Percentage Calculator
Calculate percentages instantly — what is X% of Y? X is what % of Y? Percentage increase/decrease.
Calculate →Tip Calculator
Split the bill easily. Calculate tips by percentage, divide among friends, round up or down.
Calculate →BMI Calculator
Calculate your Body Mass Index using metric or imperial units. Understand your weight category.
Calculate →Loan Calculator
Estimate monthly payments for any loan — mortgage, auto, personal. See total interest paid.
Calculate →Discount Calculator
Find the final price after any discount. Calculate savings on sales, coupons, and deals.
Calculate →Unit Converter
Convert between common units — length, weight, temperature, volume. Quick and accurate.
Convert →📎 Recommended Office & Productivity Supplies
Free Online Calculators for Everyday Use
Whether you're splitting a dinner bill, checking your BMI, or planning a loan repayment, our free online calculators give you instant, accurate results. No apps to download, no accounts to create — just type your numbers and get answers.
All calculators work on desktop and mobile. Your data stays in your browser — nothing is sent to any server. We respect your privacy completely.
How do I calculate a percentage?
To find what X% of a number is, multiply the number by X and divide by 100. For example, 15% of 200 = (200 × 15) ÷ 100 = 30. Our percentage calculator handles all variations instantly.
How much should I tip?
In the US, standard restaurant tips are 15-20% of the pre-tax bill. For exceptional service, 25%+ is appreciated. Use our tip calculator to split the bill among any number of people.
What is a good BMI?
A BMI between 18.5 and 24.9 is considered healthy for most adults. BMI is a screening tool, not a diagnosis — always consult a healthcare provider. Try our BMI calculator to check yours.
How do I calculate loan payments?
Monthly loan payments depend on the principal amount, interest rate, and loan term. Our loan calculator uses the standard amortization formula to give you exact monthly payments and total interest.
📖 From Our Blog
How to Calculate Tips, Discounts, and Percentages
Quick mental math tricks and our free calculators make everyday percentage problems effortless. Covers tipping, sale prices, percentage increases, and more.
Read Article →How to Calculate the Right Tip Every Time
Master tipping etiquette with standard percentages, quick mental math shortcuts, and guidance for restaurants, delivery, salons, and more.
Read Article →Understanding Loan Interest: How to Calculate What You'll Really Pay
Learn how loan interest works, the difference between simple and compound interest, and how to calculate total loan costs before borrowing.
Read Article →BMI Explained: What the Numbers Mean and How to Use Them
Understand BMI categories, how to calculate your body mass index, and why it's just one piece of the health puzzle.
Read Article →5 Everyday Math Mistakes That Cost You Money
From over-tipping to underestimating loan interest, learn the most common calculation errors that drain your wallet — and how to fix them.
Read Article →