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Calculator
Calculator
A fast, no-fuss calculator that works on any device. Ideal for everyday maths, quick percentage checks, and on-the-go arithmetic.
- Percentage & sign toggle
- Chained calculations
- Works offline in browser
- No app needed
0
C
+/−
%
÷
7
8
9
×
4
5
6
−
1
2
3
+
0
.
=
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What can this calculator do?
This is a standard arithmetic calculator supporting addition, subtraction, multiplication, and division. It also handles the percentage key (%) and sign toggle (+/−), and supports chained calculations. Results update instantly with no loading screens.
For more specialist financial calculations, try our mortgage calculator or BMI calculator.
How to calculate percentages
The % key converts the displayed number to its decimal form (divides by 100). Here are the most common percentage tasks:
| Task | Steps | Example |
|---|---|---|
| Find X% of a number | Enter number × X % | 200 × 15 % = 30 |
| Add VAT (20%) | Enter number × 1.2 = | 100 × 1.2 = 120 |
| Remove VAT (20%) | Enter number ÷ 1.2 = | 120 ÷ 1.2 = 100 |
| Percentage increase | (New − Old) ÷ Old × 100 | (130 − 100) ÷ 100 × 100 = 30% |
Common everyday uses
- Splitting a restaurant bill between several people
- Calculating a tip or service charge
- Working out discounts during a sale
- Adding or removing VAT on an invoice
- Quick unit price comparisons while shopping
- Checking change or verifying a receipt total
Frequently asked questions
How do I calculate a percentage on this calculator?
Enter the number, tap ×, enter the percentage, then tap %. For example, to find 15% of 200: press 200 × 15 % and the result is 30.
Can I do chained calculations?
Yes. Enter a number, choose an operator, enter the next number, and tap = to get the result. You can continue the chain without pressing C.
What does the +/− button do?
It toggles the sign of the current number — turning a positive number negative or vice versa. Useful for entering negative values in a calculation.
Does it work on mobile?
Yes — fully responsive. The button layout works on any smartphone or tablet browser without installing an app.
Why use an online calculator instead of the one on my phone?
The browser calculator is always one tab away when you're already working online — no need to switch apps. It's also shareable and consistent across any device you're logged into.
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