Calculators for everyday numbers: money, work hours, dates, grades, geometry and statistics. Every calculator shows a worked example, the formula it uses and its limits, and runs entirely in your browser.
Calculate X% of a number, what percent one value is of another, and the percentage change between an old and a new value.
Find the saving and final price from an original price and a percentage discount, including stacked offers applied one after another.
Calculate age in completed years on any date, with the total days lived and the days remaining until the next birthday.
Count the exact days between two dates, with the gap also shown in weeks and approximate months, including leap years and past dates.
Calculate the elapsed hours and minutes between two clock times, including overnight spans that finish after midnight.
Calculate adult body mass index from weight and height in metric or imperial units, with the matching adult reference category.
Calculate a tip from the bill and a percentage, then see the total and an even per-person share for any group size.
Estimate the fixed monthly payment, total repaid and total interest for a loan from the amount, annual interest rate and term.
Project the future value of savings with compound interest and regular contributions, separating the money you put in from the growth.
Estimate the fuel a trip needs and what it costs, from the distance, the efficiency in L/100 km, km/L or US MPG, and the price per liter.
Find the average, sum, count, minimum and maximum of a list of numbers pasted in any common layout.
Simplify a ratio to its smallest whole numbers, including ratios with decimals or a zero part, and check equivalent ratios.
Add, subtract, multiply or divide two fractions and see the result reduced to lowest terms with its decimal value.
Calculate sales tax and the final price from a pre-tax amount and any combined tax rate, in any currency.
Calculate profit, profit margin and markup from the cost and the selling price, including losses when the cost is higher.
Turn points earned and points possible into a percentage grade, with a letter grade on a simple 90/80/70/60 scale.
Calculate running pace per kilometer or mile and average speed from a distance and an elapsed time.
Calculate worked time between a clock-in and a clock-out after subtracting an unpaid break, in hours and minutes and in decimal hours.
Calculate the area of a rectangular space in square feet or square meters, with the result shown in both units.
Compare packages by calculating the price per item, per kilogram or per any unit you choose.
Find the median of a list of numbers, with the middle values used and the count, for data that contains outliers.
Find the most frequent value or values in a list of numbers, with the highest frequency and the count.
Calculate the population and sample standard deviation of a list of numbers, together with the mean and the count.
Convert a fraction into a decimal and a percentage by dividing the numerator by the denominator.
Convert a decimal into a simplified fraction, with a maximum denominator you choose for exact values or close approximations.
Find the greatest common divisor and the least common multiple of two or more whole numbers.
Check whether a whole number is prime, and see its smallest divisor when it is not.
Solve ax² + bx + c = 0 with the quadratic formula, including repeated roots and complex conjugate pairs.
Find a missing side of a right triangle with a² + b² = c², choosing whether to calculate the hypotenuse or a leg.
Calculate the diameter, circumference and area of a circle from its radius, with full precision for π.
Calculate the area of a triangle from a base and perpendicular height, or from three known sides with Heron’s formula.
Turn favorable and total outcomes into a probability, a percentage and the odds for the event.
Count how many ways r items can be chosen from n, as combinations when order does not matter and permutations when it does.
Calculate simple interest and the final amount from a principal, an annual rate and a time in years, with no compounding.
Estimate how many months of monthly saving and interest it takes to reach a savings target, and the balance when you get there.
Calculate the gain or loss on an investment and the return on investment as a percentage of what you put in.
Work out how many units you need to sell to cover fixed and variable costs, and the revenue that volume brings in.
Turn an hourly wage into weekly, monthly and annual gross pay, with paid weeks and part-time hours taken into account.
Calculate regular pay, overtime pay and total gross earnings from an hourly wage, split hours and an overtime multiplier.
Add up a weekly time card from daily clock-in, clock-out and break times, with weekly overtime and gross pay when you enter a wage.
Convert hours and minutes into decimal hours and total minutes for timesheets, payroll and invoicing.
Add VAT to a net price or remove it from a tax-inclusive price, using any percentage rate.
Calculate sales commission at a flat percentage rate and the total earnings once base pay is added.
Estimate the monthly principal-and-interest payment on a mortgage, plus the total repaid and the total interest.
Calculate a credit-weighted GPA on a 4.0 scale from letter grades, one course per line.
Add or subtract days, weeks, months or years from any calendar date and see the resulting weekday and date.
Count the weekdays between two dates, with the option to include or exclude the final day.
Find the day of the week for any calendar date, past or future, shown in your language.
Estimate how much electricity an appliance uses and what it costs, from its wattage, daily runtime and your price per kWh.
Estimate how much paint a room needs from its dimensions, the area of doors and windows, the coverage on the tin and the number of coats.
Estimate the volume of concrete a slab, path or footing needs, in cubic meters, cubic feet and cubic yards.
Scale an ingredient amount from the servings a recipe was written for to the number of servings you actually want.
Calculate expressions with parentheses, powers, roots, logarithms, and trigonometry in degrees or radians.
Split group expenses equally and calculate who pays whom after accounting for everyone’s contributions.
Find the non-negative remainder and integer quotient when one whole number is divided by another.
Raise a finite number to an integer power, including zero and negative exponents.
Percentage, discount, tip, sales tax and VAT calculators handle quick shopping math. Loan, mortgage, interest, savings goal, ROI and break-even calculators help you compare options, and the salary, overtime, time card and work hours calculators turn shifts into totals. Results are estimates, not tax or financial advice.
Fraction, ratio, exponent, modulo, GCD/LCM, prime number and quadratic formula calculators cover schoolwork and quick checks. Average, median, mode and standard deviation summarize a list of numbers, and the probability and combinations calculators count outcomes. The scientific calculator evaluates whole expressions with a safe parser.
Age, date difference, business days, day of the week and date add/subtract calculators work from the calendar. BMI, pace and GPA calculators handle personal numbers, while the paint, concrete, square footage, electricity cost and fuel cost calculators estimate materials and bills before you start a project.