Calculators for money, business and everyday life
Get the answer instantly, understand what it means, compare scenarios and share the result with a link. And for school: worksheets with answer keys and a formula collection to print.
For teachers and students
- Create worksheets with answer keyNew questions every time, the key on a page of its own.
- Create your own formula sheetOnly the formulas you need, on one sheet for the test.
- Free printable formula sheet (PDF)Every formula in one file to print.
- Interactive formula collectionAn explanation, examples and a figure for every formula.
Often searched
Saving & investing
- Compound interest calculatorSee how a starting amount and monthly deposits grow when your returns earn returns of their own. Compare two plans side by side.
- CAGR calculatorTurn a starting value, an ending value and a number of years into one smooth annual growth rate. Compare two investments side by side.
- Savings goal calculatorFind out how much to save each month to reach your target, the return you need on what you already save, or how long it will take. See how much comes from growth rather than your own deposits, and compare two plans side by side.
- Simple interest calculatorWork out interest that accrues only on the original amount, and see how it compares with compound interest. Put two rates side by side and see the difference.
- Doubling time calculatorSee how long your money takes to double at a given rate — the quick Rule of 72 estimate and the exact figure — or how many years an amount needs to reach a target when it doubles every T years.
- FIRE calculatorEnter your spending, a withdrawal rate and what you save — get the capital you need and how long it takes to reach it.
- Rental yield calculatorEnter the price, the rent, the costs and the loan — get the gross and net yield, the cash flow and the return on the cash you put in.
Loans
- Loan calculatorFind your monthly payment, what the loan costs in interest and how equal payments compare with equal principal. Put two rates or terms side by side and see the difference.
- What will this loan cost you?Interest is rarely the whole price. Add the arrangement fee and the monthly fee to see what the loan costs altogether — and what share of the amount you borrow goes on borrowing it.
- APR calculatorThe effective interest rate on a consumer loan, once the fees are folded into the nominal rate.
- Interest calculatorFind out how much interest a loan costs per month and per year, and what it adds up to over the whole term.
- Debt payoff calculatorSee how long it takes to clear a balance at a fixed monthly payment, and the total interest cost. Compare two payoff plans side by side.
- Rent or buy calculatorEnter the price, the loan, the rent and what you think prices and returns will do — see who is better off after N years, and from which year buying pulls ahead.
- Car lease calculatorEnter the price, the residual value, the term and the rate — get the monthly payment, the total cost and how it compares with buying on a loan.
Business
- Margin calculatorWork out your margin and markup from cost and price — or the price you need to charge for a target margin. Compare two pricings side by side.
- ROI calculatorWork out your return on investment in total and per year, so you can compare it with other options. Put two investments side by side and see the difference.
- Break-even calculatorFind out how many units you need to sell — and how much revenue that is — before you start making a profit. Compare two price points side by side.
- Investment appraisal calculatorIs the investment worth it? Work out the net present value, payback period, annuity and internal rate of return from the initial outlay, yearly cash flows, residual value and discount rate.
- Discount calculatorEnter a price and a discount percentage to see the amount saved and the final price.
- Commission calculatorCommission from a sale and a rate — or the rate, or the sale you need.
Math
- Percentage calculatorThree everyday percentage questions in one place — pick the one you need.
- Proportion calculatorSolve a is to b as c is to x. Enter any three numbers to find the fourth.
- Scientific calculatorType or tap an expression — the result updates as you type, and your calculations stay in the link.
- Molar mass calculatorType a chemical formula and see its molar mass, with each element's share of it, and turn grams into moles.
- Derivative calculatorType a function and see its derivative written the way you would write it by hand — and what it comes to at a point.
- Integral calculatorType a function to see its antiderivative — and, with bounds, the definite integral's value.
- Equation solverType an equation or an inequality and see how it is solved, line by line, with the reason for every step.
- Graphing calculatorType a function and see its graph, with the zeros, turning points and intersections listed beside it.
- System of equations calculatorType two equations in two unknowns, or three in three, and see the system solved step by step by the method you choose.
- Triangle solverEnter three of a triangle's sides and angles, at least one side, and see the rest worked out step by step.
- Matrix calculatorType a matrix and choose what to find. The working is shown one row operation at a time, in exact fractions.
- Linear programming calculatorType the inequalities and the objective function, choose largest or smallest, and see the region drawn and the corner method worked through line by line.
- Polynomial division calculatorType two polynomials and see the quotient, the remainder and the long division worked out one step at a time.
- Prime factorization calculatorType a whole number and see it broken into prime factors, with every division written out.
- GCD calculatorType two or more whole numbers and see their greatest common divisor, with the prime factors and Euclid's algorithm both written out.
- LCM calculatorType two or more whole numbers and see their least common multiple — the common denominator — with the prime factors written out.
- Fraction calculatorEnter two fractions or mixed numbers, choose an operation, and see the answer as a simplified fraction, a mixed number and a decimal, with every step written out.
- Addition worksheetsChoose the numbers and whether to carry, then print the sheet and its answer key — or answer the same questions on screen.
- Subtraction worksheetsChoose the numbers and whether to borrow, then print the sheet and its answer key — or answer the same questions on screen.
- Times tables worksheetsPick one table or several, then print the sheet and its answer key — or answer the same questions on screen.
- Division worksheetsPick the tables and whether there are remainders, then print the sheet and its answer key — or answer the same questions on screen.
- Place value worksheetsChoose two-, three- or four-digit numbers and what to ask, then print the sheet and its answer key — or answer on screen.
- Column method worksheetsChoose addition, subtraction or multiplication and how long the numbers are. The sheet prints the frame; the answer key fills it in.
- Number bonds worksheetsTwo numbers that make ten. Print a sheet with its answer key, or answer the same questions on screen.
- Unit conversion worksheetsChoose length, mass, volume or time, and whole numbers or decimals. Print the sheet with its answer key, or answer on screen.
- Telling time worksheetsChoose what to ask and how fine the times are. Print the sheet with its answer key, or answer on screen.
- Money worksheetsChoose adding or change, and whole amounts or amounts with cents. Print the sheet with its answer key, or answer on screen.
- Simple equations worksheetsChoose one-step or two-step equations and how large x can be. Print the sheet with its answer key, or answer on screen.
- Tables and bar chart worksheetsChoose years 1–3 or 4–6 and the kind of question. Print the sheet with its answer key, or answer on screen.
- Statistics calculatorPaste a list of numbers and see the mean, median, spread, quartiles and outliers, with a box plot.
- P-value calculatorChoose a test, fill in your numbers and see the statistic, the degrees of freedom, the p-value and whether to reject the null hypothesis.
- Cubic equation solverType the four coefficients and get all three roots — real and complex — with the working.
- Long division calculatorType two numbers and see the division laid out the way it is written on paper, one digit at a time.
- Prime factorisation worksheetsChoose prime factorisation, which numbers are prime, or the divisibility rules, and how large the numbers are. Print the sheet with its answer key, or answer on screen.
- Binary to decimal converterType a number, say which base it is written in, and see it in binary, octal, decimal and hexadecimal at once, with the working.
- Number to words converterType a number and read it out in words, in English or Swedish, as a number, an ordinal or an amount of money.
- Polar to cartesian calculatorConvert between x and y and distance and angle, and between decimal degrees and degrees, minutes and seconds.
- Sensitivity and specificity calculatorA test's four counts in, every rate it can be judged by out — with a 95% interval around each proportion.
- Regression calculatorType two lists of numbers and see the best-fitting line or curve, its equation and how well it fits.
- Fractions worksheetsChoose the kind of question and how many parts the figures have. Print the sheet with its answer key, or answer on screen.
- Symmetry worksheetsChoose what to ask and how the mirror line may run. Print the sheet with its answer key, or answer on screen.
- Estimation worksheetsChoose which value is reasonable, or which of two things is more. Print the sheet with its answer key, or answer on screen.
- Chemical equation balancerType a reaction and see it balanced, with the atoms of every element counted on both sides.
Everyday
- Electricity cost calculatorEnter the power in watts, how long it runs and your price per kWh — get kilowatt-hours and money.
- Unit price calculatorPrice divided by amount, with the unit converted for you. Add a second scenario to see which pack is actually cheaper.
- What is your hourly rate a month?Your hourly rate times your hours, turned into a month and a year. Gross amounts, before tax and without holiday pay — and the page says what it leaves out.
- Fuel cost calculatorEnter the distance, what your car uses and the price at the pump — get the litres, what the trip costs and what 10 km costs in your car.
- Paint calculatorThe wall area worked out from the measurements you have, and the litres from the coverage printed on your tin.
- Days between two datesPick two dates and get the number of days – counted as the days between them or with both dates included. You also see how many are weekdays and how long the span is in years, months and days.
- Week number calculatorPick a date and see its week number, or enter a week number and a year and get the dates of that week. The page starts on today.
- Age calculatorEnter a date of birth and see the age in years, months and days, how many days have been lived and how long it is until the next birthday.
- Time calculatorAdd and subtract durations in hours and minutes, or convert between hours and minutes and decimal hours.
- Price per square metre calculatorA price divided by an area, and the same sum backwards. Add a second scenario to see which of two properties is really the dearer one per square metre.
- BMI calculatorWeight and height in, BMI, WHO category and the weight range WHO calls normal for your height out.
- Calorie calculatorYour body measurements and activity level in, the calories you burn a day, and the intake for your goal, out.
- Unit converterPick a quantity, type a value and choose the units. Every factor is exact and comes with its source.
- Cooking converterConvert recipe measures: cups, tablespoons, teaspoons, deciliters and milliliters, and grams for a few ingredients.
- kg to lbs converterType a weight in kilograms and read it in pounds, or swap the units and go the other way.
- cm to inches converterType a length in centimeters and read it in inches, or swap and go from inches to centimeters.
- Feet to meters converterType a length in feet and read it in meters, or swap and convert meters to feet.
- Fahrenheit to Celsius converterType a temperature in °F and read it in °C, or swap and go from Celsius to Fahrenheit.
- Miles to km converterType a distance in miles and read it in kilometers, or swap and convert kilometers to miles.
- Swedish mile (mil) to kmIn Sweden and Norway a mil is 10 kilometers. Type a distance in mil and read it in km, or swap.
- Due date calculatorThe first day of your last period or the conception date in; the estimated due date, the week today and the trimester dates out.
- Heart rate zone calculatorYour resting heart rate and age (or measured maximum) in; five training zones in beats per minute out.
- Steps to km calculatorSteps, height and walking speed in; distance, time and energy out.
- Aspect ratio calculatorEnter a width and a height — get the ratio, and the new height or width that keeps the shape.
- Download time calculatorEnter the file size, your line speed in Mbit/s and the overhead — get the time, or turn it round and get the speed you need.
- Watts to amps calculatorEnter the power, the voltage and the power factor — get the current in amps for single phase or three phase, or turn it round.
- Stopping distance calculatorEnter the speed, the reaction time and the friction of the road — get the distance covered while reacting, while braking and in total.
- Resistor colour code calculatorPick the colours of the bands to read the resistance, tolerance and temperature coefficient, or type a value and see which bands to look for.
- One-rep max calculatorThe weight you lifted and how many times in, an estimated one-rep max by two formulas and a table from 50 to 95 percent out.
- Body measurements calculatorHeight, weight, waist and hip in, five body ratios and estimates out.
- Roof pitch calculatorType the pitch the way you have it, and read it in the other ways, along with the rafter length for your building.
- Tile calculatorThe number of tiles from the area, the tile size, the joint and the waste you choose, and the grout the joints take.
- Tire size calculatorTwo sizes side by side, with the difference in diameter and what the speedometer shows against the true speed.
- Decking calculatorBoards, joists or posts, and screws counted from the size, the board width, the gap and the spacing you choose.
- EV charging cost calculatorEnter the battery, the consumption and your price per kWh — get the cost of a full charge, of 100 km and of a month, set against a petrol car.