Math · Education
Percentage Calculator
Large inputs. Instant answer. Clear formula and steps — built for fast solving.
Solve
Pick a mode — answer updates live as you type.
Percentage
12.5%
25 ÷ 200 × 100 = 12.5%
- Divide part by whole: 25 ÷ 200 = 0.125
- Multiply by 100: 0.125 × 100 = 12.5%
How this calculator works
Use this percentage calculator to find what percent X is of Y, compute X% of Y, or measure percent change — with live steps as you type.
- Choose a mode: What % is X of Y?, X% of Y, or % change.
- Enter the two numbers.
- Read the answer, equation, and steps — they update live.
Formula
(part ÷ whole) × 100
Examples
More about this calculator
Practical use cases
- Exam scores — marks scored vs total marks.
- Discounts — how much off a MRP price.
- GST-style checks — what percent tax is of a bill (separate from the GST calculator).
Common mistakes
- Swapping part and whole (always divide the portion by the total).
- Forgetting that percent is already “per hundred” — don’t multiply by 100 twice.
Tips
- If the whole is zero, a percentage is undefined — enter a positive total.
- For shopping savings with currency amounts, also try the Discount calculator.
FAQs
Divide the part by the whole, then multiply by 100. Example: 25 ÷ 200 × 100 = 12.5%.
25% of 200 is 50. Switch to the “X% of Y” tab to compute amounts; the default tab answers “25 is what percent of 200?” (12.5%).
Yes. Enter marks obtained as Part and maximum marks as Whole.
Division by zero is undefined. Enter a positive total.
No — that finds an amount. “What % is X of Y?” finds the percent. Use the tabs above.