Toolstia / Calculators & converters
Calculators and converters
More than a hundred calculators and converters for money, health, dates, maths and everyday units. Each one shows the result as you type, explains how it is worked out, and runs in your browser with no signup.
Use the groups below to find the right one: finance and business, health and fitness, dates and time, maths and statistics, and unit converters.
103 tools
Finance and business (32)
- Calculators & convertersLoan & EMI calculatorCalculate the monthly payment, total interest and total cost of a fixed-rate loan, with a year-by-year breakdown.
- Calculators & convertersCompound interest calculatorSee how savings or investments grow with compound interest and monthly contributions, year by year.
- Calculators & convertersVAT & GST calculatorAdd VAT, GST or sales tax to a price, or take it out of a price that already includes it.
- Calculators & convertersSIP calculatorEstimate what a monthly SIP investment could grow to, with total invested and estimated gain.
- Calculators & convertersFD calculatorWork out the maturity value of a fixed deposit, with interest added monthly, quarterly, half-yearly or yearly.
- Calculators & convertersRD calculatorCalculate the maturity value of a recurring deposit with a fixed monthly amount and quarterly compounding.
- Calculators & convertersDiscount calculatorFind the sale price, the original price or the discount percentage, and see how much you save.
- Calculators & convertersTip calculatorWork out the tip and split the bill between friends, with optional rounding up.
- Calculators & convertersFuel cost calculatorWork out how much fuel and money a trip will cost from distance, fuel economy and fuel price.
- Calculators & convertersProfit margin calculatorCalculate profit margin and markup from cost and price, or find the selling price you need for a target margin or markup.
- Calculators & convertersUnit price calculatorCompare products of different sizes by the price per 100 g, per litre, per piece or per metre and see which is the best value.
- Calculators & convertersSales tax calculatorAdd sales tax to a price, or find how much tax is inside a price that already includes it.
- Calculators & convertersHourly to salary calculatorConvert hourly pay into daily, weekly, monthly and yearly pay, or turn a yearly salary into an hourly rate.
- Calculators & convertersSalary increase calculatorWork out your new salary after a percentage raise, or find the percentage raise from an old and new salary.
- Calculators & convertersSimple interest calculatorCalculate simple interest and the total amount from a principal, a yearly rate and a time in years or months.
- Calculators & convertersROI calculatorWork out return on investment from what you put in and what you got back, plus the yearly compounded return.
- Calculators & convertersRule of 72 calculatorEstimate how many years it takes money to double at a given yearly return, or what return you need to double in a set time.
- Calculators & convertersMortgage calculatorEstimate your monthly mortgage payment with down payment, interest, property tax, insurance and fees, and see what extra payments save.
- Calculators & convertersAuto loan calculatorWork out the monthly payment, total interest and total cost of a car loan after down payment, trade-in, tax and fees.
- Calculators & convertersCredit card payoff calculatorSee how long it takes to clear a credit card balance and how much interest you pay, or the payment needed to be debt-free by a date.
- Calculators & convertersAPR calculatorFind the true yearly cost of a loan, including upfront fees, from the amount, fees and monthly payment.
- Calculators & convertersbreak-even calculatorFind how many units you must sell, and how much revenue you need, to cover your costs, plus the units for a target profit.
- Calculators & convertersmarkup calculatorWork out selling price, profit, markup and margin from cost and markup, cost and price, or price and margin.
- Calculators & converterscommission calculatorCalculate sales commission at a flat rate or with tiers, or find the sales needed to earn a target commission.
- Calculators & converterssavings goal calculatorFind the monthly deposit you need to reach a savings goal, or how long it will take with a deposit you can afford.
- Calculators & convertersdepreciation calculatorCreate a depreciation schedule for an asset using straight-line, declining balance or sum-of-the-years digits.
- Calculators & convertersovertime pay calculatorCalculate weekly pay with overtime, using your hourly rate, hours worked, overtime threshold and multiplier.
- Calculators & convertersfreelance rate calculatorWork out the hourly and day rate a freelancer needs to charge to earn a target income after costs and tax.
- Calculators & convertersCAGR calculatorCalculate compound annual growth rate from a start and end value, or find the ending value or years needed.
- Calculators & convertersNPV and IRR calculatorCalculate net present value, internal rate of return and payback period for a series of cash flows.
- Calculators & converterssplit the bill calculatorSplit a restaurant bill between friends with tip and tax, and see exactly what each person pays.
- Calculators & convertersinflation calculatorSee what prices and savings will be worth after years of inflation at a rate you choose.
Health and fitness (11)
- Calculators & convertersBMI calculatorWork out your body mass index in kg/cm or lb/ft, see the WHO category and the healthy weight range for your height.
- Calculators & convertersCalorie and BMR calculatorEstimate your BMR and daily calorie needs for maintaining, losing or gaining weight slowly.
- Calculators & convertersIdeal body weight calculatorEstimate an ideal weight for your height with the Devine, Robinson, Miller and Hamwi formulas, in kg or pounds.
- Calculators & convertersBody fat percentage calculatorEstimate body fat percentage from tape measurements using the US Navy method, with a fitness category and fat and lean mass.
- Calculators & convertersWaist to hip ratio calculatorDivide waist by hip measurement to see your waist-to-hip ratio and how it compares with the WHO limits.
- Calculators & convertersWaist to height ratio calculatorCompare your waist with your height. A ratio under 0.5 is the usual target. See your band and the waist size that is half your height.
- Calculators & convertersHeart rate zone calculatorWork out your maximum heart rate and five training zones from your age. Add resting heart rate for the Karvonen method.
- Calculators & convertersLean body mass calculatorEstimate your lean body mass from weight and height with the Boer, James and Hume formulas, and see the average.
- Calculators & convertersBody adiposity index calculatorEstimate body fat percentage from hip circumference and height only, with no weight needed, and see an adult range.
- Calculators & convertersBody frame size calculatorFind out whether you have a small, medium or large frame from your height and wrist circumference.
- Calculators & convertersCalories burned by distance calculatorEstimate calories burned walking, running or cycling a given distance for your weight, in km or miles.
Dates and time (11)
- Calculators & convertersAge and date difference calculatorFind an exact age or the gap between two dates in years, months, days, weeks and total days.
- Calculators & convertersTime zone converterConvert a date and time between time zones, with daylight saving applied, for as many cities as you like.
- Calculators & convertersWorking days calculatorCount working days between two dates, skipping weekends and holidays, or add working days to a date.
- Calculators & convertersBangla date converterConvert English dates to Bangla calendar dates (Bangabda) and back, with the weekday and season.
- Calculators & convertersDays between dates calculatorFind the number of days, weeks, months and years between two dates, or add and subtract time from a date.
- Calculators & convertersHours calculatorWork out hours worked between a start and end time with a break, or add up a list of hours and minutes.
- Calculators & convertersDeadline calculatorFind the date that falls a number of working days, calendar days, weeks or months after a start date, or count the time left to a deadline.
- Calculators & convertersDay of the week calculatorFind what day of the week any date falls on, plus the day of the year, ISO week, quarter and leap year. Also finds dates like the fourth Thursday of November.
- Calculators & convertersWeek number calculatorFind the ISO week number of any date, or find the Monday and Sunday dates of a given week number.
- Calculators & convertersdate add and subtract calculatorAdd or subtract years, months, weeks and days from any date and see the new date and weekday.
- Calculators & convertersleap year checkerCheck whether any year is a leap year, see the reason, the nearby leap years and every leap year in a range.
Maths and statistics (32)
- Calculators & convertersPercentage calculatorWork out percent of a number, percent change, discounts and tax with five quick calculators.
- Calculators & convertersGPA and CGPA calculatorCalculate GPA from your courses or CGPA across semesters, with 4.00 and 5.00 grade scales.
- Calculators & convertersAverage calculatorFind the mean, median, mode, range, sum and standard deviation of a list of numbers.
- Calculators & convertersStandard deviation calculatorFind the sample and population standard deviation, variance, mean and standard error of a list of numbers, with the working shown.
- Calculators & convertersZ-score calculatorConvert a raw score to a z-score and get the percentile, the area under the normal curve and the p-value. Or turn a z-score back into a raw score.
- Calculators & convertersConfidence interval calculatorCalculate a confidence interval for a mean from the sample mean, standard deviation and sample size, using the t or z distribution.
- Calculators & convertersSample size calculatorWork out how many people you need to survey for a chosen confidence level and margin of error, with optional population correction.
- Calculators & convertersPermutation and combination calculatorCalculate nPr and nCr, with or without repeats, using exact whole numbers even when the answer has hundreds of digits.
- Calculators & convertersFactorial calculatorCalculate n! exactly for any whole number up to 5000, with the digit count, trailing zeros and scientific notation.
- Calculators & convertersGCD and LCM calculatorFind the greatest common divisor and least common multiple of two or more whole numbers, with Euclid's algorithm steps.
- Calculators & convertersPrime factorization calculatorBreak a whole number into its prime factors, see if it is prime and count its divisors.
- Calculators & convertersFactors calculatorList every factor of a number, its factor pairs, the number of factors, and whether it is prime, perfect, abundant or deficient.
- Calculators & convertersModulo calculatorCalculate a mod n and see how the result differs for negative numbers in maths, JavaScript and Python.
- Calculators & convertersFraction calculatorAdd, subtract, multiply and divide fractions, mixed numbers and decimals. Get the simplified answer, mixed number and decimal.
- Calculators & convertersDecimal to fraction calculatorTurn a decimal into a fraction, including repeating decimals, and find the closest simple fraction for a long decimal.
- Calculators & convertersRatio calculatorSimplify ratios, solve proportions like a : b = c : d, and split a total in a given ratio.
- Calculators & convertersPercent error calculatorCalculate percent error between a measured and an accepted value, plus the signed error, absolute error and percent difference.
- Calculators & convertersQuadratic equation solverSolve ax² + bx + c = 0 and see the roots, discriminant, vertex and whether the roots are real or complex.
- Calculators & convertersExponent and root calculatorRaise a number to any power, get exact big-integer results, and find square roots, cube roots and any nth root with simplified radicals.
- Calculators & convertersLogarithm calculatorCalculate common, natural and binary logarithms, or the logarithm of a number to any base you choose.
- Calculators & convertersScientific notation converterConvert any number to scientific, E and engineering notation with the significant figures you choose, or convert scientific notation back to a plain number.
- Calculators & convertersRounding calculatorRound a number to any number of decimal places, tens or hundreds with half up, banker’s, floor, ceiling or truncate, and compare all methods.
- Calculators & convertersSignificant figures calculatorCount the significant figures in a number and round a number to a chosen number of significant figures.
- Calculators & convertersArea calculatorFind the area and perimeter of a circle, rectangle, triangle, trapezoid, ellipse, regular polygon, sector, ring and more.
- Calculators & convertersVolume calculatorFind the volume and surface area of a cube, box, sphere, cylinder, cone, pyramid, ellipsoid, torus and capsule.
- Calculators & convertersCircle calculatorEnter the radius, diameter, circumference or area of a circle and get all the others.
- Calculators & convertersPythagorean theorem calculatorFind the missing side of a right triangle from the other two, with both acute angles, area and perimeter.
- Calculators & convertersTriangle calculatorSolve any triangle from three sides, two sides and the included angle, or two angles and a side, with angles, area, heights and circle radii.
- Calculators & convertersSlope calculatorFind the slope, line equation, distance, midpoint, angle and intercepts from two points.
- Calculators & convertersSequence calculatorFind the nth term and the sum of an arithmetic or geometric sequence, or any Fibonacci number with all its digits.
- Calculators & convertersprobability calculatorWork out binomial probabilities, the chance of at least one success, and the odds of two independent events.
- Calculators & convertersnumber sorterSort a list of numbers from smallest to largest or the reverse, remove duplicates and see count, sum, mean and median.
Unit converters and other tools (17)
- Calculators & convertersUnit converterConvert length, weight, volume, area, speed, temperature, time and digital storage.
- Calculators & convertersAspect ratio calculatorFind the aspect ratio of an image or screen and work out the new height or width when you resize.
- Calculators & convertersPixel to cm converterConvert pixels to centimetres, millimetres and inches at any DPI, or work out pixels needed for a print size. Includes paper sizes.
- Calculators & converterslength converterConvert between millimetres, centimetres, metres, kilometres, inches, feet, yards, miles, nautical miles, light-years and more.
- Calculators & convertersweight converterConvert kilograms, grams, pounds, ounces, stone, tonnes, carats and grains in one step.
- Calculators & converterstemperature converterConvert between Celsius, Fahrenheit, Kelvin and Rankine, with values below absolute zero rejected.
- Calculators & convertersarea converterConvert square metres, square feet, acres, hectares, square kilometres, square miles and more.
- Calculators & convertersvolume converterConvert litres, millilitres, US and UK gallons, quarts, pints, cups, fluid ounces, cubic metres and more.
- Calculators & convertersspeed converterConvert km/h, mph, metres per second, knots, feet per second, Mach and the speed of light.
- Calculators & convertersdata storage converterConvert bits, bytes, KB, MB, GB, TB, PB and the binary units KiB, MiB, GiB, TiB and PiB.
- Calculators & converterstime converterConvert seconds, minutes, hours, days, weeks, months, years, decades and centuries, down to nanoseconds.
- Calculators & converterspressure converterConvert pascals, kPa, bar, atmospheres, psi, mmHg, inHg and torr.
- Calculators & convertersenergy converterConvert joules, kilojoules, calories, kilocalories, watt-hours, kWh, BTU, therms, foot-pounds and electronvolts.
- Calculators & converterspower converterConvert watts, kilowatts, megawatts, horsepower, metric horsepower, BTU per hour and tons of refrigeration.
- Calculators & convertersangle converterConvert degrees, radians, gradians, arcminutes, arcseconds, turns and milliradians.
- Calculators & convertersfuel economy converterConvert miles per US gallon, miles per UK gallon, kilometres per litre and litres per 100 km.
- Calculators & converterscooking measurement converterConvert cups, spoons, millilitres, grams and ounces for common baking ingredients like flour, sugar and butter.