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Percentage Calculator & Formula Solver

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Calculate percentages, percentage increases, discounts, and differences with instant step-by-step mathematical formulas.

1. Percentage of a Value

What is % of ?

Result: 18

                Formula: (15 ÷ 100) × 120 = 18
            

2. Portion Ratio

is what % of ?

Percentage: 12.5%

                Formula: (25 ÷ 200) × 100 = 12.5%
            

3. Percentage Change (Increase/Decrease)

From to is:

Change: +50% (Increase)

                Formula: ((75 - 50) ÷ 50) × 100 = +50%
            

4. Add / Subtract Percent (Tax / Discount)

Final Value: 120

                Formula: 100 + (100 × 0.20) = 120
            

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Direct In-Browser Handoff

Chain this tool with complementary private browser utilities for a complete zero-server workflow:

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Helpful Examples

Basic Percentage

What is 15% of 200?

How to Use the Percentage Calculator & Formula Solver

Solve common percentage problems instantly. Calculates 'What is X% of Y', 'X is what % of Y', percentage change/difference, and percentage addition/subtraction with step-by-step formulas.

Privacy & Data Processing Notice

No user data leaves your browser. Computation is executed entirely on your device. We do not store, view, or transmit your inputs over our network. Your computation remains on your personal machine.

Frequently Asked Questions

How to calculate percent change?

((New Value - Old Value) / Old Value) * 100.

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