Percentage Calculator
Calculate percentages, discounts, and percentage changes.
Percentage Calculator
About Percentage Calculator
Calculate percentages, discounts, and percentage changes. This calculator provides instant, accurate results right in your browser — no downloads, no accounts, no ads.
Simply fill in the required fields above and click calculate. You can copy your results or use the shareable result card to save your work.
Frequently Asked Questions
How do you calculate percentage?
Divide the part by the whole and multiply by 100. For example, 30 out of 200 = (30/200) × 100 = 15%.
What is a percentage increase formula?
Percentage increase = ((new value - old value) / old value) × 100. If sales went from 100 to 120, that's a 20% increase.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. E.g., 25 is what % of 80? (25/80) × 100 = 31.25%.
Can I use this for discounts?
Yes! Use "What is X% of Y?" to find discount amounts, or "Decrease by X%" to find final prices after discounts.