Solve any percentage problem: percent of a number, percent change, increase, decrease, and percentage points.
Percentages are a way to express a number as a fraction of 100.
Common Applications:
Quick Tips:
Common Tip Rates:
Remember that percentages are always calculated relative to the original amount unless specified otherwise.
Select from percent of a number, percent increase, percent decrease, percentage points, or tip calculation. Each mode is tuned for the most common use case.
Type the values relevant to your problem. The calculator auto-detects the right formula and shows the math step by step.
See the final answer plus the formula and the steps used. Useful for checking your own work or learning the underlying math.
For related calculations, try our tip calculator.
Cross-checked against authoritative formulas (IRS, NIST, ACM) and updated for 2025/2026 tax years and rates.
No server roundtrip. All math runs in your browser so results appear the moment you finish typing.
We never collect, store, or transmit your inputs. Every calculation runs locally in your browser.
Each calculator includes the formula, plain-English explanation, and FAQs so you understand the result.
Estimates only. Calculator results are for educational and planning purposes — not professional advice. For binding decisions on taxes, investments, health, or legal matters, consult a qualified professional.
FAQ
Everything you need to know about this calculator. Can't find what you're looking for? Email our team.
20% of $80 is $16. The formula: 80 x 0.20 = 16. Our percentage calculator does this in one click. The percentage calculator also handles reverse percentages (e.g. 16 is 20% of what number, answer: 80) and percentage change (e.g. 80 to 96 is a 20% increase).
How it works
Use the percentage calculator to find any percentage, percent change, discount, or tip in three steps.
Select what you want to compute: basic percentage, percent change, percent off (discount), or tip. Each mode has its own input fields.
Fill in the two numbers the calculation needs. For a discount, that is the original price and the discount percent. For a tip, that is the bill amount and tip percent.
The result appears immediately below the inputs, showing the computed value and a short explanation of what the numbers mean.
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