Percentage Calculator Online Free

How to use the percentage calculator

Pick the kind of question you are asking, enter the numbers, and read the answer. The modes cover the calculations people actually need rather than one generic box.

The four questions this answers

What is X% of Y? The everyday case, such as a tip, a discount or a commission. Multiply Y by X and divide by 100.

X is what percent of Y? Turning two raw figures into a proportion: a score out of a total, a spend against a budget.

Percentage increase or decrease. The change divided by the original value. This is where mistakes creep in, because dividing by the new value instead produces a plausible-looking but wrong answer.

Reverse percentage. Working backwards from a figure that already includes a change, such as recovering the pre-discount price from the sale price, or the pre-tax amount from a total.

The trap worth remembering

Percentage changes do not cancel out. A price that falls 20% and then rises 20% does not return to where it started: ₹100 becomes ₹80, and 20% of ₹80 is ₹16, so you end at ₹96. The second percentage is calculated on a different base. The same asymmetry explains why an investment that loses 50% needs a 100% gain to recover, and why "our costs rose 10% but we cut them 10%" is not the good news it sounds like.

Frequently asked questions

What is the difference between percent and percentage points?

If a rate moves from 5% to 7%, that is a rise of two percentage points but a 40% increase. Financial reporting depends on the distinction.

How do I calculate a discount?

Use "X% of Y" for the saving, or the reverse mode when you know the final price and want the original.

Is my data sent anywhere?

No. Everything is computed in your browser.