Calculators · Free · No sign-up
Free Online Calculator
An online calculator works out a sum you type or tap, in the browser. This one handles + − × ÷, brackets, powers and percentages, shows the answer as you type, keeps your last ten sums on this device, and lists the site’s specialist calculators below it.
Nothing you type is sent anywhere.
Try a sum
History
Type the sum the way you would write it, or tap it in. The answer appears underneath as you go, = or Enter fixes it, and it stays in the box so the next step carries on from it. A percentage means what you mean by it: 200 + 10% is 220.
A calculator takes a sum and gives its value, working the operations in a fixed order: brackets, then powers, then multiplication and division, then addition and subtraction. Where calculators differ is the percent key, which is why this page says exactly how it reads one.
- No sign-up
- Nothing sent anywhere
- Answer as you type
- History on your device
Key facts
| Detail | Answer |
|---|---|
| Price | Free, no sign-up, nothing to install |
| Operations | Add, subtract, multiply, divide, powers, brackets and percentages |
| Order of operations | Brackets, powers, then × and ÷, then + and −, each left to right; a chain of powers right to left |
| Percentages | 200 + 10% = 220 and 200 − 10% = 180; anywhere else, x% is x ÷ 100 |
| Precision | Rounded once, to 12 significant digits, so 0.1 + 0.2 shows 0.3 |
| Very large or small answers | Shown in e notation, such as 1e+22 |
| Keyboard | Type the sum; Enter gives the answer, Esc clears |
| History | The last 10 sums, kept in this browser only |
| How the sum is read | Parsed as arithmetic; what you type is never run as code |
| Where sums go | Nowhere: worked out in your browser |
| Specialist calculators | 1 so far, listed below |
How to use the online calculator
Type it, read it, carry on from it.
Type or tap the sum
Use the keys or your keyboard:
48.50 + 15%. The answer shows under the box as you type.Bracket what goes first
(2 + 3) × 4is 20; without the bracket it is 14.Press = or Enter
The answer is fixed in the display and added to the history.
Carry on from the answer
It stays in the box, so typing
÷ 4next divides the answer by four.Reuse a past sum
Tap a line in the history to bring it back and change it.
Copy the answer
Copy puts the displayed answer on your clipboard.
What people use a quick calculator for
Short sums that are easier typed out than worked in your head.
Discounts
59.99 − 25%gives the sale price, 44.9925, in one line.Tips and splitting a bill
48.50 + 15%, then÷ 4for each person’s share.VAT and sales tax
Add it with
+ 20%; take it off a total with÷ 1.2, not − 20%.Totalling counts
Add up the tallies from several counters,
23 + 41 + 17, or turn one into a share of the total.Scaling a recipe
Multiply each amount by the same factor: 1.5 for six people instead of four.
Savings and growth
1000 × (1 + 5%)^10is what 1,000 grows to in ten years at 5% a year: 1,628.89.
How percentages work on this calculator
Calculators disagree about one thing, and it is percentages. Type 200 + 10% into this calculator and you get 220: ten percent of 200 is added to 200, which is what almost everyone means. Type =200+10% into a spreadsheet and you get 200.1, because a spreadsheet reads 10% as the number 0.1 and adds that.
So the rule here, stated once: a percentage added to or taken from a number is that share of the number, as on a pocket calculator. Anywhere else, x% is simply x ÷ 100.
| You type | This calculator | A spreadsheet | Read as |
|---|---|---|---|
200 + 10% | 220 | 200.1 | 200 plus 10% of 200 |
200 − 10% | 180 | 199.9 | 200 less 10% of 200 |
200 × 10% | 20 | 20 | 10% of 200 |
50% | 0.5 | 0.5 | 50 ÷ 100 |
The everyday percentage sums
| Question | Type | Answer |
|---|---|---|
| What is 15% of 80? | 80 × 15% | 12 |
| A 48.50 bill plus a 15% tip | 48.50 + 15% | 55.775 |
| 59.99 with 25% off | 59.99 − 25% | 44.9925 |
| What percentage is 30 of 120? | 30 ÷ 120 × 100 | 25 |
| Change from 100 to 120, in percent | (120 − 100) ÷ 100 × 100 | 20 |
| The price before 20% VAT was added to make 120 | 120 ÷ 1.2 | 100 |
| 1,000 growing 5% a year for 10 years | 1000 × (1 + 5%)^10 | 1628.89462678 |
The one people get wrong: taking a percentage back off
A price of 120 that includes 20% VAT was 100 before the tax, not 96. Adding 20% multiplies by 1.2, so taking it back off divides by 1.2: 120 ÷ 1.2 = 100. Typing 120 − 20% takes 20% of 120, which is 24, and gives 96. The same goes for any percentage that was added: divide by 1 plus the rate.
Order of operations: what gets worked out first
A sum with more than one operation is worked out in a fixed order, the one taught as BODMAS or BIDMAS in the UK and PEMDAS in the US. They are the same rule with different words:
- Brackets first, innermost out.
- Powers next. A chain of powers is worked from the right, so 2^3^2 is 2^9.
- Multiplication and division, as equals, from left to right.
- Addition and subtraction, as equals, from left to right.
| Sum | Answer | Why |
|---|---|---|
2 + 3 × 4 | 14 | The multiplication goes first |
(2 + 3) × 4 | 20 | The bracket goes first |
8 ÷ 2 × 4 | 16 | ÷ and × are equals, so left to right |
−3^2 | −9 | The power before the minus, as in written maths |
(−3)^2 | 9 | The bracket makes the minus part of the number |
2^3^2 | 512 | Powers from the right: 2^9 |
Why it asks for the ×
On paper, 2(3 + 4) means 2 × (3 + 4). This calculator asks you to type the ×, and says “Unexpected (” if you leave it out. That is deliberate: the sums that go round online as puzzles, such as 6 ÷ 2(1 + 2), are only puzzles because the hidden multiplication can be read two ways. Written out as 6 ÷ 2 × (1 + 2) there is one answer, 9.
Why 0.1 + 0.2 shows 0.3 here
Computers store most decimals as binary fractions, and 0.1 has no exact binary form, in the same way that one third has no exact decimal form. Add 0.1 and 0.2 in most programming languages and the result is 0.30000000000000004. Plenty of web calculators show you exactly that.
This one rounds every answer once, for display, to 12 significant digits. That is more than any everyday sum needs and fewer than the point where the binary noise appears, so 0.1 + 0.2 shows 0.3 and 1 ÷ 3 shows 0.333333333333.
- Very large or very small answers are shown in e notation:
1e21 × 10gives 1e+22, meaning 1 followed by 22 zeros. You can type e notation back in. - Dividing by zero says “Can’t divide by zero” rather than showing Infinity or a blank.
- Numbers with thousands separators can be pasted in: commas are ignored, so 1,250 reads as 1250.
Keyboard, carrying on and history
Everything on the keypad can be typed: click into the box and type the sum as you would write it.
| Key | Does |
|---|---|
| 0–9 . | Numbers and the decimal point |
| + - | Add, subtract |
| * or x | Multiply |
| / | Divide |
| ^ | Power: 2^10 is 1024 |
| % | Percent |
| ( ) | Brackets |
| Enter | Equals |
| Esc | Clear the sum |
The answer carries on
After equals, the answer stays in the box, so the next operation applies to it, as on a desk calculator: press = on 48.50 + 15%, then type ÷ 4 to split the bill four ways.
History
The last ten sums are listed under the calculator. Tap one to put it back in the box and change it. The list is kept in this browser’s local storage, on your device only, and Clear removes it. It never reaches a server.
Start from a count
Most of these calculations begin with a number you counted, so the counters are the natural first step.
Swimming. The lap counter keeps your lengths as you swim. Turning lengths into a distance depends on the pool, and our guide to counting laps in the pool explains why a 25-yard and a 25-metre pool give different totals.
Training. The rep counter tracks sets and reps. What those add up to is set out in reps and sets explained.
Surveys and votes. A tally becomes useful once it is a share of the whole: divide each option’s count by the total and multiply by 100. Tally marks explained covers reading one into a frequency table.
Venues and events. The people counter keeps separate in and out counts, and running a headcount at events covers turning them into an occupancy figure you can trust. The limit to hold it against comes from the occupancy calculator: floor area by use, checked against what the exits can take.
This calculator, a phone, a spreadsheet or a scientific calculator
Each of these will add up a bill. They differ in what they do with a percentage, what you can see while you type, and what they keep.
| This calculator | Phone calculator | Spreadsheet | Scientific calculator | |
|---|---|---|---|---|
200 + 10% gives | 220 | Usually 220 | 200.1 | Depends on the model |
| Whole sum visible while typing | Yes | Varies by app | Yes, in the cell | On most models |
| Brackets and powers | Yes | Often only in a scientific mode | Yes | Yes |
| Answer shown as you type | Yes | Some apps | After Enter | After = |
| Past sums kept | Last 10, on this device | Some apps | Every cell, in the file | Replay on many models |
| Install or account | None | Built in | A spreadsheet app | A device to carry |
| Best for | A quick sum at a computer or phone | A quick sum on the move | Many related sums, kept | Exams and trig, logs and stats |
All calculators
The specialist calculators on the site. Each one runs in your browser, needs no sign-up and sends nothing anywhere.
Counting & sport1
Calculators that start from a count: rest days after pitches, lengths in a swim, a tally as percentages.
Frequently asked questions
Is this online calculator free?
Yes. It is free with no limit, no sign-up and nothing to install, and so is every calculator on the site.
How do I work out a percentage of a number?
Multiply by the percentage: 80 × 15% gives 12, which is 15% of 80.
How do I add a percentage to a number?
Type the number plus the percentage: 48.50 + 15% gives 55.775. This calculator adds 15% of 48.50, as a pocket calculator does. A spreadsheet would read the same thing as 48.50 + 0.15.
How do I take a percentage off a price?
Type the price minus the percentage: 59.99 − 25% gives 44.9925, the price with 25% off.
How do I remove VAT from a price?
Divide by 1 plus the rate. For 20% VAT, 120 ÷ 1.2 gives 100. Subtracting 20% gives 96, which is wrong, because the 20% was added to the smaller price.
What order does the calculator work in?
Brackets, then powers, then multiplication and division from left to right, then addition and subtraction from left to right. This is the BODMAS or PEMDAS order taught in schools.
Why does 0.1 + 0.2 show 0.3 here and 0.30000000000000004 elsewhere?
Computers store 0.1 as a binary fraction that is very slightly off. This calculator rounds the answer once to 12 significant digits for display, which removes that noise without affecting any real result.
Why does 2(3 + 4) give an error?
The multiplication has to be typed: 2 × (3 + 4) gives 14. Asking for it means a sum can never be read two ways.
Does the calculator save my sums?
The last ten are kept in this browser’s local storage, on your device only, so they are there when you come back. Clear removes them. Nothing is sent to a server.
Can I use my keyboard?
Yes. Type digits and + - * / ^ % ( ), press Enter for the answer and Esc to clear.
Related guides
Where a count turns into a calculation: occupancy, distance, training volume, shares and scores.
- Events
How to do an accurate headcount
Counting people is easy. Counting them accurately, twice, is not.
- Surveys
How many people do you need to survey?
Why 385 answers a city and 45 answers a club, and the margin each sample size buys.
- Swimming
How to count laps while swimming
Why swimmers lose count at length 14, and five methods that actually hold up.
- Training
Reps and sets explained
What 10 reps and 3x10 mean, where 3 sets of 10 came from, and what the 2026 ACSM review changed.
- Tallying
Tally marks explained
Groups of five, the five-bar gate, and why the convention has survived for centuries.
- Golf
Stableford points and net scores
Stroke index, strokes received, net score, points — in the order you actually need them.