Stopwatch Calculator

Natavision

About this app

Calculator for stopwatch arithmetic. Add, subtract, multiply, and divide race times without converting to seconds. Perfect for swimming and running / track / cross county. Intended for coaches, parents, and athletes.


Times are in HH:mm:ss.hh format (hours, minutes, seconds, hundredths). There is no need to type the colon or period, so "12345" is interpreted as "1:23.45" and ":30" is interpreted as "30.00".

Examples:

1. Calculating splits. Leg 4 started at 3:14.67 and ended at 4:11.50. What was leg 4's split?

    4 1 1 5 0 - 3 1 4 6 7 = 56.83

2. Calculating pace. Runner A finished the marathon in 3:26:54.48. What was her mile pace?

    3 2 6 5 4 4 8 ÷ 2 6 . 2 = 7:53.83

3. Calculating set duration. How long will 20 50s on :55 take to swim in practice?

    : 5 5 × 2 0 = 18:20.00

4. Calculating relay seed times. The four runners' individual times are 54.68, 57.32, 57.98, and 1:00.04. What would their relay time be?

    5 4 6 8 + 5 7 3 2 + 5 7 9 8 + 1 0 0 0 4 = 3:50.02

5. Converting between courses. Swimmer A swam a 5:44.86 short course yards 400 IM. What is that in meters? (1 yard = 0.9144 meters)

    5 4 4 8 6 × . 9 1 4 4 = 5:15.33

Ratings and reviews

Does exactly what it's supposed to.

Just what I needed. I works a treat. Thanks

What's new

This version is the same as the previous version except that it requires a later version of Android. As a result, it no longer requires you to grant unneeded permissions and it now displays correctly in landscape mode. It also seems to have changed the colors of the buttons on some devices.