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Calkulon

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Time Calculator

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Pro Tip

For payroll: hours worked × hourly rate. With overtime (>40hr US): first 40 at regular rate, remainder at 1.5×. Convert decimal hours carefully: 8.5 hours is 8h 30m, not 8h 50m.

Difficulty:Intermediate

Did you know?

The Babylonians (c. 2000 BCE) gave us the 60-minute hour and 60-second minute — their base-60 (sexagesimal) number system made 60 ideal because it divides evenly by 2, 3, 4, 5, 6, 10, 12, 15, 20, and 30.

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Reviewed May 2026
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