245 free tools, none of them upload anything.

Percentage calculatorEnter two numbers and get every percentage answer at the same time. Age calculatorWork out an exact age, and how long until the next birthday. BMI calculatorWork out body mass index, with the healthy weight range for your height. Loan calculatorSee the monthly payment, the total repaid and how much of it is interest. Unit converterConvert one amount into every other unit at once. Discount calculatorSee what you actually pay and what you actually save. Tip calculatorWork out the tip, the total, and what each person owes. Days between two datesCount the days, weeks and working days between any two dates. Compound interest calculatorSee what regular saving grows into over time. VAT and sales tax calculatorAdd tax to a price, or work out the tax already inside one. Aspect ratio calculatorWork out the missing dimension so nothing gets stretched. Random number generatorGenerate numbers in any range, with or without repeats. Time zone converterSee one moment written out in every major zone at once. Calorie calculatorEstimate daily calorie needs from height, weight, age and activity. Salary calculatorConvert pay between hourly, daily, weekly, monthly and yearly. Fuel cost calculatorWork out what a journey costs in fuel, and what each passenger owes. CalculatorA calculator that shows the whole expression, not just the last number. Mortgage calculatorMonthly payment, total interest, and a year-by-year breakdown of where the money goes. Hours calculatorStart time, finish time, minus the break. Get the hours worked and what they are worth. Date calculatorAdd or take away days, weekdays, weeks, months or years, and see which day it lands on. GPA calculatorPaste your grades and credit hours. Get your weighted grade point average. Grade calculatorYour grade so far, what the final is worth, and the grade you want. It tells you the mark you need. Fraction calculatorTwo fractions and an operation. The answer comes back reduced, as a mixed number and as a decimal. Standard deviation calculatorPaste your numbers. Mean, median, mode, quartiles, variance and standard deviation, all at once. Square footage calculatorMeasure in whatever units you have. Get the area in all of them. Sleep calculatorTell it when you need to be up. It suggests bedtimes that avoid waking mid-cycle. Body fat calculatorEstimate body fat percentage from a tape measure, with an honest note on how accurate that is. Due date calculatorAn estimated due date from your last period, adjusted for your cycle length. Ovulation calculatorAn estimate of when you ovulate and the days around it, from your cycle length. Retirement calculatorWhat your pot could grow to, and what it would be worth in today's money. Margin calculatorCost and price in, margin and markup out — both, so the two are never confused. Break-even calculatorHow many you must sell before the fixed costs are paid off and profit starts. Electricity cost calculatorWatts, hours and your rate per kWh. See the cost per day, month and year. Paint calculatorWall area minus doors and windows, times the number of coats, divided by the coverage on the tin. Tile calculatorRoom size and tile size, plus an allowance for cuts and breakages. Concrete calculatorLength, width and thickness give the volume, the bags and the ready-mix order. Macro calculatorCalories from the Mifflin-St Jeor equation, split into protein, fat and carbohydrate. Ideal weight calculatorDevine, Robinson, Miller and Hamwi — and the healthy BMI range for your height. Water intake calculatorA rough daily target from your weight, exercise and climate. Pace calculatorA distance and a target time give your pace per kilometre and per mile, plus the splits. Quadratic equation solverEnter a, b and c. Get the roots — including complex ones — plus the discriminant and vertex. Prime factorization calculatorBreak a number into its prime factors, and find out whether it is prime. LCM and GCD calculatorEnter two or more numbers. Get the highest common factor and the lowest common multiple. Triangle calculatorGive three sides and get every angle, the area, the perimeter and the type. Combination calculatorHow many ways to choose or arrange r things from n, with and without repetition.