Calculators
Math, money, home and building calculators with formulas and worked examples, so you see how the answer was reached.
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- Auto loan calculatorPopularWork out your monthly car payment from the vehicle price, down payment, APR and loan term, and…
- Compound interest calculatorPopularSee how an initial deposit and monthly contributions grow with compound interest, compare…
- GPA calculatorPopularEnter your courses, credit hours and letter grades to get your semester GPA on the 4.0 scale.
- Grade calculatorWork out your current grade in a class from each category's score and weight: homework…
- Loan calculatorFind the monthly payment for a personal loan or any fixed-rate installment loan, see how much…
- Mortgage calculatorEstimate your full monthly mortgage payment, principal, interest, property tax, homeowners…
All other tools
95 more tools, A to Z.
- AC BTU calculatorEstimate a room's cooling load in BTU per hour from its size, insulation, sun exposure…
- Amortization calculatorEnter a loan amount, interest rate and term to get the complete amortization schedule: how much…
- APR calculatorThe interest rate isn't the whole cost of a loan.
- Arc length calculatorEnter a radius and a central angle to get the arc length, the area of the sector, the chord…
- Area calculatorFind the area and perimeter of common shapes, including rectangles, triangles, trapezoids…
- Average calculatorPaste a list of numbers to get the mean, median, mode, count and sum, or switch to weighted…
- Brick and block calculatorEnter your wall size, pick a brick or concrete block, subtract doors and windows, and get the…
- Cat age calculatorEnter your cat's age to see the equivalent in human years and which life stage it's in, from…
- CD calculatorFind out how much interest a certificate of deposit will earn, what you will have at maturity…
- Circle calculatorEnter any one measurement of a circle (radius, diameter, circumference or area) to get all the…
- Combination generatorEnter a set of items, choose how many to pick, and get the exact number of combinations (nCr)…
- Concrete calculatorWork out cubic yards for a slab, footing, pier, column, round form tube or concrete steps, then…
- Cost of smoking calculatorSee what cigarettes really cost you per day, month, year and decade, and how much the same…
- Credit card payoff calculatorFind out how many months it will take to pay off your card and how much interest you'll pay, or…
- Density calculatorCalculate density from mass and volume, or find the mass or volume when you know the density.
- Depreciation calculatorCreate a year-by-year depreciation schedule for an asset using the straight-line, declining…
- Derivative calculatorType a function of x to get its first, second or third derivative, with the differentiation…
- Discount calculatorWhat does 20% off come to, and how much do you save?
- Distance formula calculatorEnter two points on a coordinate plane to get the distance between them, the midpoint, the…
- Dog age calculatorFind out how old your dog is in human years.
- Download time calculatorFind out how long a file will take to download or upload at your connection speed, or work…
- Drywall calculatorFind out how many sheets of drywall you need for a wall or ceiling, plus studs, track, screws…
- Electricity cost calculatorFind out how much electricity an appliance uses and what it costs to run per day, month and…
- Factorial calculatorCalculate the exact factorial of any whole number from 0 to 5000, see how many digits it has…
- Final grade calculatorWhat do you need on the final to keep your A, get a B, or pass the class?
- Fraction calculatorAdd, subtract, multiply and divide fractions with step-by-step work, simplify any fraction to…
- Gas mileage calculatorWork out your real gas mileage from fill-ups, estimate the fuel cost of a road trip and split…
- GCF calculatorFind the greatest common factor of two or more whole numbers, with the prime factorization of…
- Graphing calculatorPlot several functions at once, turn any letter into a slider, zoom and drag the graph, and let…
- Gravel calculatorWork out how much gravel, crushed stone, road base, sand or topsoil to order, in cubic yards…
- Inflation calculatorFind out what a dollar amount from one year is worth in another year using official U.S.
- Infrared heater calculatorFind the infrared panel wattage for a room from its size and insulation, get a suggested panel…
- Insulation R-value calculatorAdd insulation to an attic, wall or floor and see the new R-value and U-factor, how many inches…
- Integral calculatorFind the antiderivative of a function, or the definite integral between two limits, with an…
- Interactive periodic tableClick any of the 118 elements to see its atomic number, atomic mass, group, period and state…
- Interest calculatorCalculate simple interest on a principal for a number of days, and convert between a nominal…
- Investment calculatorProject the future value of your savings with regular monthly contributions, adjust for…
- Laminate flooring calculatorAdd your rooms, pick the layout pattern, and get the number of boxes of laminate or vinyl plank…
- LCM calculatorFind the least common multiple of two or more whole numbers, with each number's prime…
- Limit calculatorFind the limit of a function as x approaches a number or infinity, from both sides or one side…
- Loan payoff calculatorEnter what you still owe, your interest rate and your monthly payment to see when the loan will…
- Log calculatorCalculate the logarithm of a positive number in any base, with one-tap buttons for base 10…
- Margin calculatorWork out gross margin and markup from cost and selling price, find the price you need for a…
- Math worksheet generatorCreate printable addition, subtraction, multiplication and division worksheets for any number…
- Matrix calculatorCalculate the determinant, inverse, product, sum, transpose, rank or row echelon form of…
- Molar mass calculatorType a chemical formula to get its molar mass in g/mol, a table with each element's count…
- Mulch calculatorFind out how many bags or cubic yards of mulch your beds need.
- Multiplication table practicePractice the times tables from 1 to 10 with instant feedback, explore an interactive…
- Number sequence generatorCreate a sequence of numbers such as 1 to 100, 0 to 1 in steps of 0.05, or IMG-001 to IMG-250…
- Odds converterConvert between American (+150 / −200), decimal and fractional odds, see the implied…
- Online calculatorA simple, fast calculator that works with your mouse, touchscreen or keyboard.
- Paint calculatorWork out how much paint a room needs: walls minus doors and windows, plus the ceiling if you…
- Percent change calculatorWork out how much a price, salary, score or any other number went up or down in percent, with…
- Percent error calculatorHow accurate was your measurement?
- Percentage calculatorThree percentage questions in one place: what is X% of Y, X is what percent of Y, and the…
- Percentage difference calculatorHow far apart are two numbers when neither one is the starting point?
- Permutation generatorGet every possible ordering of a set of items, with the exact count: all n!
- Present value calculatorCalculate what a future amount is worth today, what money today grows into, the present value…
- Prime factorization calculatorBreak any whole number up to 10¹⁵ into its prime factors, see the step-by-step division ladder…
- Probability calculatorCount combinations and permutations with or without repetition, arrangements of repeated items…
- Quadratic formula calculatorEnter a, b and c to solve any quadratic equation.
- Radiant floor heating calculatorEstimate the heat output of a hydronic radiant floor from the floor covering, pipe spacing and…
- Radiator size calculatorEstimate how much heat a room needs and which catalog output a panel radiator must have to…
- Ratio calculatorSolve proportions, scale recipes and prices with direct proportion, handle inverse proportion…
- Retirement calculatorSee what your savings could grow to by the time you retire, how much you would need to fund the…
- ROI calculatorCalculate the return on investment for a stock, property, project or marketing campaign…
- Roofing calculatorTurn your house footprint and roof pitch into roof square footage, squares and bundles of…
- Rounding calculatorRound any number to a decimal place, a place value such as tens or thousands, or a number of…
- Salary calculatorTurn an hourly wage into an annual salary, a yearly salary into a monthly or biweekly paycheck…
- Sales tax calculatorAdd sales tax to a price to see what you'll pay at the register, or take a receipt total and…
- Savings goal calculatorSaving for a down payment, a car, a wedding or an emergency fund?
- Scientific calculatorA full scientific calculator in your browser: trigonometry in degrees or radians, logarithms…
- Scientific notation calculatorConvert any number to scientific notation, engineering notation and calculator E notation, or…
- Screed and self-leveler calculatorWork out how many bags of screed or floor leveler you need, or how many cubic yards to order…
- Solar panel payback calculatorFind out what size solar system covers your usage, how many panels that is, how roof direction…
- Speed calculatorEnter any two of speed, distance and time to find the third.
- Square footage calculatorFind the square footage of any room, even L-shaped or with angled walls: walk the walls or…
- Square root calculatorFind the square root, cube root or any nth root of a number, see square roots simplified into…
- Stair calculatorEnter the total rise and get several step-count options, each with riser height, tread depth…
- Standard deviation calculatorPaste a list of numbers to get the sample and population standard deviation and variance, plus…
- Stucco and plaster calculatorEnter the wall area and your coats, and see how many pounds and bags of stucco or plaster each…
- Surface area calculatorFind the total surface area of common 3D shapes, including cubes, boxes, cylinders, spheres…
- System of equations solverSolve 2 to 6 linear equations in as many unknowns, with exact fractions and every Gauss–Jordan…
- Test grade calculatorGrade a test or quiz in seconds: enter the total number of questions or points and how many…
- Tile calculatorFind out how many tiles and boxes to buy for a floor or wall, with a waste allowance, plus how…
- Tip calculatorWork out the tip and the total in seconds, split the bill evenly between any number of people…
- Tire age (DOT code)Enter the DOT code from your tire's sidewall, or just its last four digits, to see the week and…
- Triangle calculatorSolve any triangle: find missing sides with the Pythagorean theorem, or get every side, angle…
- Trig calculatorEnter an angle in degrees, radians, gradians or turns to convert it to every other unit and to…
- VAT calculatorAdd VAT to a net amount, or take a VAT-inclusive price and split it into the net amount and the…
- Voltage drop calculatorEstimate the voltage drop on a copper or aluminum wire run from its length, current, AWG size…
- Volume calculatorCalculate the volume of boxes, cylinders, spheres, cones, pyramids, prisms and buckets in any…
- Wallpaper calculatorFind out how many rolls of wallpaper you really need.
- Weight on other planetsEnter your weight to see what a bathroom scale would show on the Moon, Mars, Jupiter, every…
- Wire size calculatorEnter the load, voltage and one-way distance to find the smallest copper or aluminum AWG that…
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- CM to inchesType a length in centimeters to get inches as a decimal, as a fraction you can find on a tape…
- KG to lbsConvert kilograms to pounds for body weight, luggage, gym plates or shipping.
- MM to inchesConvert millimeters to inches as a decimal and as the nearest fraction, handy for drill bits…
- Merge PDFCombine several PDFs and images into a single PDF.
- JPG to PDFPut one or many images into a single PDF.
- PDF to JPGSave each PDF page as a JPG image.
- Reverse image searchFind where an image comes from, spot fake profiles and locate higher-resolution copies.
- Meme generatorMake a meme from any picture: add bold top and bottom text with the classic outline, adjust the…