Calculators
Percentage, BMI, loan EMI, tip, and interest calculators — all computed instantly in your browser.
Five everyday calculators — percentage, BMI, loan EMI, tip splitting, and simple/compound interest — with instant results as you type, no ads interrupting the page, and nothing you enter is stored or sent anywhere.
X% of Y
X is what % of Y
Increase / decrease Y by X%
How to use this tool
- 1Pick the calculator you need: "X% of Y", "X is what % of Y", or "Increase/decrease Y by X%".
- 2Enter the two numbers into the fields for that calculator.
- 3For the increase/decrease calculator, choose the Increase or Decrease button to set the direction.
- 4The result updates instantly as you type — no submit button needed.
Frequently asked questions
How is "X% of Y" calculated?
It's (X ÷ 100) × Y. For example, 10% of 200 is (10 ÷ 100) × 200 = 20.
How is "X is what % of Y" calculated?
It's (X ÷ Y) × 100. This tells you what percentage one number represents of another.
What's the difference between increasing by 10% and decreasing by 10%?
Increasing multiplies Y by (1 + X/100); decreasing multiplies Y by (1 − X/100). They give different results because the percentage is always taken of the original Y, not the changed value.
Is my data sent anywhere?
No. All three calculators run entirely in your browser with plain JavaScript — nothing you type is uploaded or stored.