Calculators

Calculators for money, dates, school, fitness and everyday sums.

• Age & Date CalculatorDatesWork out an age, the days between two dates, a date plus or minus some days, or the weekday of any date.
• Percentage CalculatorNumbersPercent of a number, percent change, increase and decrease, and discounts, with the working shown.
• GPA & Grade CalculatorSchoolWork out your GPA from grades and credits, and see what you need on the final to reach a target grade.
• Fuel & Trip Cost CalculatorTravelWork out the fuel and cost of a trip from distance, fuel economy and price, and split it between passengers.
• Time Duration & Timesheet CalculatorTimeAdd and subtract hours and minutes, find the time between two clocks, and total a week of work hours with breaks.
• Statistics CalculatorNumbersPaste a list of numbers and get the mean, median, mode, range, standard deviation and more, with the working.
• Fraction CalculatorNumbersAdd, subtract, multiply and divide fractions and mixed numbers, simplified, with the decimal and the steps.
• Aspect Ratio CalculatorNumbersFind the ratio of a width and height, or resize while keeping the ratio. Common ratios included.
• Pace & Race Time CalculatorFitnessWork out pace, distance or finish time for a run or ride, with split times and common race distances.
• Prime, Factors & GCD CalculatorNumbersCheck if a number is prime, find its prime factors and all divisors, and the GCD and LCM of numbers.
• Data Transfer Time CalculatorComputersFind out how long a download or upload takes from the file size and your connection speed.
• Business Days CalculatorDatesAdd or subtract working days, or count them between two dates, skipping weekends and holidays you list.
• Subnet CalculatorDeveloperFind the network, broadcast address, mask and host range for an IPv4 address and prefix.
• Permutations and Combinations CalculatorNumbersCount the ways to choose or arrange things, with nCr, nPr and factorials as exact big numbers.
• Geometry CalculatorNumbersFind the area, perimeter or volume of common shapes, including a triangle solver.
• Chmod Permissions CalculatorDeveloperTick read, write and execute boxes to get the chmod number and the rwx string, or the other way round.
• Discount and Sale Price CalculatorMoneyFind a sale price after one or several discounts and tax, or work back to the original price.
• Screen Size and PPI CalculatorComputersWork out how sharp a screen is from its resolution and diagonal size.
• Ohm's Law CalculatorElectronicsEnter any two of voltage, current, resistance and power to get the other two.
• Resistor Color Code CalculatorElectronicsRead a resistor's color bands, or find the bands for a value, for 4-band and 5-band resistors.
• Quadratic Equation SolverNumbersSolve ax² + bx + c = 0 with the discriminant, roots, vertex and the working shown.
• Matrix CalculatorNumbersAdd, multiply, invert and transpose matrices up to 5 by 5, and find determinants.
• Sales Tax and VAT CalculatorMoneyAdd sales tax or VAT to a price, take it out of a price, or find the tax rate.

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