Hours to Percentage: Converting Time into a Share of the Period
Converting hours to a percentage is a simple division — hours worked divided by the hours in the period, times 100 — but it goes wrong whenever clock time gets mixed with decimal time. Convert minutes to decimals first, then divide.
Minutes to decimal hours
- 15 minutes = 0.25 hours, 30 = 0.5, 45 = 0.75.
- Any other value: minutes ÷ 60. So 7:20 becomes 7.333 hours.
- Never enter 7.20 for seven hours twenty minutes — that is 7 hours 12 minutes.
Full-time equivalent
FTE is the same ratio expressed as a decimal rather than a percentage: 21 hours against a 40-hour full-time week is 0.525 FTE or 52.5%. Employers use FTE for headcount budgeting and pro-rata benefits, so confirm what your organisation counts as 1.0 — commonly 35, 37.5 or 40 hours.
Common bases
- Percentage of a working day: hours ÷ 8.
- Percentage of a working week: hours ÷ 37.5 or ÷ 40.
- Percentage of a 24-hour day: hours ÷ 24 — used for uptime and shift coverage.
- Utilisation: billable hours ÷ available hours, the key agency and consultancy metric.
Key takeaways — Hours to Percentage Calculator
- Convert minutes to decimal hours before dividing.
- Percentage and FTE are the same ratio in different clothes.
- State the base — a day, a week or a 24-hour period all give different percentages.