Percentage Calculator
Calculate percentages, percentage increases, percentage decreases, and differences easily.
Solve any percentage problem in seconds. Calculate percentage of a number, percentage increase or decrease between two values, find the whole from a part, or determine what percent X is of Y.
About Percentage Calculator
Percentages are used daily across personal finance, retail sales, business analytics, tax calculations, and academic coursework. Percentage Calculator eliminates math errors and saves time by delivering instant, verified percentage breakdowns.
How to Use Percentage Calculator
- Choose calculation type: Select whether you want to find a percentage, calculate increase/decrease, or reverse calculate.
- Enter your values: Type the numbers into the designated input fields.
- View instant results: The exact percentage calculation and intermediate steps update dynamically.
- Copy or reference formula: Copy the result or read the mathematical formula breakdown for your records.
Key Features
- Calculate percentage of value
- Percentage increase/decrease
- Find original value from percentage
- Ratio to percentage conversion
- Step-by-step math formulas
Common Use Cases
- Calculating discounts and final prices during retail shopping.
- Analyzing year-over-year revenue and growth metrics for business reports.
- Checking test scores, grades, and academic curves.
- Determining tip amounts, sales tax additions, and commission payouts.
Formula & Calculation Logic
Percentage Formula: Percentage = (Part / Total) × 100. Percentage Change = ((New Value - Initial Value) / Initial Value) × 100.
Frequently Asked Questions
How do you calculate percentage increase?
Subtract the original value from the new value, divide the difference by the original value, and multiply by 100: ((New - Old) / Old) * 100.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100: (Part / Whole) * 100.
Can this calculator handle decimal percentages?
Yes, our percentage calculator supports unlimited precision with decimals like 3.75% or 0.05%.
Is this calculator free to use for homework and business?
Yes, 100% free with no registration or limits.
Privacy Guarantee
All mathematical computations execute in client-side JavaScript. No inputs or figures are logged.
Related Free Online Tools
Discount Calculator
Calculate sale savings, final clearance prices, and stacked coupon discounts.
Use Discount Calculator →Tip Calculator
Calculate restaurant tips, bill totals, and split the check evenly among friends.
Use Tip Calculator →Sales Tax Calculator
Calculate state and local sales tax, pre-tax subtotals, and total purchase prices.
Use Sales Tax Calculator →Compound Interest Calculator
Calculate compound interest growth on savings, retirement funds, and investments over time.
Use Compound Interest Calculator →Simple Interest Calculator
Calculate simple interest, total repayment, and annual returns on short-term loans and bonds.
Use Simple Interest Calculator →Loan Calculator
Calculate monthly loan payments, total interest cost, and amortization schedules.
Use Loan Calculator →