About

What HoursCalc is, how the calculators work, and where the data comes from.

What this site is

HoursCalc is a free collection of hours, pay, date and conversion calculators: time cards, timesheets, paychecks, overtime, rounding, dates, percentages, fractions and sales tax. Everything runs in your browser; there is no account and nothing is uploaded.

How the calculations work

The engine works in integer minutes and integer cents, never floating-point money, and rounds once at display time. Overtime is split in the order that avoids double counting: double time first, then daily overtime, then weekly overtime on the remaining regular hours per fixed 7-day work week. Rounding applies to each punch, never to totals, and the unrounded figure is always shown alongside. Every engine function is covered by automated tests for normal cases, midnight crossing, zero hours and threshold boundaries.

Data sources

Every reference table carries the date it was last verified and shows it on the calculator that uses it. Tax and labor rules change; confirm with the official source before relying on a figure for payroll.

• Federal tax 2026IRS Rev. Proc. 2025-32 (2026 inflation adjustments); IRS Pub. 15-T (2026); SSA 2026 wage base announcement2026-10-20
• State income tax 2026Tax Foundation, State Individual Income Tax Rates and Brackets (2026 edition) and state revenue departments2026-10-20
• Sales tax by stateTax Foundation, State and Local Sales Tax Rates, Midyear 2026; state departments of revenue2026-10-20
• Overtime rulesUS DOL Fact Sheet #23; state labor department overtime pages; 29 CFR 778 and 29 CFR 785.48(b) for rounding2026-10-20
• Meal and rest break rulesUS DOL Wage and Hour Division, state meal and rest break tables; state labor codes2026-10-20
• US public holidaysUS Office of Personnel Management federal holiday schedule (observed dates); generated by scripts/gen-holidays.mjs2026-10-20
• IRS mileage ratesIRS newsroom, standard mileage rate notices (IR-2025-xx for 2026)2026-10-20
• Ingredient densitiesUSDA FoodData Central (household measure weights) and King Arthur Baking ingredient weight chart; grams per US cup (236.6 ml)2026-10-20

Nothing is uploaded

Your entries auto-save in your own browser under a versioned key. Share links compress the calculator state into the URL itself, so a link you send contains the data and nothing is stored on a server. See the privacy policy for the two optional third-party lookups.

Found a mistake?

Rates and rules are checked against the sources above, but errors happen. Use the contact page and include the calculator, your inputs and the figure you expected.