📊 Percentage Calculator

Percentage Calculator

A powerful, easy-to-use calculator for common percentage and interest calculations — all in one page.

1️⃣ % Change Calculator (Before → After)

Calculate the percentage change between two values.

Change in amount 0
Change in % (relative to Before) 0%
Use Cases: Price differences, income growth, performance comparison

2️⃣ Add or Subtract % on a Value

Find the new amount after increasing or decreasing a number by a percentage.

%
Increased value 0
Decreased value 0
Use Cases: Discounts, tax inclusion, profit margins

3️⃣ What is X% of Y?

Calculate the result when a percentage is applied to a number.

%
Guide Result = (X / 100) × Y
Result 0
Use Cases: Tips, commissions, taxes

4️⃣ X is What % of Y?

Find out what percentage one number is of another.

How to use Enter the Part (what you have) and the Whole (total). Percentage = (X ÷ Y) × 100
Percentage 0%
Use Cases: Test scores, comparisons, statistics

5️⃣ Simple Interest Calculator

Calculate interest over time using the simple interest formula.

%
Formula Interest i = (P × R × T) / 100 • Total = P + i
Interest earned 0
Monthly interest (simple) 0
Total amount 0
Use Cases: Loans, savings, personal finance

Tip Numbers update instantly. Use decimals. Switch languages at the top.