Frequently Asked Questions

BuildCalc is a free website with calculators and tools for construction, math, finance, health, cooking, pets and everyday life. You can use it in a browser, with no sign-up and no download.

Yes, all BuildCalc calculators and tools are free to use, with no sign-up and no download.

No, you do not need to sign up. Search for a calculator, enter your numbers, and get an instant result.

Results are estimates and general information only, based on the numbers you enter. See each calculator's own note for its limits.

Use the search on the home page, or open a category box, such as Finance, Construction or Math, and pick a calculator from that list.

Yes, every page is built to work on a phone browser, as well as on a computer.

No, there is no app to download. BuildCalc works in your browser.

Most calculators work in your browser only and do not send your numbers to a server. Live tools that use a free external service are named on their own page and in the privacy policy.

A calculator gives a number from a formula, such as a loan payment. A tool helps with a task, such as a checklist, a timer, or a tracker, also in your browser.

Yes, BuildCalc is made for users in the USA, UK, Pakistan, Canada, Australia and around the world, with English pages throughout.

Because a calculator uses the numbers you enter and a simple formula. Real costs, taxes and rates can differ, so always check with a professional for a final decision.

On calculator pages you can use the Share button, or copy the page link from your browser and send it to someone else.

Yes, use the Print result button on calculator pages, or your browser Print option.

Check that you entered numbers in the right units, for example kilograms or pounds, and that no box is empty or negative where it should not be.

No, BuildCalc gives estimates and general information only. It is not financial, legal or medical advice.

The mortgage payment calculator helps you work out a monthly principal and interest payment. Enter a home price, a down payment, an interest rate and a term in years, and it shows the result straight away.

The loan monthly payment calculator helps you work out a monthly loan payment. Enter a loan amount, an interest rate and a term, and it shows the result straight away.

The compound interest calculator helps you work out how much the amount grows with compound interest. Enter a starting amount, a rate and a number of years, and it shows the result straight away.

The simple interest calculator helps you work out simple interest on that principal. Enter a principal, a rate and a time period, and it shows the result straight away.

The savings goal calculator helps you work out a monthly deposit needed to reach the goal, or a note if growth alone reaches it. Enter a goal amount, current savings, a rate and a number of months, and it shows the result straight away.

The budget calculator helps you work out a budget split and a remaining amount. Enter your income and spending by category, and it shows the result straight away.

The credit card payoff calculator helps you work out about how many months payoff will take and about how much interest it will cost. Enter a card balance, a rate and a monthly payment, and it shows the result straight away.

The retirement calculator helps you work out an estimated retirement corpus, with an inflation-adjusted figure where shown. Enter a monthly saving, a return rate and a number of years, and it shows the result straight away.

The loan amortization schedule calculator helps you work out a month-by-month schedule of interest, principal and balance. Enter a loan amount, a rate and a term, and it shows the result straight away.

The loan prepayment calculator helps you work out how much interest an extra payment can save. Enter a loan amount, a rate, a term and an extra monthly payment, and it shows the result straight away.

The rent vs buy calculator helps you work out a comparison of rent with an estimated mortgage payment, before taxes, insurance and maintenance. Enter a monthly rent and a home price with a rate, and it shows the result straight away.

The refinance comparison calculator helps you work out a comparison of the old and new monthly payments, before refinance fees. Enter an old monthly payment and a new loan amount with a rate, and it shows the result straight away.

The net worth calculator helps you work out net worth, which is assets minus debts. Enter total assets and total debts, and it shows the result straight away.

The expense tracker calculator helps you work out a total monthly expense figure. Enter monthly expenses by category, and it shows the result straight away.

The debt snowball and avalanche calculator helps you work out which debt to pay first under snowball, which is smallest balance first, and avalanche, which is highest rate first. Enter two debts with balances and rates, and it shows the result straight away.

The zakat calculator helps you work out an estimated Zakat at 2.5 percent on net qualifying wealth, as a planning estimate only. Enter cash, savings, gold and silver value, and debts you owe, and it shows the result straight away.

The business cash flow calculator helps you work out monthly cash flow, which is income minus expenses. Enter monthly business income and expenses, and it shows the result straight away.

The tax estimator calculator helps you work out a flat-rate tax estimate and a net figure, not a tax filing calculation. Enter an income and a flat tax rate you choose, and it shows the result straight away.

The salary to hourly calculator helps you work out an hourly rate and a monthly figure. Enter an annual salary and hours per week, and it shows the result straight away.

The credit card interest calculator helps you work out monthly interest on that balance. Enter a card balance and a monthly rate, and it shows the result straight away.

The inflation adjusted value calculator helps you work out what that amount is worth after inflation. Enter an amount, a rate and a number of years, and it shows the result straight away.

The break even units calculator helps you work out how many units must be sold to break even. Enter fixed costs and margin per unit, and it shows the result straight away.

The debt payoff months calculator helps you work out about how many months payoff will take. Enter a debt balance, a rate and a monthly payment, and it shows the result straight away.

The down payment calculator helps you work out a down payment amount. Enter a home price and a down payment percent, and it shows the result straight away.

The effective annual rate calculator helps you work out an effective annual rate. Enter a nominal rate and compounding periods, and it shows the result straight away.

The return on investment calculator helps you work out a return on investment percent. Enter a profit and an investment amount, and it shows the result straight away.

The compound annual growth rate calculator helps you work out a compound annual growth rate. Enter a starting value, an ending value and a number of years, and it shows the result straight away.

The future value of monthly savings calculator helps you work out a future value of those savings. Enter a monthly saving, a return rate and a number of years, and it shows the result straight away.

The present value calculator helps you work out a present value of that future amount. Enter a future amount, a rate and a number of years, and it shows the result straight away.

The annuity payment calculator helps you work out an annuity payment. Enter a present value, a rate and a number of periods, and it shows the result straight away.

The bond yield estimate calculator helps you work out an estimated bond yield, based on the numbers you enter. Enter a bond price, a coupon and a term, and it shows the result straight away.

The car loan payment calculator helps you work out a monthly car loan payment. Enter a car price, a rate and a term in months, and it shows the result straight away.

The personal loan EMI calculator helps you work out a monthly EMI payment. Enter a loan amount, a rate and a term, and it shows the result straight away.

The business loan payment calculator helps you work out a monthly business loan payment. Enter a business loan amount, a rate and a term, and it shows the result straight away.

The education savings calculator helps you work out an estimated education fund. Enter a monthly saving, a rate and a number of years, and it shows the result straight away.

The concrete calculator takes length, width and depth and gives concrete volume. Always confirm quantities with your supplier before ordering.

No, allow extra for waste, cuts and breakage, and confirm with your supplier or a qualified professional.

The paint calculator takes wall area and coverage per can and gives paint cans needed, rounded up. Always confirm quantities with your supplier before ordering.

No, allow extra for waste, cuts and breakage, and confirm with your supplier or a qualified professional.

The tile calculator takes floor area and tile area and gives tiles needed, rounded up. Always confirm quantities with your supplier before ordering.

No, allow extra for waste, cuts and breakage, and confirm with your supplier or a qualified professional.

The brick calculator takes wall area and bricks per square foot and gives bricks needed, rounded up. Always confirm quantities with your supplier before ordering.

No, allow extra for waste, cuts and breakage, and confirm with your supplier or a qualified professional.

The floor area calculator takes length and width and gives floor area. Always confirm quantities with your supplier before ordering.

No, allow extra for waste, cuts and breakage, and confirm with your supplier or a qualified professional.

The roof area calculator takes length and width and gives roof area. Always confirm quantities with your supplier before ordering.

No, allow extra for waste, cuts and breakage, and confirm with your supplier or a qualified professional.

The fence posts calculator takes fence length and spacing and gives fence posts needed. Always confirm quantities with your supplier before ordering.

No, allow extra for waste, cuts and breakage, and confirm with your supplier or a qualified professional.

The deck boards calculator takes deck area and board area and gives deck boards needed, rounded up. Always confirm quantities with your supplier before ordering.

No, allow extra for waste, cuts and breakage, and confirm with your supplier or a qualified professional.

The concrete bags calculator takes volume and volume per bag and gives bags needed, rounded up. Always confirm quantities with your supplier before ordering.

No, allow extra for waste, cuts and breakage, and confirm with your supplier or a qualified professional.

The wall area calculator takes length and height and gives wall area. Always confirm quantities with your supplier before ordering.

No, allow extra for waste, cuts and breakage, and confirm with your supplier or a qualified professional.

The percentage tool takes a part and a whole and gives a percentage.

The average tool takes two numbers and gives their average.

The BMI tool takes weight in kilograms and height in metres and gives a body mass index value, which is a general guide only, not a diagnosis.

The calorie tool takes weight and activity inputs and gives an estimated daily calorie figure.

The age tool takes a date of birth or years and gives an age in days, months or years.

The date difference tool takes two dates and gives days between those dates.

The unit conversion tool takes a value and a unit and gives the same value in another unit, such as miles to kilometres.

The discount tool takes a price and a discount percent and gives a discount amount and a price after discount.

The tip tool takes a bill and a tip percent and gives a tip amount and a total bill.

The bill split tool takes a total bill and a number of people and gives how much each person pays.

The password generator tool takes a length you choose and gives a random password in your browser only, which is not saved.

The timer tool takes minutes you choose and gives a countdown timer that runs while the page is open.

The recipe scaler tool takes an original amount and a scale factor and gives a scaled recipe amount.

The grade tool takes marks obtained and marks possible and gives a percentage grade.

The GPA tool takes total grade points and total courses and gives an estimated GPA.

The fuel cost tool takes distance, fuel use and fuel price and gives fuel used and fuel cost for a trip.

The run pace tool takes distance and time and gives pace per kilometre.

The word counter tool takes text you type and gives a word and character count, in your browser only.

The color picker tool takes a color you pick and gives its hex code.

The QR code generator tool takes text or a link you enter and gives a QR code image from a free QR service.

The barcode generator tool takes text you enter and gives a barcode image from a free barcode service.

The currency converter tool takes an amount and two currencies and gives a converted amount from a free currency service, when that service is reachable.

The weather forecast tool takes a place you choose and gives a forecast from a free weather service, when that service is reachable.

The flight tracker tool takes a flight you enter and gives a manual flight note, not a live single-flight status, unless a live service is shown on that page.

The hotel comparison tool takes prices you enter and gives a comparison of the prices you entered, not live hotel prices.

The stock watchlist tool takes prices you enter and gives a watchlist of the prices you entered, labelled as manual, not live, unless a live service is shown.

The image compressor tool takes an image you choose and gives a smaller image made in your browser with canvas, without uploading it.

The PDF maker tool takes text you enter and gives a PDF made with your browser Print to PDF option.

The resume builder tool takes your details and gives a simple resume layout you can print.

The invoice maker tool takes items and prices and gives an invoice layout you can print as PDF.

The quiz maker tool takes questions you set and gives a simple quiz with a score.

The diet plan tool takes age, weight, height and activity inputs and gives an estimated diet plan, as a general guide only, not medical advice.

The image converter tool takes an image you choose and gives a converted image made in your browser with canvas.

Open the Finance category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Finance calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Construction category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Construction calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Math category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Math calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Health category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Health calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Cooking category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Cooking calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Business category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Business calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Education category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Education calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Technology category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Technology calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Sports category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Sports calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Travel category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Travel calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Pet category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Pet calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Automotive category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Automotive calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Career category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Career calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Shopping category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Shopping calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Games category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Games calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Music category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Music calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Weather category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Weather calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Science category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Science calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Food category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Food calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Baby and Family category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Baby and Family calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Energy category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Energy calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Time and Date category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Time and Date calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Conversion category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Conversion calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Real Estate category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Real Estate calculators on BuildCalc are free to use, with no sign-up and no download.

Open the Everyday Life category page from the home page, use the category search box on that page, and pick a calculator from the list, with the most used calculators first.

Yes, Everyday Life calculators on BuildCalc are free to use, with no sign-up and no download.