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Percentage Calculator

Percentage Calculator is part of Toolspire and is ready as soon as this page loads. Nine everyday percentage questions on one page — each answered as you type, with the working shown so you can check it or learn the method.

Runs in this tabFreeNo account

On this page

What you can do here

All on one page

No hunting for the right mode — every common percentage sum is here.

Shows the steps

The formula with your numbers in it, under each answer.

Marks calculator

Total percentage across subjects for report cards and results.

Reverse percentages

Find the price before GST or before a discount.

Copy the answer

One click copies the plain number.

Phone friendly

Large inputs and a number keypad on mobile.

The sequence

How to calculate a percentage

  1. 1

    Find your question

    Pick the card that matches — for example “What is 15% of 200?”.

  2. 2

    Type the numbers

    Replace the sample numbers with yours.

  3. 3

    Read the answer

    It appears immediately, with the working underneath.

Worth knowing

  • Percentage Calculator on Toolspire: answers nine percentage questions: X% of a number, X as a percent of Y, percentage increase or decrease, increase or decrease by a percent, finding the whole, discounts, the value before a change, percentage difference and marks percentage.
  • Every answer comes with its working — for example 15 ÷ 100 × 200 = 30 — so you can follow the method.
  • Updates as you type; there is no button to press.
  • Marks percentage adds up any number of subjects with different maximum marks.
  • Reads numbers with commas (1,25,000 or 125,000), ₹, $ and % signs.
  • Runs entirely in this tab — nothing you type is uploaded.

Percentage formulas

QuestionFormulaExample
What is P% of X?P ÷ 100 × X15% of 200 = 30
X is what percent of Y?X ÷ Y × 10030 of 200 = 15%
Percentage change from A to B(B − A) ÷ A × 10080 → 100 = 25% increase
X increased by P%X × (1 + P ÷ 100)200 + 10% = 220
X is P% of what?X ÷ (P ÷ 100)30 is 15% of 200
Price after P% offPrice × (1 − P ÷ 100)2,000 − 20% = 1,600
Value before a P% increaseValue ÷ (1 + P ÷ 100)118 before 18% = 100
Marks percentageMarks obtained ÷ Total marks × 100450 of 500 = 90%

Percentage change is not symmetric

Going from 80 to 100 is a 25% increase, but going back from 100 to 80 is a 20% decrease — the change is always measured against the starting value. That is also why a 50% loss needs a 100% gain to recover. When neither number is the “start”, use the percentage difference, which measures the gap against their average.

FAQ

Questions about Percentage Calculator

Where does Percentage Calculator run?

Percentage Calculator runs in this tab on Toolspire. What you type or drop in is not sent to us and is not stored on a server.

How do I calculate a percentage of a number?

Divide the percentage by 100 and multiply by the number. 15% of 200 is 15 ÷ 100 × 200 = 30.

How do I calculate my marks percentage?

Divide the marks you got by the total marks and multiply by 100. For 450 out of 500: 450 ÷ 500 × 100 = 90%. Use the Marks percentage card to add several subjects.

How do I calculate percentage increase?

Subtract the old value from the new one, divide by the old value and multiply by 100. From 80 to 100: (100 − 80) ÷ 80 × 100 = 25%.

How do I find the original price before GST or a discount?

Divide by (1 + rate ÷ 100) for an increase such as GST, or by (1 − rate ÷ 100) for a discount. ₹118 including 18% GST was ₹118 ÷ 1.18 = ₹100. Use the Original value before a % change card.

What is the difference between percentage change and percentage difference?

Percentage change compares a new value with an old one. Percentage difference compares two values with no “before” and “after”, dividing the gap by their average.

Is anything I type stored?

No. All calculations happen in this tab.

Keep going

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