Percentage Calculator — Fast & Free

1. What is X% of Y?

Percentage (%)

Of number

Result—

2. X is what % of Y?

Number (X)

Of number (Y)

Result—

3. Percentage Change

From

Change—

4. Add / Subtract a Percentage

Number

Percentage (%)

After adding %—

After subtracting %—

5. Reverse Percentage (find original value)

Final value

Percentage applied (%)

Original (before add %)—

Original (before sub %)—

ℹ️ How to use

Each section is a standalone calculator — just type your numbers and the result updates instantly.

Section 1: Find X% of any number
Section 2: What percent is one number of another
Section 3: Percentage increase or decrease
Section 4: Add or remove a percentage from a price
Section 5: Reverse — find the original value before a % was applied

🔗 Related Tools

Percentages in Daily Life — Where You Actually Need Them

Percentage calculations show up constantly in modern life, yet many people pull out a calculator and still get the formula wrong. Understanding the three core percentage operations — and knowing which one to use when — is one of the most practically useful bits of arithmetic you can master.

The Three Core Percentage Problems

"What is X% of Y?" → Used for: GST on a price, discount amount, commission, interest on a loan. Formula: (X ÷ 100) × Y. Example: 18% of ₹2,500 = ₹450.
"X is what percent of Y?" → Used for: Your marks out of total, profit margin, budget utilisation. Formula: (X ÷ Y) × 100. Example: 432 out of 600 = 72%.
"X increased/decreased by Y% — what's the new value?" → Used for: Salary hike, inflation, price change. Formula: X × (1 ± Y/100). Example: ₹50,000 salary with 12% hike = ₹50,000 × 1.12 = ₹56,000.

Percentage vs Percentage Points — A Common Confusion

If the repo rate goes from 6% to 6.5%, it increased by 0.5 percentage points — but by 8.33% in relative terms (0.5 ÷ 6 × 100). Journalists and economists are careful to say "50 basis points" or "0.5 percentage points" rather than "0.5%" to avoid this ambiguity. In casual conversation, this distinction is often ignored, which causes real misunderstandings in finance and policy discussions.

Percentage in Indian Exams

CBSE and most boards express marks as a percentage. A student scoring 432/600 has a percentage of 72%. For university admissions, many colleges require a minimum percentage (e.g., 60% in PCB for MBBS). Note that CGPA-to-percentage conversion varies by board — CBSE uses CGPA × 9.5, while some universities use their own multipliers.

Reverse percentage: If a price is ₹1,180 after 18% GST and you want the pre-GST price: it's NOT ₹1,180 − 18% = ₹967.6. The correct formula is ₹1,180 ÷ 1.18 = ₹1,000. Always divide, not subtract, when removing a percentage that was added.

❓ Frequently Asked Questions

How do I calculate 20% of a number?

Multiply the number by 0.20 (or 20/100). For example, 20% of 500 = 500 × 0.20 = 100. Or use Section 1 of this calculator: enter 20 in the percentage field and 500 in the number field.

How do I calculate percentage increase?

Percentage increase = ((New Value − Old Value) ÷ Old Value) × 100. For example, if a price goes from 200 to 250, the increase = ((250−200) ÷ 200) × 100 = 25%. Use Section 3 of this tool for instant results.

How do I calculate percentage discount?

Discounted price = Original price × (1 − discount% / 100). For a 30% discount on ₹800: 800 × 0.70 = ₹560. Use Section 4 of this calculator — enter the price and percentage, then read the 'After subtracting %' result.

How do I find the original price after a percentage increase?

If the final price includes a percentage increase, divide the final price by (1 + rate/100). For example, if ₹1,200 includes 20% tax: original = 1200 ÷ 1.20 = ₹1,000. Use Section 5 (Reverse Percentage) for this.

What is percentage vs percentile?

Percentage is a ratio expressed out of 100 (e.g. you scored 75%). Percentile indicates what percentage of the group scored below you (e.g. 90th percentile means you scored higher than 90% of people). They are different concepts.