Are these calculators really free?

Yes, all our calculators are completely free to use. No registration, no hidden fees, and no limitations on usage.

How accurate are the calculations?

Our calculators use standard mathematical formulas and are tested for accuracy. Results are precise and reliable for most practical applications.

Absolutely! All our calculators are fully responsive and work perfectly on smartphones, tablets, and desktop computers.

No, we don't store any of your input data. All calculations are performed locally in your browser for privacy and security.

Find percentage difference between two values and percent change from the first.

First value

Second value

Percentage difference (vs. the average) is useful when neither value is clearly the “old” or “new” baseline:

|a − b| ÷ ((|a| + |b|) / 2) × 100%

Percent change from the first value treats the first box as the baseline:

(b − a) ÷ |a| × 100%

If the first value is zero, percent change from first is undefined (division by zero).

Calculate percentages, find percentage of numbers, and convert between decimals and percentages.

Calculate the percentage increase between two numbers. Find how much a value has grown from original to new.

Calculate the percentage decrease between two numbers. Find how much a value has dropped from original to new.