Percentage Calculator – Fast & Accurate
Use this free percentage calculator to find percent of a number, what percent one value is of another, percentage increase or decrease, and % change with instant step-by-step working.
Choose Mode & Enter Values
Pick a mode, then fill the fields below.Formulas Used
- Find X% of Y: (X × Y) ÷ 100
- What percent is A of B: (A ÷ B) × 100
- Increase Y by X%: Y × (1 + X/100)
- Decrease Y by X%: Y × (1 − X/100)
- % Change: ((New − Old) ÷ Old) × 100
FAQs
Can I use decimals and negatives?
Yes. The calculator accepts decimals and negatives. Interpret negative percentages carefully.
Why is my answer slightly different?
We round to 4 decimal places for readability. You can change precision inside the script.
What’s “what percent” vs “percent of”?
“Percent of” finds a portion of a whole. “What percent” finds the ratio of part to whole as a percentage.
Where Can You Use This Percentage Calculator?
This percentage calculator is useful in many day-to-day situations where you need quick and accurate percent values. Here are some common places where it can save your time and avoid mistakes.
Shopping Discounts & Online Sale Offers
Quickly check how much you really save on 20%, 50% or 70% off sale offers and what the final price will be after the discount.
School, College & Exam Percentage
Convert marks into percentage, compare subject scores, and calculate overall result or improvement between two exams.
Salary Hike, Bonus & Deductions
Use it to find percentage increase in salary, bonus amount from basic pay, or how much a PF or tax deduction is in percent.
Business Profit, Loss & Margin
Calculate profit or loss percentage on products, check margin between cost price and selling price, and analyse simple reports.
Interest, EMI & Investment Growth
Estimate how much interest you pay or earn, track percentage growth in savings, or check change in mutual fund and stock values.
Reports, Surveys & Everyday Numbers
Turn raw numbers into easy-to-understand percentages for reports, surveys, attendance, or any daily calculation you want to compare.
Percentage Calculator – FAQ
This percentage calculator helps you handle the most common percent tasks in one place. You can quickly find percents, increases, decreases, and percentage change for study, shopping, or business work.
To find X% of Y, multiply Y by X and divide the result by 100. For example, 18% of 250 is 18 × 250 ÷ 100, which equals 45.
Use the formula (A ÷ B) × 100 when you want to know what percent A is of B. In the “What percent is A of B?” mode, the percentage calculator runs this formula and shows the result instantly.
For a percentage increase, multiply the original value by (1 + X/100). To calculate a decrease, multiply the same value by (1 − X/100) instead.
Percentage change compares how far a value moves from old to new. Calculate it as ((New − Old) ÷ Old) × 100, where a positive answer shows an increase and a negative answer shows a decrease.
Yes, the percentage calculator accepts decimal numbers and negative values when needed. It also uses a mobile-first layout, so it works smoothly on phones, tablets, and desktop screens.
