How we calculate
Every calculator runs in your browser. Nothing you type is sent anywhere. Here is what the math is based on.
Hours and minutes
All time math is done in whole minutes, then converted. Decimal hours are minutes ÷ 60, shown to two decimal places. When an end time is earlier than its start time, we treat the shift as running past midnight and add 24 hours. Unpaid breaks are subtracted only when you enter them.
Overtime
Time card and timesheet calculators apply the federal rule: hours over 40 in a workweek are paid at 1.5× (you can change both numbers). On the biweekly timesheet each week is checked separately, because the FLSA doesn't allow averaging. The California calculator adds the daily and seventh-day rules from Labor Code §510 and doesn't count hours twice.
Taxes
Paycheck and no-tax-on-overtime estimates use 2026 federal brackets and standard deductions, Social Security at 6.2% up to $184,500 of wages and Medicare at 1.45% (plus 0.9% over $200,000). Federal income tax is annualized, which is close to, but not exactly, how payroll withholding tables work. State and local taxes are not included; our sister site StateCalcs covers them.
Sources
| Rule | Source |
|---|---|
| Overtime after 40 hours, workweek, regular rate | U.S. Department of Labor, FLSA overtime (29 CFR 778) |
| Rest breaks and meal periods | 29 CFR 785.18–785.19 |
| Time clock rounding | 29 CFR 785.48(b) |
| Shift differentials in the regular rate | 29 CFR 778.207(b) and 778.115 |
| California daily, weekly and 7th-day overtime | California Labor Commissioner, Overtime FAQ (Labor Code §510) |
| 2026 tax brackets and standard deduction | IRS Rev. Proc. 2025-32 |
| No tax on overtime deduction | IRS, What to know about the No Tax on Overtime deduction |
| 2026 Social Security wage base ($184,500) | Social Security Administration, 2026 COLA fact sheet |
Last checked October 2026. Found a mistake? Rules change, and we update the calculators when they do.