Calculators & Converters
Free calculators for loans, mortgages, salary, BMI, and interest, plus unit and currency converters. Get accurate results from 45 online tools.
45 free tools in Calculators & Converters
Percentage Calculator
Work out percentages and see the formula behind each answer.
Open toolScientific Calculator
Use trigonometry, logarithms and memory functions in a full scientific calculator.
Open toolGPA Calculator
Calculate your GPA or CGPA with weighted credits and your own grading scale.
Open toolEMI Calculator
Calculate loan EMIs and see the amortization schedule, including prepayments.
Open toolAge Calculator
Find your exact age in years, months and days from a date of birth.
Open toolBMI Calculator
Calculate your BMI and see which healthy weight range you fall in.
Open toolDiscount Calculator
Work out sale prices, tax and BOGO deals in one step.
Open toolUnit Converter
Convert length, weight, temperature and more with high precision.
Open toolLove Calculator
Try a fun love compatibility calculator with a simple breakdown chart.
Open toolLoan Calculator
Find your monthly payment and the total interest on any loan.
Open toolMortgage Calculator
Estimate monthly mortgage payments, including taxes and insurance.
Open toolSalary / Take-Home Pay Calculator
Estimate your take home pay after common deductions.
Open toolTip Calculator
Calculate the tip and split the bill between friends in seconds.
Open toolCurrency Converter
Convert between world currencies using live exchange rates.
Open toolCalorie Calculator (TDEE)
Estimate your daily calorie needs from your activity level and goal.
Open toolMacro Calculator
Turn your calorie goal into daily protein, carb and fat targets.
Open toolRetirement Savings Calculator
Project how your retirement savings grow with your contributions and returns.
Open toolCar Loan Calculator
Calculate monthly car loan payments with a trade-in and down payment.
Open toolInvestment Return Calculator
See how an investment grows over time with regular contributions.
Open toolWater Intake Calculator
Estimate how much water to drink each day from your weight and activity.
Open toolHeart Rate Zone Calculator
Calculate your training heart rate zones from your age and resting heart rate.
Open toolBreak-Even Calculator
Find the sales volume where your business starts to make a profit.
Open toolCompound Interest Calculator
See how savings or investments grow with compound interest over time.
Open toolRoman Numeral Converter
Convert numbers to Roman numerals and back.
Open toolInvoice Generator
Create a professional PDF invoice with your logo, line items and totals.
Open toolProfit Margin Calculator
Calculate gross profit margin and markup from cost and sale price.
Open toolDate Difference Calculator
Calculate the exact days, months or years between two dates.
Open toolWork Days Calculator
Count business days between two dates, with weekends left out.
Open toolTime Duration Calculator
Add or subtract hours, minutes and seconds between two times.
Open toolHourly to Salary Converter
Convert an hourly wage into daily, weekly, monthly and yearly pay.
Open toolBill Splitter Calculator
Split a shared bill evenly or by custom shares.
Open toolSimple Interest Calculator
Calculate simple interest on a loan or deposit over time.
Open toolDebt Payoff Calculator
Compare the snowball and avalanche methods to pay off debt faster.
Open toolFreelance Hourly Rate Calculator
Work out the hourly rate you need to charge to hit your income goal.
Open toolOvertime Pay Calculator
Calculate overtime pay at 1.5x or 2x your regular hourly rate.
Open tool401(k) Contribution Calculator
Estimate how your 401(k) contributions could grow by retirement.
Open toolCar Depreciation Calculator
Estimate how much a car's value drops over the years you own it.
Open toolLease vs Buy Car Calculator
Compare the total cost of leasing a car with buying one.
Open toolProperty Tax Estimator
Get a rough property tax estimate from your home's value and local rate.
Open tool529 College Savings Growth Calculator
Project how a 529 college savings plan grows with regular contributions.
Open toolSocial Security Full Retirement Age Calculator
Find your full retirement age and how it affects your benefit, based on birth year.
Open toolShoe Size Converter
Convert shoe sizes between US, UK, EU and CM.
Open toolClothing Size Converter
Convert clothing sizes between US, UK, EU and international charts.
Open toolRing Size Converter
Convert ring sizes between US, UK and EU systems.
Open toolOven Temperature Converter
Convert oven temperatures between Fahrenheit, Celsius and gas mark.
Open toolAbout
About Calculators & Converters
Money, health, and measurement questions come up all the time. How much is this loan going to cost, what is my take home pay, or how many cups are in a liter? These 45 free calculators and converters give you answers with clear inputs and no spreadsheet setup.
Money tools lead the list. Loan Calculator, Mortgage Calculator, EMI Calculator, and Car Loan Calculator show monthly payments and total interest. Compound Interest Calculator, Simple Interest Calculator, and Investment Return Calculator project growth, while Debt Payoff Calculator, Retirement Savings Calculator, and 401(k) Contribution Calculator help you plan ahead.
Work and business tools cover pay and profit. Salary / Take-Home Pay Calculator, Hourly to Salary Converter, Overtime Pay Calculator, and Freelance Hourly Rate Calculator turn rates into real income. Break-Even Calculator, Profit Margin Calculator, Discount Calculator, Invoice Generator, and Bill Splitter Calculator handle daily business math.
Health and daily life tools sit alongside them. BMI Calculator, Calorie Calculator (TDEE), Macro Calculator, Water Intake Calculator, and Heart Rate Zone Calculator support fitness goals. Age Calculator, Date Difference Calculator, Work Days Calculator, and Time Duration Calculator count time, and GPA Calculator and Percentage Calculator help students.
Converters finish the category. Unit Converter, Currency Converter, Roman Numeral Converter, Oven Temperature Converter, and the Shoe, Clothing, and Ring Size converters translate values between systems. Property Tax Estimator, Social Security Full Retirement Age Calculator, 529 College Savings Growth Calculator, and Car Depreciation Calculator cover bigger planning questions.
FAQ
Frequently asked questions
How do I calculate my monthly loan payment?
Enter the loan amount, interest rate, and term in Loan Calculator. It returns the monthly payment and the total interest you will pay over the loan. A longer term lowers the monthly payment but raises total interest, so compare a few terms.
What is the difference between simple and compound interest?
Simple interest pays only on the original amount, while compound interest also pays on earlier interest. Over long periods compounding grows money much faster. Compare both with Simple Interest Calculator and Compound Interest Calculator using the same figures.
How do I calculate take home pay after taxes?
Enter your gross salary and location details in Salary / Take-Home Pay Calculator. It estimates deductions and shows net pay per year, month, and paycheck. Results are estimates, because benefits, filing status, and local rules change the final amount.
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15 percent of 80 is 12. Percentage Calculator does this for you and also finds percentage change and what percent one number is of another.
What is a healthy BMI range?
A BMI between 18.5 and 24.9 falls in the normal weight range for most adults. BMI Calculator takes your height and weight and returns the number plus its category. BMI ignores muscle mass and body shape, so treat it as a screening tool.
How many calories do I need each day?
Your daily need depends on age, sex, height, weight, and activity. Calorie Calculator (TDEE) estimates total daily energy expenditure from those inputs. Eating below that number leads to weight loss over time, and eating above it leads to weight gain.
How do I calculate profit margin?
Subtract cost from revenue to get profit, divide profit by revenue, and multiply by 100. A product that sells for 50 and costs 30 has a 40 percent margin. Profit Margin Calculator also shows markup so you can compare both.
How do I convert between currencies?
Pick the two currencies in Currency Converter, enter the amount, and read the converted value. Exchange rates change throughout the day, so the figure suits planning and estimates. Banks and card providers add fees and use their own rates for real payments.