, image, and fact drawn from Wikipedia and Wikimedia Commons.

A few things worth stating plainly. iSwimband is an independent site, not a coaching service, a governing body, or a medical provider, and it is not affiliated with any swim federation or equipment brand. It is supported by advertising, which is how the tools stay free with no account required. Every result — a pace, a SWOLF score, a calorie estimate, a converted time — is a general estimate built on the numbers you enter and on standard formulas, not personal coaching or health advice. Swimming carries real risks, especially in open water and for new swimmers, so treat anything safety-related as a starting point and follow qualified instruction and lifeguard guidance. If a tool looks off, or you think a calculator is missing that would help, the contact page is the place to say so.