In a 25-yard pool, 70.4 laps equal a mile. Dividing the number of yards in a mile (1,760) by the length of the pool (25) results in the number of laps that are in a mile.
Swimmers can keep track of the number of laps they have completed by using swimming lap counters or other counting techniques. Some swimmers use scuba diving slates, wristwatch split buttons, ring-type lap counters or waterproof golf stroke counters to track their progress. Other popular counting techniques include asking a coach or second person to track lap numbers, relying on memory and estimating distance based on pace.