Free Online Calculator

Free Calculator – Simple Online Calculator

This free calculator is a fast, simple online calculator for everyday maths – adding up bills, splitting costs, working out discounts and percentages, or checking homework. It works like the calculator on your phone or desk, with large buttons, a clear display, memory keys, a calculation history and full keyboard support. There is nothing to download, no sign-up and no ads inside the calculator – it runs instantly in any browser on mobile, tablet or computer.

Unlike many basic calculators, this one follows the correct order of operations: multiplication and division are done before addition and subtraction, so 2 + 3 × 4 gives 14, not 20.

How to Use the Online Calculator

1. Type a number by tapping the keys or using your keyboard.
2. Choose an operation: + (add), − (subtract), × (multiply) or ÷ (divide).
3. Enter the next number and repeat for longer calculations – the running result is shown as you go.
4. Press = or Enter to get the answer. It is also saved in the history list.
5. Use C to clear everything, CE to clear only the current entry and ⌫ to delete the last digit.

Calculator Keys Explained

Key	What it does
C	Clears the whole calculation
CE	Clears the current number only
⌫	Deletes the last digit you typed
%	Percentage – see below
±	Changes the sign of the number (positive/negative)
√	Square root of the number on the display
MC / MR	Memory clear / memory recall
M+ / M−	Adds the display to memory / subtracts it from memory

How the Percentage Key Works

The % key works like a standard desk calculator, which makes everyday percentage sums quick:

• Add a percentage: 200 + 10 % = 220 (adds 10% of 200). Useful for VAT, tips or price increases.
• Subtract a percentage: 200 − 10 % = 180. Useful for discounts.
• Percentage of a number: 50 × 10 % = 5 (10% of 50).
• On its own: 25 % = 0.25.

For more percentage calculations – percentage change, reverse percentages and step-by-step working – use our percentage calculator.

Order of Operations

The calculator follows the standard BODMAS / PEMDAS rule for the four basic operations: multiplication and division first, then addition and subtraction, working from left to right. Examples:

You type	Result	Why
2 + 3 × 4 =	14	3 × 4 = 12 first, then 2 + 12
100 − 25 × 2 =	50	25 × 2 = 50 first, then 100 − 50
10 ÷ 4 =	2.5	Decimal results are shown in full
0.1 + 0.2 =	0.3	Rounded to avoid tiny binary errors

Need brackets, powers, trigonometry or logarithms? Try our scientific calculator. For equations with x, use the algebra calculator.

Using the Memory Keys

Memory is handy when you need to add up several separate results. For example, to total the cost of 3 items at £4.50 and 2 items at £7.25: type 3 × 4.50 = and press M+, then 2 × 7.25 = and press M+, then press MR to recall the total of 28. The "M =" indicator shows what is stored.

Quick Everyday Calculations

Task	Keys to press	Answer
25% off a 1,200 price	1200 − 25 % =	900
Add 20% VAT to 85	85 + 20 % =	102
Add 18% GST to 2,500	2500 + 18 % =	2,950
Split a 1,350 bill between 4 people	1350 ÷ 4 =	337.5
15% tip on 64	64 × 15 % =	9.6
Price per 100 g: 3.60 for 450 g	3.60 ÷ 450 × 100 =	0.8

Why Use an Online Calculator?

An online calculator is always one tap away in your browser – useful when you are already working on a laptop, filling in a form or comparing prices online. Big buttons make it easy to use on a phone, the history list lets you check what you typed, and keyboard support makes it quicker than a physical calculator when you are at a computer. Because it follows the correct order of operations, you can type a whole calculation in one go instead of working it out in pieces.

Everyday Uses

• Adding up a shopping bill or a list of expenses
• Splitting a restaurant bill between friends
• Working out discounts, VAT, GST and tips with the % key
• Unit prices – which pack size is cheaper
• Quick maths for homework and exams practice
• Budgeting, mileage and fuel costs

Calculator Online vs Phone and Desktop Calculators

Your phone and computer already have a calculator, so why use one online? A browser calculator is always one tab away when you are working on a laptop – no need to pick up your phone, unlock it and switch apps. It keeps a history of every calculation, so you can scroll back and check what you typed. It follows the correct order of operations, which many basic phone calculators do not: type 2 + 3 × 4 on a simple calculator app and some will show 20, while this calculator correctly shows 14. And because it runs in your browser, it works the same way on Windows, Mac, Chromebook, Android and iPhone with nothing to download or install.

Feature	This online calculator	Basic phone calculator	Pocket calculator
Correct order of operations (BODMAS)	Yes	Sometimes	Often no
Calculation history	Yes	Rarely	No
Keyboard typing	Yes	No	No
Memory keys (M+, M−, MR)	Yes	Rarely	Yes
Works on any device, no install	Yes	Phone only	No
Cost	Free	Free	Paid

Keyboard Shortcuts

On a laptop or desktop you can use the calculator entirely from the keyboard, which is much faster than clicking. Click anywhere on the page first so the keys are captured.

Key	Action
0–9 and .	Type numbers and the decimal point
+ and −	Add and subtract
* or x	Multiply
/	Divide
%	Percentage
Enter or =	Show the result
Backspace	Delete the last digit
Delete	Clear the current entry (CE)
Esc	Clear everything (C)

Everyday Maths Made Easy

Most calculations people do online are simple but easy to get wrong in your head. Here is how to handle the common ones on this calculator:

• Shopping discounts: for 30% off a 2,499 item, type 2499 − 30 % and press = to get 1,749.30.
• Adding tax: to add 18% GST or 20% VAT, type the price + 18 % or + 20 %. To remove VAT or GST from a price, use our VAT calculator or GST calculator.
• Splitting a bill: type the total ÷ the number of people. Add the tip first if you are leaving one.
• Unit prices: divide the price by the quantity to compare pack sizes – the lower number is the better deal.
• Monthly to yearly: multiply a monthly amount by 12; for weekly amounts multiply by 52.
• Averages: add the numbers and divide by how many there are, for example (72 + 85 + 91) ÷ 3 = 82.67.

Accuracy and Rounding

The calculator works with up to about 15 significant digits, the same precision used by spreadsheets. It automatically cleans up tiny floating-point errors, so 0.1 + 0.2 shows 0.3 rather than 0.30000000000000004, which you may have seen in other apps. Very large or very small results are shown in scientific notation, such as 1.2e+21. For money, round your final answer to two decimal places – rounding at every step can add up to a noticeable difference across many items.

Tips for Getting the Right Answer

• Check the expression line above the result before you press = – it shows exactly what you typed.
• Use the history to re-check earlier steps rather than starting again.
• Estimate first. If you expect an answer around 500 and see 5,000, a decimal point is probably in the wrong place.
• Use memory for running totals, for example adding up a shopping list with M+ after each item.
• Need more functions? For powers, roots, trigonometry and logarithms, switch to the scientific calculator; for equations, use the algebra calculator.

Who Uses a Free Online Calculator?

Students use it for homework checks and quick arithmetic when a scientific calculator is overkill. Shop owners and freelancers use it for bills, discounts and invoices. Office workers keep it open in a browser tab for budgets and reports. Parents use it to help children with maths, and older users like its large, clear buttons. Because it is free, private and needs no sign-up, it is ready whenever you need a quick answer.

Using the Calculator on a Phone or Tablet

The calculator is designed mobile-first. The buttons are large enough to tap accurately with a thumb, long numbers wrap onto a new line so they never run off the screen, and the layout fits portrait and landscape without zooming. To keep it one tap away, open the page in your browser and choose Add to Home Screen (Share menu on iPhone and iPad, or the ⋮ menu in Chrome on Android). It then opens like an app, straight to the keypad. The page is lightweight, so it loads quickly even on a slow mobile connection.

Privacy: Your Numbers Stay on Your Device

Every calculation happens inside your browser using JavaScript. The numbers you type and your calculation history are never sent to our server, never stored in a database and never shared. When you close the tab the history is gone. That makes this free calculator safe for salaries, bank balances, business figures and anything else you would rather keep to yourself. There is no account to create and nothing to install, and the calculator works the same way every time you visit.

Frequently Asked Questions