Calculation methodology and limits

The last pay field you edit controls the result

When you edit hourly rate last, that rate stays fixed while schedule changes update annual income. When you edit annual salary last, that annual amount stays fixed while schedule changes update its weekly and hourly equivalents. The other pay field shows a calculated equivalent rounded to cents.

For example, a fixed $48,000 salary with 40 hours per week and 50 paid weeks gives $24.00 per hour and $960.00 per paid week. Change to 52 paid weeks while keeping salary mode: annual gross stays $48,000, the hourly equivalent becomes $23.08, and the paid-week amount becomes $923.08. If unpaid leave reduces your actual annual salary, enter the reduced amount yourself.

How each gross-pay period is calculated

Changing only days per week changes the daily average. It does not change total weekly hours or annual pay. For example, four nine-hour days and six six-hour days both total 36 hours; enter 36 in hours per week for either schedule.

The tax column is a single-percentage scenario

Estimated deduction = gross × entered percentage ÷ 100; estimated take-home = gross − estimated deduction

At $48,000 gross and a 20% estimate, the yearly deduction is $9,600 and estimated take-home is $38,400. The 24% starting value is an example, not a tax recommendation. The tool does not look up federal, state, or local tax rules and does not model separate benefit deductions.

For a U.S. federal income-tax withholding question, use the IRS Tax Withholding Estimator → and review its eligibility and information requirements. Its purpose and inputs differ from this simple conversion tool.

Input limits, zero values, and rounding

• Hours are limited to 168 per week, days to seven, paid weeks to 52, and the flat percentage to 100. These bounds prevent unusable inputs; they are not recommended schedules.
• The hourly amount is capped at $1,000,000 and annual salary at $1,000,000,000. Inputs accept decimal points; commas, currency symbols, and other characters are removed.
• A zero divisor produces a zero per-unit result. In salary mode, annual and monthly amounts can remain positive with zero hours or paid weeks; that is an incomplete schedule, not a meaningful hourly rate.
• Arithmetic uses unrounded amounts; displayed currency is rounded to two decimal places. Multiplying a displayed weekly amount by paid weeks may differ by a few cents from the annual result.
• Editing a rounded equivalent pay field makes that displayed amount the new source. For example, changing from a $48,000 salary at 40 hours and 52 paid weeks to its displayed $23.08 hourly rate annualizes to $48,006.40.

What the tool leaves for a separate calculation

Overtime premiums, multiple hourly rates, tips, commissions, bonuses, benefits, currency conversion, and exact payroll dates are not calculated automatically. Each entered hour uses the same rate. For changing schedules or a midyear raise, use the variable-income walkthrough →. For a payslip comparison, use the paycheck guide →.

An hourly equivalent does not establish whether a worker qualifies for overtime. The U.S. Department of Labor overtime guidance → explains federal coverage and workweek rules; applicable state rules and employment circumstances may also matter.

Publisher, sources, and corrections

Piratechs publishes the calculator and its explanations. The calculation source code → shows the implementation. Worked examples on this site are fictional arithmetic illustrations. The IRS and Department of Labor links provide primary resources for questions outside the calculator’s scope; neither organization endorses this site.

Report a discrepancy using the contact instructions →. Include the last pay field edited, fictional inputs, and the expected result. Public issues can be followed in the project issue tracker →. Do not post personal payslips or financial records.