Percentage Calculator
Calculate percentages, percentage increases, decreases, and differences with step-by-step explanations
1. What is X% of Y?
2. X is what % of Y?
3. Percentage Increase / Decrease
4. Increase / Decrease X by Y%
Free Percentage Calculator with Multiple Formulas
Percentages are a fundamental part of everyday math, from calculating discounts and tax rates to tracking growth metrics and comparing statistics. Our Percentage Calculator provides four essential calculation types in one place, each with a step-by-step explanation so you understand not just the answer, but the underlying math.
Use Cases for Each Calculator
Type 1 (X% of Y): Perfect for calculating discounts (e.g., 20% off $150), tax amounts, or tips. Type 2 (X is what % of Y): Great for finding test scores, conversion rates, or market share percentages. Type 3 (Increase/Decrease %): Ideal for tracking sales growth, price changes, or performance changes. Type 4 (Adjust by %): Useful for applying raises, discounts, or interest to a base value.
Tips for Percentage Calculations
Remember that percentage calculations are multiplicative, not additive. A 50% increase followed by a 50% decrease does not return to the original value — it results in a 25% net decrease. This is why comparing percentage changes requires careful consideration of the base value used for each calculation. Our tool always shows you the exact formula used so you can verify the logic.