Overtime & Shift Pay Calculators

Data version: 2026 pay rules

ShiftPay is a set of free, browser-only calculators for overtime, time-and-a-half, double time and shift differentials. Everything runs on the page you are viewing — the numbers you type never leave your device, and you never need an account.

Use them to double-check a payslip, model a new schedule, or compare what different overtime rules would mean for the same hours. Each tool shows the math line by line, so you can see how regular pay, overtime pay and any shift premiums add up to gross pay.

Everything stays on your deviceNo signupNothing uploadedUS & international rules

Overtime calculators

Overtime Pay CalculatorThe standard US weekly setup: enter rate, hours and threshold, see regular pay, overtime pay and gross pay. Time and a Half CalculatorLocked at 1.5x for the common US overtime rate. Just enter rate and hours. Double Time CalculatorLocked at 2x for union, holiday or California daily-overtime scenarios. California Overtime CalculatorDaily overtime over 8 hours, with 1.5x then 2x tiers and 7th-day rules.

By country

UK Overtime CalculatorOvertime is set by contract in the UK. Estimate with a sample 40-hour threshold. Canada Overtime CalculatorMost provinces use 44 hours per week at 1.5x. Adjust the threshold to match yours. Australia Overtime CalculatorAward-driven overtime over 38 ordinary hours. Set the multiplier to match your award.

Shift pay

Shift Differential CalculatorAdd flat night, weekend or holiday premiums to your base pay.

Overtime rules by state

Most US states follow the federal FLSA: 1.5x for hours over 40 in a workweek. A few states add a daily layer. Read the full comparison on the overtime laws by state page, which covers California, Alaska, Nevada and Colorado exceptions plus the federal baseline for all 50 states.

What makes ShiftPay different

Most overtime calculators send your inputs to a server and return a number. ShiftPay does the opposite: every calculation happens inside your browser using plain JavaScript. That means no database of pay figures, no login wall, and no risk of your employer or rate being recorded by us. It also means the pages load fast and work offline once opened.

We follow published public rules — the US federal FLSA, California daily overtime, and the common thresholds used in the UK, Canada and Australia — and we flag the cases where your contract or award matters more than the default setting.

How to use these calculators

Pick the page that matches your situation, enter the hours and rates that apply to you, and click Calculate. Every page explains the formula it uses and warns you about limits — for example, when a rule is set by contract rather than law, or when a state threshold differs from the federal one. The results are estimates; confirm anything official with your employer, payroll team or the relevant labor authority.

If your situation mixes overtime and shift premiums, run the relevant calculators one after another and add the lines together. For questions about the rules themselves, visit the state rules page or the country-specific calculator that matches your location.