Decimal Time Converter

The two conversions, worked by hand

Minutes to decimal: divide the minutes by 60 and add the whole hours. 8h 30m → 30 ÷ 60 = 0.50 → 8.50. 8h 20m → 20 ÷ 60 = 0.3333 → 8.33. Decimal to minutes: keep the whole number as hours, multiply the decimal part by 60. 7.75 → 0.75 × 60 = 45 → 7h 45m. 8.33 → 0.33 × 60 ≈ 20 → 8h 20m. The converter runs both directions and shows the total minutes as a cross-check.

The four landmarks worth memorizing

The 4.35 trap: decimals are not minutes

The single most common timesheet error is reading the decimal as minutes. 4.35 does NOT mean 4 hours 35 minutes — it means 4 hours plus 0.35 of an hour, which is 0.35 × 60 = 21 minutes. The correct decimal for 4h 35m is 4 + 35 ÷ 60 = 4.58. Any decimal-hour figure whose digits after the point reach past .59 is a giveaway that someone wrote minutes where decimals belong — a value like 8.65 is a red flag, since minutes never exceed 59.

Output · formula · meaning

Why payroll refuses to work in hours and minutes

Pay is hours multiplied by a rate, and that multiplication only works cleanly with decimal hours — you cannot multiply 8:30 by $25, but you can multiply 8.50. Decimals also add with plain addition across a pay period: a week of 8.00 + 7.50 + 8.25 + 7.75 + 8.00 totals 39.50 hours, no carrying minutes at 60. Timesheets, time clocks, and accounting software all store time this way, which is why your pay stub shows 78.75 hours, not 78h 45m.

Rounding rules: what payroll is allowed to do

US employers may round clock times, but the rounding must be neutral — it cannot consistently favor the employer. The accepted increments are the nearest 5 minutes, the nearest quarter hour (15 minutes), or the nearest tenth of an hour (6 minutes), and the quarter hour is the maximum allowed. The famous 7-minute rule: under quarter-hour rounding, 1–7 minutes past the hour round down, 8–14 round up. Rounding to 20 or 30 minutes is not permitted, and exact time worked is always the safest policy.

Repeating decimals

Some minute counts never end as decimals: 10 minutes = 0.1667, 20 minutes = 0.3333, 40 minutes = 0.6667. The chart shows four decimal places so the repeating pattern is visible; payroll typically rounds to two, which is the third column. Rounding at the end of the period — not day by day — keeps the pennies honest.

Minute → decimal conversion chart (printable)

Who uses this

• Hourly workers: checking the pay stub: 78.75 hours on the stub should match 78h 45m on your notes.
• Small-business owners: running payroll by hand — decimals turn wage math into one multiplication.
• Freelancers: billing 6h 20m as 6.33 hours × rate, with the chart as the paper trail.
• Students: timesheet math is a classic word-problem topic — this page is the worked example.

Accuracy & limitations

Conversions are exact arithmetic: minutes ÷ 60 and decimal-part × 60, shown to 4 decimal places in the chart and 2 in payroll summaries. Repeating decimals (0.3333…) are rounded, not truncated — add the decimals first, then round once at the end of the pay period. This page is a time-format converter, not a tax or wage-and-hour advisor; rounding policies must stay neutral under the FLSA and state law.

Figuring whole workdays too? The business days calculator skips weekends, the 12-hour shift calculator splits regular and overtime pay, and the Unix timestamp converter decodes the epoch values behind the clock. In Excel, decimal hours in A1 become minutes with =A1*60 and an hh:mm time with =A1/24 formatted as time.