6 Calculation Modes · Instant · Free

Percentage
Calculator

Six powerful percentage calculation modes — from basic percentages to growth rates, markup, and reverse calculations.

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Enter values and calculate
of
Formula: Result = (Percentage ÷ 100) × Value
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Enter values and calculate
÷
Formula: % = (X ÷ Y) × 100
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Percentage change
→
Formula: % Change = ((New − Old) ÷ Old) × 100
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Value after percentage added/removed
Formula: Result = Value × (1 + Percentage / 100)
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Original value before percentage applied
Formula: Original = Final ÷ (Percentage / 100)
Use: "120 is 80% of what number?"
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Percentage difference between two values
vs
Formula: Diff = |A − B| ÷ ((A + B) / 2) × 100

Every Percentage Calculation

Six modes cover every real-world percentage scenario

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Instant Results

Results update as you type — no button press needed.

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6 Modes

Basic percent, what %, percent change, add/subtract %, reverse %, and difference.

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Formulas Shown

Every mode displays the math formula so you can learn and verify.

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Mobile Friendly

Works perfectly on any device — no app download required.

How It Works

Pick your mode, get your answer

1

Choose Mode

Select from 6 calculation types at the top.

2

Enter Values

Type in your numbers — results appear instantly.

3

Read Formula

The math formula is always shown below.

Frequently Asked Questions

What is the reverse percentage mode?
It answers: "120 is 80% of what number?" Enter the final value (120) and the percentage (80), and it calculates the original value (150).
What is percentage difference vs percentage change?
Percentage change tracks movement from an original to a new value (directional). Percentage difference compares two values without a direction, using their average as the base.