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Percentage Calculator Online Free

Quickly calculate percentages, percentage changes, ratios, retail discounts, sales tax, and markups with instant live results.

1. Percentage of a Number

What is P% of a given number?

What is % of ?
Result
30
15% × 200 = 30

2. Percentage Ratio

X is what percentage of Y?

is what % of ?
Result
25%
(25 ÷ 100) × 100 = 25%

3. Percentage Increase / Decrease

Calculate percentage change from Old to New value.

From to
Result
+50% (Increase)
Difference: +25 on base of 50

4. Discount & Sales Tax (±%)

Add tax/markup or deduct discount from total.

%
Final Amount
96
Subtracted 24 (20%)

Understanding Common Percentage Formulas

Percentages are a fundamental mathematical concept used across commerce, taxation, academic grading, loan interest, and retail shopping. ToolNovus offers live arithmetic calculations with zero page reloads.

1. Percentage of a Value Formula:

Percentage = (P ÷ 100) × Total Value

Example: To calculate a 15% tip on an $80 restaurant bill: (15 ÷ 100) × 80 = $12 tip.

2. Percentage Difference / Increase Formula:

Percentage Change = ((New Value - Original Value) ÷ Original Value) × 100

If your website traffic increases from 1,000 visitors to 1,500 visitors, your percentage increase is ((1500 - 1000) ÷ 1000) × 100 = +50% growth.