Percentage Calculator

Calculate percentages with three powerful modes — find X% of Y, find what % X is of Y, or calculate % change.

Choose a Mode

Select calculation type below

Percentage (X)

Number (Y)

Part (X)

Total (Y)

Original Value

New Value

Result

Increase Decrease No Change

Visual Representation

Formula & Calculation

Formulas

Mode 1: X% of Y

Result = Y × X / 100

Mode 2: X is ?% of Y

Result = (X / Y) × 100

Mode 3: % Change

Change = ((New − Old) / |Old|) × 100

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Pro Tips

Quick trick: To find 10% of any number, just move the decimal point one place to the left.

To find 25%, divide by 4. To find 50%, divide by 2. To find 75%, find 50% + 25%.

Percentage change is always relative to the original value, not the new value.

Use the quick presets in Mode 1 for common percentages like tips and discounts.