Percentage Calculator

Runs in your browserCalculators#Math#Business

Work out X% of Y, marks percentage, percentage change, increases, and the value before GST.

What is X% of Y?

For example, 18% GST on ₹2,500.

45018% of 2,500 is 450.

X is what percent of Y?

For example, marks: 412 out of 500.

82.4%412 is 82.4% of 500.

Percentage change from A to B

For example, a salary that went from ₹40,000 to ₹46,000.

+15%40,000 to 46,000 is a 15% increase (+6,000).

Increase or decrease by a percentage

For example, ₹40,000 plus a 10% raise.

44,00040,000 increased by 10% is 44,000 (+4,000).

Reverse percentage: find the original value

For example, a price of ₹2,950 that includes 18% GST, or a sale price after 20% off.

2,5002,950 including 18% was 2,500 before; the 18% part is 450.
How to use, limits & privacy

About Percentage Calculator

Answer the five everyday percentage questions in one place: X% of a number, what percent one number is of another (such as marks out of a total), the percentage change from one value to another, a number increased or decreased by a percentage, and the original value before a percentage was added or taken off (such as a price before GST). Every answer updates as you type and can be copied. It runs in your browser.

How to Use

1

Pick the question

Each card answers one question, such as "What is X% of Y?" or "X is what percent of Y?". The cards start with worked examples.

2

Type your numbers

Replace the example values. You can type commas, as in 1,50,000. For the increase, decrease and reverse cards, choose the direction first.

3

Read and copy the answer

The answer and a sentence explaining it appear next to the inputs. Press Copy to copy the number, or Reset examples to start again.

Privacy & Processing

  • Mode: local
  • Files Leave Browser: Local tool processing; review details below
  • Max Input Size: Device memory limits
  • Account Required: No
  • Data Stored Locally: Nothing is saved; the examples come back when you reload the page.
  • Network Processing: Assets or models may require an initial download

Everything is calculated in your browser. Nothing you type is sent to a server.

Rules & Limitations

  • Answers are rounded to 2 decimal places (more for very small numbers).
  • A percentage change from 0, or a percentage of a total of 0, is shown as "Not defined" because it would mean dividing by zero.
  • Percentage change is measured against the size of the starting value, so a move from -100 to -50 is a 50% increase.
  • Margin and markup are in the Discount & Margin Calculator.

Top Suggestions

  • Working out the percentage of marks in an exam
  • Checking a salary hike or a price rise as a percentage
  • Finding the price before GST from a GST-inclusive bill
  • Adding or removing a percentage from an amount
  • Finding the original price from a sale price

Percentage Calculator FAQ

How do I calculate the percentage of marks?

Divide the marks you scored by the maximum marks and multiply by 100. For 412 out of 500, that is 412 ÷ 500 × 100 = 82.4%. Enter the marks in Value and the maximum in Total on the "X is what percent of Y?" card.

How do I calculate the price before GST from a GST-inclusive price?

Divide the price by 1 plus the GST rate. For ₹2,950 including 18% GST, that is 2,950 ÷ 1.18 = ₹2,500, so the GST is ₹450. Use the "Reverse percentage" card with "Was added" selected.

How do I calculate a percentage increase?

Subtract the old value from the new one, divide by the old value and multiply by 100. A salary going from ₹40,000 to ₹46,000 is (46,000 - 40,000) ÷ 40,000 × 100 = 15%.

Why is a 20% discount not undone by adding 20%?

Because the second percentage is taken of a different number. ₹1,000 less 20% is ₹800, and ₹800 plus 20% is ₹960. To find the original price from a sale price, use the "Reverse percentage" card with "Was taken off".

What is the difference between percentage and percentage points?

A percentage point is the plain difference between two percentages, while a percentage change compares them. A rate going from 10% to 12% rises by 2 percentage points, which is a 20% increase.

Are my numbers sent anywhere?

No. All calculations happen in your browser, and nothing you type is uploaded or stored.

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