Time to Decimal Calculator
Convert time between HH:MM:SS format and decimal hours instantly.
Perfect for timesheets, payroll, and work hour calculations.
Also converts decimal back to hours and minutes.
What Are Decimal Hours? Decimal hours express time as a single number instead of hours and minutes. 7 hours 30 minutes = 7.5 decimal hours. 7 hours 45 minutes = 7.75 decimal hours.
This format is used in timesheets, payroll software, and spreadsheets because it is easy to add, subtract, and multiply. If you earned $20/hour and worked 7.75 hours, the math is simply 20 × 7.75 = $155.
Conversion Formulas Time → Decimal: Decimal Hours = Hours + (Minutes ÷ 60) + (Seconds ÷ 3600) Example: 7:45:30 = 7 + (45 ÷ 60) + (30 ÷ 3600) = 7 + 0.75 + 0.00833 = 7.75833
Decimal → Time: Hours = floor(Decimal Hours) Minutes = floor((Decimal Hours − Hours) × 60) Seconds = round(((Decimal Hours − Hours) × 60 − Minutes) × 60)
Common Conversions 0:15 = 0.25 hours (one quarter) 0:30 = 0.50 hours (one half) 0:45 = 0.75 hours (three quarters) 1:00 = 1.00 hours 1:30 = 1.50 hours 7:30 = 7.50 hours 8:00 = 8.00 hours 8:15 = 8.25 hours 8:30 = 8.50 hours 8:45 = 8.75 hours