800 m in 21 minutes is a pace of 2:38 per 100 m

Swimming 800 m in 21 minutes requires a pace of 2:38 per 100 m (26:20 per km / 42:22 per mile). This distance is the 800 m pool event.

At 2:38/100 m, each 25 m lap takes 0:40 and each 50 m length takes 1:19. To check a different time for 800 m, or to explore pool and open-water splits, use the calculator below.

Pace breakdown

Distance	800 m
Target time	21 minutes
Pace per 100 m	2:38
Pace per km	26:20
Pace per mile	42:22

Training paces at 2:38/100 m

Derived from your 2:38/100 m race pace using the same formula as the Swim Pace Calculator.

Easy (warm-up / recovery)	3:02/100 m
Aerobic base	2:46/100 m
Threshold	2:30/100 m
Build sets	2:22/100 m
Sprint intervals	2:14/100 m
Lap pace (25 m pool)	0:40/lap

Try a different time for 800 m

800 m in 11 minutes = 1:23/100 m
800 m in 13 minutes = 1:38/100 m
800 m in 15 minutes = 1:53/100 m
800 m in 17 minutes = 2:07/100 m
800 m in 19 minutes = 2:23/100 m
800 m in 21 minutes = 2:38/100 m

Faster: 19 minutes = 2:23/100 m

Want to calculate a different pairing? Open the Swim Pace Calculator to enter any distance and time, see pool and open-water splits, and build your training zones.