📈 Percentage & Discount Calculator

Five interactive calculators for all everyday percentage problems. Calculate discounts, markups, tax, ratios, and percentage differences with live formulas.

1. Percentage of a Value

What is % of ? 12
Formula: (15 / 100) × 80 = 12

2. Common Ratio Percentage

is what percent of ? 12.5%
Formula: (25 / 200) × 100 = 12.5%

3. Percentage Change (Increase / Decrease)

What is the percentage change from to ? +50%
Formula: ((75 - 50) / 50) × 100 = +50%

4. Sale & Discount Calculator

Original Price: $ with % Off = Final: $90.00 (Save $30.00)
Formula: 120 - (120 × 0.25) = $90.00

5. Add Percentage (Markup, Sales Tax & Tip)

Add % tax / markup to $ = Total: $54.25
Formula: 50 + (50 × 0.085) = $54.25

How to use Percentage Calculator

Choose the calculation that matches your question and enter the base values. Check whether you need a percentage of a number or a percentage change.

What to check before using the result

Percentage change is relative to the original value. A zero original value makes the usual change formula undefined.

Example: Working out a sale price

A 25% discount on 120 saves 30 and leaves 90. A rise from 50 to 75 is a 50% increase. Percentage change from zero is undefined, so choose the original value carefully.

Free to use; no account required. For browser requirements and processing limits, read the ToolsHub FAQ. See how local processing works in our privacy policy.