15 Minute Increment Chart
Use quarter-hour reference values to compare 15-minute increments with the .00, .25, .50, and .75 decimal pattern.
| Minute mark | Decimal fraction | Example total |
|---|---|---|
| 0 | .00 | 8:00 = 8.00 |
| 15 | .25 | 8:15 = 8.25 |
| 30 | .50 | 8:30 = 8.50 |
| 45 | .75 | 8:45 = 8.75 |
How to read this chart
Quarter-hour notation repeats .00, .25, .50 and .75 every hour.
The quarter-hour pattern
Fifteen minutes is one quarter of an hour, so quarter-hour increments repeat four decimal positions: .00, .25, .50, and .75.
15 ÷ 60 = 0.25 hour
Reading the rows
At the start of an hour, the decimal fraction is .00. At 15 minutes it is .25, at 30 minutes .50, and at 45 minutes .75. The next 15-minute step reaches the following whole hour.
For example, 8 hr 45 min is 8.75 decimal hours.