Everyday Math Calculators
Quick answers for everyday math — percentages, unit conversions, and stats.
Number of Calculators: 45
- PercentageFind what a percent of a number is, what percent one number is of another, the reverse percentage, or the change and difference between two values.
- TipCalculate the tip amount, total bill, and per-person split for any bill, with optional tax and rounding.
- DiscountFind the sale price, amount saved, or original price for a percent-off, fixed-amount, or reverse discount, with optional stacking and sales tax.
- UnitConvert between length, weight, volume, temperature, area, speed, time, digital storage, pressure, energy, power, and angle units instantly.
- Grade Point Average (GPA)Calculate your weighted or unweighted GPA from a list of course grades and credit hours, fold in a previous cumulative GPA, or find the GPA you need this term to hit a target.
- FractionAdd, subtract, multiply, or divide two fractions (including mixed numbers), or convert a decimal to its simplest fraction.
- GradeFind the minimum score you need on a final exam to reach your target overall grade.
- Sales TaxAdd sales tax to a price, or work backward from a tax-included total to find the price before tax.
- StatisticsCalculate the mean, median, mode, range, variance, and standard deviation of any list of numbers.
- Random Number GeneratorGenerate one or more random whole numbers within a range, with or without repeats.
- Password GeneratorGenerate a strong, random password from a chosen mix of uppercase, lowercase, numbers, and symbols, with its entropy in bits and a plain-language strength rating.
- TriangleFind a triangle's area, perimeter, and all three angles from its three side lengths, plus whether it's equilateral, isosceles, or scalene, and acute, right, or obtuse.
- AreaCalculate the area (and perimeter or circumference) of a rectangle, square, circle, triangle, or trapezoid.
- VolumeCalculate the volume and surface area of a rectangular prism, cube, sphere, cylinder, or cone.
- Quadratic FormulaSolve any quadratic equation of the form ax² + bx + c = 0, including complex roots.
- Square Root / Nth RootFind the square root, cube root, or any nth root of a number, including real roots of negative numbers.
- MatrixAdd, subtract, multiply, transpose, or find the determinant of a matrix of any size, with a resizable grid input.
- Greatest Common Factor and Least Common MultipleFind the Greatest Common Factor (GCF) and Least Common Multiple (LCM) of two or more whole numbers.
- RatioSimplify a ratio to its lowest terms, or solve a proportion for its missing fourth term.
- RoundingRound a number to a set number of decimal places, significant figures, or the nearest multiple.
- ProbabilityFind the probability of a single event, or the combined probability of two independent events.
- Long DivisionDivide two whole numbers and see the quotient, remainder, decimal result, and the full step-by-step long division process.
- Z-ScoreFind a value's z-score and percentile within a normal distribution, given the distribution's mean and standard deviation.
- CircleFind a circle's radius, diameter, circumference, and area — enter any one of them and this calculator solves for the other three.
- Distance, Midpoint & SlopeFind the distance, midpoint, and slope between two coordinate points on a graph.
- Percent ErrorFind the percent error between an experimental (measured) value and a theoretical (accepted) value.
- Confidence IntervalFind the confidence interval for a population mean, given a sample's mean, standard deviation, and size.
- Sample SizeFind how many respondents or observations a survey needs to estimate a proportion within a chosen margin of error and confidence level.
- P-ValueFind the p-value for a given z-score in a one-tailed or two-tailed hypothesis test, and whether it is statistically significant.
- Prime FactorizationBreak a whole number down into its prime factors, and find out whether it is itself a prime number.
- Roman NumeralConvert a number to a Roman numeral, or a Roman numeral back to a number.
- Number BaseConvert a number between binary, octal, decimal, and hexadecimal.
- ScientificA full scientific calculator with trig functions, logarithms, exponents, factorial, and parentheses.
- Permutation and CombinationFind the number of permutations (nPr) and combinations (nCr) for choosing r items from a total of n.
- Scientific NotationConvert a standard number to scientific notation, or a scientific notation coefficient and exponent back to a standard number.
- Golf HandicapEstimate your golf handicap index from your recent scores using the official USGA World Handicap System formula.
- Dice RollerRoll any number of dice with any number of sides, plus an optional modifier — see the total and every individual roll.
- DensitySolve for density, mass, or volume from the other two, in your choice of common mass and volume units.
- SpeedSolve for speed, distance, or time from the other two, in your choice of common distance and speed units.
- IP SubnetFind the network address, broadcast address, subnet mask, and usable host range for an IPv4 address and CIDR prefix.
- Resistor Color CodeDecode a 4-band resistor color code into its resistance in ohms, kilohms, or megohms, plus its tolerance range.
- Bandwidth (Download Time)Estimate how long a file transfer will take from the file size and your connection speed.
- Dew PointEstimate dew point from air temperature and relative humidity using the Magnus formula.
- Feels Like TemperatureCalculate wind chill for cold, windy conditions or heat index for hot, humid conditions, using the official National Weather Service formulas.
- Pet AgeConvert your dog's or cat's age into human-year equivalent using the published veterinary age charts.