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Percentage Calculator

Calculate percentages, increases, decreases, and %-of.

Introduction

Percentage Calculator — Calculate percentages, increases, decreases, and %-of. Enter X (%), Of Y, A is what % of B — A, A is what % of B — B, % change — original, % change — new to get an instant, accurate result.

Formula

X% of Y = (X/100) × Y. A is what % of B = (A/B) × 100. Percent change = ((New − Original)/Original) × 100.

Step-by-step

  1. Enter the X (%).
  2. Enter the Of Y.
  3. Enter the A is what % of B — A.
  4. Enter the A is what % of B — B.
  5. Enter the % change — original.
  6. Enter the % change — new.
  7. Click Calculate to see your result instantly.

Real-world example

Example: With X (%) = 15, Of Y = 200, A is what % of B — A = 50, A is what % of B — B = 200, % change — original = 100, % change — new = 130, the Percentage Calculator gives X Percent Of Y: 30, A Is Percent Of B: 25, Percent Change: 30.

Frequently Asked Questions

How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100 — the "A is what % of B" section does this for you.
How is percent change calculated?
As the difference between the new and original values, divided by the original value, expressed as a percentage. A negative result means a decrease.
What inputs does the Percentage Calculator need?
You'll need to provide: X (%), Of Y, A is what % of B — A, A is what % of B — B, % change — original, % change — new. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Percentage Calculator?
The Percentage Calculator applies the formula exactly as calculated — X% of Y = (X/100) × Y. A is what % of B = (A/B) × 100. Percent change = ((New − Original)/Original) × 100. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Percentage Calculator free to use?
Yes, the Percentage Calculator is completely free, requires no signup, and runs instantly in your browser.

About the Percentage Calculator

The Percentage Calculator uses a real, verifiable formula — X% of Y = (X/100) × Y. A is what % of B = (A/B) × 100. Percent change = ((New − Original)/Original) × 100. — so results are accurate every time, not an approximation.