Toolslay

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.

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Scientific Calculator

Use trigonometry, logarithms and memory functions in a full scientific calculator.

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GPA Calculator

Calculate your GPA or CGPA with weighted credits and your own grading scale.

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EMI Calculator

Calculate loan EMIs and see the amortization schedule, including prepayments.

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Age Calculator

Find your exact age in years, months and days from a date of birth.

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BMI Calculator

Calculate your BMI and see which healthy weight range you fall in.

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Discount Calculator

Work out sale prices, tax and BOGO deals in one step.

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Unit Converter

Convert length, weight, temperature and more with high precision.

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Love Calculator

Try a fun love compatibility calculator with a simple breakdown chart.

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Loan Calculator

Find your monthly payment and the total interest on any loan.

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Mortgage Calculator

Estimate monthly mortgage payments, including taxes and insurance.

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Salary / Take-Home Pay Calculator

Estimate your take home pay after common deductions.

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Tip Calculator

Calculate the tip and split the bill between friends in seconds.

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Currency Converter

Convert between world currencies using live exchange rates.

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Calorie Calculator (TDEE)

Estimate your daily calorie needs from your activity level and goal.

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Macro Calculator

Turn your calorie goal into daily protein, carb and fat targets.

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Retirement Savings Calculator

Project how your retirement savings grow with your contributions and returns.

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Car Loan Calculator

Calculate monthly car loan payments with a trade-in and down payment.

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Investment Return Calculator

See how an investment grows over time with regular contributions.

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Water Intake Calculator

Estimate how much water to drink each day from your weight and activity.

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Heart Rate Zone Calculator

Calculate your training heart rate zones from your age and resting heart rate.

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Break-Even Calculator

Find the sales volume where your business starts to make a profit.

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Compound Interest Calculator

See how savings or investments grow with compound interest over time.

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Roman Numeral Converter

Convert numbers to Roman numerals and back.

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Invoice Generator

Create a professional PDF invoice with your logo, line items and totals.

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Profit Margin Calculator

Calculate gross profit margin and markup from cost and sale price.

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Date Difference Calculator

Calculate the exact days, months or years between two dates.

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Work Days Calculator

Count business days between two dates, with weekends left out.

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Time Duration Calculator

Add or subtract hours, minutes and seconds between two times.

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Hourly to Salary Converter

Convert an hourly wage into daily, weekly, monthly and yearly pay.

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Bill Splitter Calculator

Split a shared bill evenly or by custom shares.

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Simple Interest Calculator

Calculate simple interest on a loan or deposit over time.

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Debt Payoff Calculator

Compare the snowball and avalanche methods to pay off debt faster.

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Freelance Hourly Rate Calculator

Work out the hourly rate you need to charge to hit your income goal.

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Overtime Pay Calculator

Calculate overtime pay at 1.5x or 2x your regular hourly rate.

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401(k) Contribution Calculator

Estimate how your 401(k) contributions could grow by retirement.

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Car Depreciation Calculator

Estimate how much a car's value drops over the years you own it.

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Lease vs Buy Car Calculator

Compare the total cost of leasing a car with buying one.

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Property Tax Estimator

Get a rough property tax estimate from your home's value and local rate.

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529 College Savings Growth Calculator

Project how a 529 college savings plan grows with regular contributions.

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Social Security Full Retirement Age Calculator

Find your full retirement age and how it affects your benefit, based on birth year.

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Shoe Size Converter

Convert shoe sizes between US, UK, EU and CM.

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Clothing Size Converter

Convert clothing sizes between US, UK, EU and international charts.

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Ring Size Converter

Convert ring sizes between US, UK and EU systems.

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Oven Temperature Converter

Convert oven temperatures between Fahrenheit, Celsius and gas mark.

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About

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.

Most tools run in your browserFast, nothing to installFree, no sign-up

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.