Is the % Difference free to use?

Yes, the % Difference is completely free. There is no sign-up, no account required, and no limit on how often you can use it.

How accurate is the % Difference?

The % Difference uses standard mathematical formulas and produces results accurate to standard precision. For critical applications, always verify with an authoritative source.

What devices does the % Difference work on?

The % Difference works on any device with a modern web browser — desktop, laptop, tablet, or phone. It is mobile-friendly and works offline once the page has loaded.

🔢 Number Tools

Percentage Difference Calculator

Calculate the percentage difference, increase or decrease between two numbers. Shows formula and steps. Free.

The % Difference is a free online tool that helps you calculate the percentage difference, increase or decrease between two numbers. shows formula and steps. free It runs in your browser with no sign-up, downloads, or installation needed. All processing happens locally — your data stays on your device.

Original / first value

New / second value

How to use the % Difference

Three measures explained

% change = (new − old) ÷ old × 100. Use when one value is "before" and the other "after". % difference = |a − b| ÷ ((a+b)/2) × 100. Symmetric — works when neither value is the reference. % of = (a ÷ b) × 100. What proportion one number is of another.

Example: salary rise

If your salary went from £30,000 to £33,000, that's a 10% increase: (33000 − 30000) ÷ 30000 × 100 = 10%. The percentage difference (symmetric) would be different: |33000 − 30000| ÷ 31500 × 100 = 9.52%.

💡 Affiliate links below. As an Amazon Associate we earn from qualifying purchases at no extra cost to you.

⭐ Top pick · Recommended on Amazon