Percentage Calculator
Calculate percentages instantly: percentage of a number, percentage change, and what percent X is of Y.
📋 How to Use
- Select the calculation mode from the available options (percentage of a number, percentage change, etc.).
- Enter the required values in the input fields.
- Click Calculate — the result appears instantly with a step-by-step explanation.
- View the formula used and how the calculation was performed.
- Use the result in your work or share the calculation details.
About This Tool
Percentage Calculator — Solve Any Percentage Problem Instantly
Percentages are everywhere — from sales discounts to exam scores, tax calculations to investment returns, tip amounts to nutritional values. Our Percentage Calculator solves every common percentage problem instantly with clear results and explanations.
Calculation Modes
Mode 1 — Percentage of a number: "What is X% of Y?"
- Example: What is 15% of 250? → Answer: 37.5
- Used for: calculating tips, discounts, tax amounts, commissions.
Mode 2 — What percent is X of Y?: "X is what % of Y?"
- Example: 30 is what % of 150? → Answer: 20%
- Used for: exam scores, completion percentages, market share calculations.
Mode 3 — Percentage change: "What is the % increase/decrease from X to Y?"
- Example: From 80 to 100 → Answer: 25% increase
- Used for: sales growth, price changes, year-over-year comparisons, investment returns.
Mode 4 — Find the original value: "X is Y% of what number?"
- Example: 40 is 25% of what? → Answer: 160
- Used for: reverse price calculations, finding pre-discount prices.
Mode 5 — Add/subtract percentage: "X + Y%" or "X - Y%"
- Example: 200 + 15% → Answer: 230
- Used for: price increases, markup calculations, VAT/GST additions.
Practical Applications
Shopping: Calculate how much you save with a 30% off discount. Find the final price after VAT is added. Compare sale prices across items.
Finance: Calculate investment returns, interest amounts, or portfolio percentage allocations. Determine what percentage of income is spent on housing.
Education: Convert raw scores to percentages. Calculate grade percentage changes. Determine what percentage of questions were answered correctly.
Business: Calculate profit margins, markup percentages, year-over-year revenue growth, or customer conversion rates.
Health: Calculate what percentage of daily caloric intake a meal represents. Determine BMI improvement percentages or weight loss progress.
Understanding Percentage Calculations
A percentage is simply a fraction expressed out of 100. "25%" means 25 out of every 100, or the fraction 25/100 = 0.25. The key to percentage calculations is understanding the relationship between the part, the whole, and the rate:
- Part = Whole × Rate/100
- Rate = (Part / Whole) × 100
- Whole = Part / (Rate/100)
Solve all your percentage calculations now — free and instant.