Overtime Calculator

What is an overtime calculator?

An overtime calculator turns four simple numbers — the hours you actually worked, your standard contracted hours, your hourly rate and an overtime multiplier — into the two answers people actually want: how many overtime hours did I do, and how much will those hours pay. It replaces the back-of-an-envelope maths most people do at the end of a busy week, and it's exactly the kind of quick check that's surprisingly hard to find in one clean place.

How overtime is worked out

There are two steps, and the calculator handles both live as you type.

1. Overtime hours. These are the hours beyond your standard (contracted) hours. If your standard week is 40 hours and you worked 45, you have 5 overtime hours. If you worked fewer hours than standard, there's simply no overtime — the calculator never shows a negative number.
2. Overtime pay. Each overtime hour is paid at your regular rate multiplied by an overtime multiplier. At $20 an hour and time-and-a-half (1.5×), every overtime hour pays $30. Five overtime hours therefore pay 5 × $30 = $150.

The calculator also adds your regular pay (standard hours × rate) to your overtime pay so you can see your total pay for the period.

Overtime rates: time and a half, double time

The multiplier is where contracts differ most:

• 1.25× — a common rate for the first block of overtime in some agreements.
• 1.5× (time and a half) — the most widely used overtime rate.
• 2× (double time) — often for Sundays, public holidays or hours well beyond the normal week.

Pick one of the presets or type your own — if your contract pays, say, 1.4×, just enter it. Leaving the rate blank still gives you the overtime hours, which is useful on its own for tracking a time-off-in-lieu balance.

How to use it

1. Enter your hours worked for the period (a week, a fortnight — whatever you're checking).
2. Enter your standard hours for the same period (the calculator defaults to 40).
3. Enter your regular hourly pay (or leave it blank to just count hours).
4. Choose an overtime multiplier — 1.5× is the default.
5. Read your overtime hours, the overtime rate per hour, the overtime pay and your total pay. Use Copy to grab a one-line summary for your records.

A worked example

You're contracted for 38 hours but worked 46 this week, earning £18 an hour, with overtime at time-and-a-half:

• Overtime hours: 46 − 38 = 8 hours
• Overtime rate: £18 × 1.5 = £27/hour
• Overtime pay: 8 × £27 = £216
• Total pay: (38 × £18) + £216 = £684 + £216 = £900

If you're checking the percentage your overtime adds to your pay, the Percentage Calculator handles that in a couple of clicks; for splitting a shared bill after payday, the Tip Calculator does the per-person maths.

A note on accuracy

This is a gross figure — pay before income tax and any social contributions, which vary by country and personal circumstances, so your take-home will be a little lower. Contracts also define things differently: some average hours over a longer reference period, some only pay overtime past a daily (not weekly) threshold. Treat the result as a clear, fast estimate and check the specifics in your own contract.

Private by design

The whole calculation runs in your browser with plain JavaScript. Your hours and pay are never uploaded, stored or shared — they stay on your device. The currency button is for display only and doesn't change the maths, so you can use it for any currency. You can find more number tools on the tools page.