Understand why payroll systems and law firms require decimal hours. Reference our complete conversion tables for 6-minute (0.1 hr) and 15-minute (0.25 hr) billing intervals.
Clocks run on a base-60 sexagesimal system, while currency runs on a base-10 decimal system.
If an employee works 7 hours and 30 minutes at $20/hour, multiplying 7.30 × $20 yields $146.00—which is mathematically incorrect. 30 minutes is 0.5 hours, so the correct pay is 7.50 × $20 = $150.00. That 4-dollar error repeated across 50 employees every week costs thousands.
Converting any number of minutes into decimal hours is straightforward.
Decimal Hours = Hours + (Minutes ÷ 60). For example, 8 hours and 42 minutes = 8 + (42 ÷ 60) = 8 + 0.70 = 8.70 decimal hours.
Standard convention adopted by law firms, CPAs, and litigation consultancies.
Every 6 minutes represents 0.1 of an hour: 1–6 mins = 0.1 hr; 7–12 mins = 0.2 hr; 13–18 mins = 0.3 hr; 19–24 mins = 0.4 hr; 25–30 mins = 0.5 hr; 31–36 mins = 0.6 hr; 37–42 mins = 0.7 hr; 43–48 mins = 0.8 hr; 49–54 mins = 0.9 hr; 55–60 mins = 1.0 hr.
Standard convention for construction, manufacturing, and creative agencies.
1–15 mins = 0.25 hr; 16–30 mins = 0.50 hr; 31–45 mins = 0.75 hr; 46–60 mins = 1.00 hr.
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