Percentage Calculator
Percentage Calculator
Solve all types of percentage problems.
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Percentage Calculator: Solve Any % Problem Instantly
Find % of a number, % change, reverse %, or increase/decrease — perfect for shopping, finance, grades, or stats. No rounding errors. Works in any unit.
Example: 20% of 150 = 30 | Price drops from $100 to $75 → -25% | Tip: 18% of $60 = $10.80.
5 Core Percentage Formulas
% of Number
(% × whole) / 100
Ex: 25% of 80 = 20
% Increase
((new - old) / old) × 100
Ex: $50 → $65 = +30%
% Decrease
((old - new) / old) × 100
Ex: $100 → $75 = -25%
Reverse %
(part / whole) × 100
Ex: 30 is what % of 150? = 20%
New Value After %
whole × (1 ± %/100)
Increase: 100 × 1.15 = 115 | Decrease: 100 × 0.85 = 85
Real-Life Examples
Shopping Discount
$200 shirt, 30% off → $140 (save $60)
Grades
Scored 42/50 → 84%
Business Growth
Sales: $10K → $12K → +20%
Restaurant Tip
$75 bill, 18% tip → $13.50
Pro Percentage Tips
Mental Math
- 10% = move decimal left
- 5% = half of 10%
- 1% = move decimal 2 places
Avoid Errors
- Don’t confuse % increase with new total
- Always use original for % change
- Round only at final step
Why Trust This Calculator?
Accuracy: Uses standard arithmetic rules — same as Excel, Google Sheets, and financial software.
Privacy: No data stored. Results vanish instantly.
Speed: JS-powered, works offline (PWA-ready).
Frequently Asked Questions
Ex: 25 out of 100 = 25%
Ex: 50 → 65 = +30%
Ex: $120 is 150% of what? → $80