➗ Percentage Calculator

Calculate percentages easily — what percent of a number, percentage change, and more.

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What is a Percentage Calculator?

A Percentage Calculator is a multi-mode tool that solves the three percentage problems people run into most often: figuring out what percentage one number represents of another, working out a percentage of a given value, and measuring how much a number has increased or decreased in percentage terms. Instead of switching formulas in your head, you simply pick the mode you need from the dropdown and enter your two numbers.

The Three Calculation Modes

Mode 1 — "What % is A of B?"

Use this when you know two numbers and want to express the first as a percentage of the second — for example, marks scored out of total marks.

Percentage = (A ÷ B) × 100
Example: A = 456, B = 600 → (456 ÷ 600) × 100 = 76%

Mode 2 — "What is X% of Y?"

Use this when you already know a percentage rate and want to find the actual value it represents — for example, a bank interest rate applied to a deposit.

Value = (X ÷ 100) × Y
Example: X = 8%, Y = ₹1,00,000 → (8 ÷ 100) × 1,00,000 = ₹8,000

Mode 3 — "% Change from Old to New"

Use this to measure growth or decline between two values, such as a salary revision or a change in monthly expenses.

% Change = ((New − Old) ÷ Old) × 100
Example: Old = ₹40,000, New = ₹46,000 → ((46,000 − 40,000) ÷ 40,000) × 100 = 15% increase

If the new value is smaller than the old value, the result is shown as a percentage decrease instead — the calculator automatically labels the direction of change based on the sign of the result.

How to Use This Percentage Calculator

  1. Choose a calculation type from the dropdown: "What % is A of B", "What is X% of Y", or "% Change from Old to New".
  2. Fill in the two number fields that appear for the selected mode.
  3. Click Calculate to see the result along with a plain-language explanation of what it means.

Common Real-Life Uses in India

  • Exam and marksheet percentages: Scored 456 out of 600 in board exams? Use Mode 1 to instantly get 76%.
  • Shopping discounts: A ₹2,500 jacket at "30% off" — use Mode 2 to find the exact amount knocked off before checkout.
  • Salary or fee hikes: Compare your old and new salary, rent, or school fee using Mode 3 to see the exact percentage jump.
  • Investment returns: Check how much a mutual fund or FD investment has grown in percentage terms between two dates.
  • Tax and GST context: Percentages sit behind every GST slab and TDS rate — for the specific CGST/SGST split and add/remove-GST workflow, see our dedicated GST Calculator.
💡 Quick Trick: To estimate 10% of any number instantly, just move the decimal point one place left — ₹2,500 becomes ₹250. Double it for 20%, halve it for 5%, and combine these to estimate almost any percentage in your head.

Looking specifically for a shopping discount breakdown? Try the Discount Calculator. Need to average a list of numbers instead? Use the Average Calculator.

📅 Last reviewed: July 2026 · Formulas verified against RBI/SEBI/IT Dept guidelines.