Convert between standard time (HH:MM:SS) and decimal hours with the Decimal Time Converter. Enter hours, minutes, and seconds to get the decimal hours equivalent — or enter a decimal hours value to convert back to hours, minutes, and seconds. Useful for payroll, billing, and project time tracking.
Decimal Hours
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Hours
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Minutes
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Seconds
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Formatted Time (HH:MM:SS)
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Decimal time expresses time as a regular decimal number rather than in hours, minutes, and seconds. For example, 1 hour 30 minutes becomes 1.5 hours. It's widely used in payroll processing, client billing, freelancing, and project management because it makes time-based calculations far simpler — you can multiply decimal hours directly by an hourly rate without any conversion steps.
Divide the minutes by 60 and add the result to the hours. For example, 3 hours and 45 minutes becomes 3 + (45 ÷ 60) = 3.75 decimal hours. If seconds are involved, divide them by 3600 and add that to the total as well.
Take the whole number portion as the hours, then multiply the decimal portion by 60 to get the minutes. For example, 2.25 hours = 2 hours and (0.25 × 60) = 15 minutes, giving you 2:15:00. Any remaining decimal in the minutes can be multiplied by 60 to get seconds.
Once you have total hours in decimal format, simply multiply by the hourly rate. For instance, if an employee worked 8.75 decimal hours at $20/hour, their pay is 8.75 × $20 = $175. This is much simpler than working with hours and minutes separately.
13 minutes in decimal format is approximately 0.2167 hours (13 ÷ 60 = 0.2167). Rounding conventions vary by employer — some round to the nearest hundredth, while others use a standard minute-to-decimal chart.
Payroll and HR departments, law firms, accounting and consulting firms, healthcare providers, construction companies, and freelancers all rely heavily on decimal time. Any industry that bills by the hour or tracks labor costs benefits from the simplicity of decimal-format time records.
Standard time (HH:MM) requires extra conversion steps before arithmetic can be performed, which increases the chance of errors. Decimal hours can be added, subtracted, and multiplied directly — making overtime calculations, total weekly hours, and wage calculations faster and more accurate.
Decimal time has roots in the French Revolutionary era, when France briefly adopted a 10-hour day with 100 minutes per hour. The modern use of decimal hours for payroll and timekeeping emerged later as businesses sought simpler ways to calculate wages, and it has become a standard practice in many industries worldwide.