Browse our complete library of 315 free calculators.
Calculate 13th month pay and tax-exempt threshold.
Calculate alcohol by volume for homebrewing.
Perform one-way analysis of variance.
Calculate the Annual Percentage Rate for a loan.
Find the absolute value of any real number.
Solve equations containing absolute value expressions.
Calculate acceleration using a=(v-u)/t.
Calculate activation energy from rate constants at two temperatures.
Add or subtract time from a date or duration.
Add two or more fractions with different denominators.
Calculate your exact age in years, months, and days.
Find your exact age in total days.
Check if two numbers are amicable.
Count unique letter arrangements of a word.
Convert between degrees, radians, and gradians.
Calculate present and future value of annuity payments.
Find the arc length of a circle from radius and angle.
Convert between square meters, acres, hectares, and more.
Calculate the area and circumference of a circle.
Find the area and perimeter of a rectangle.
Calculate the area and perimeter of a square.
Calculate the area of a trapezoid.
Calculate the area of a triangle using base and height or Heron's formula.
Find missing dimension from aspect ratio and one side.
Calculate tons of asphalt for a paving project.
Calculate monthly car loan payments and total interest.
Calculate the mean, median, and mode of a data set.
Calculate your Body Mass Index and weight category.
Calculate BMI Prime ratio relative to upper normal weight.
Calculate your Basal Metabolic Rate.
Find ingredient substitutions for baking.
Perform basic arithmetic: add, subtract, multiply, divide.
Calculate conditional probability using Bayes theorem.
Calculate maximum deflection of beams under load.
Convert between binary, decimal, hex, and octal.
Calculate binomial probabilities P(X=k).
Find probability that two people in a group share a birthday.
Price call and put options using the Black-Scholes model.
Estimate BAC from drinks, weight, and time.
Estimate body fat percentage using the US Navy method.
Calculate BSA using the Mosteller formula.
Calculate current yield and yield to maturity for bonds.
Apply Boyle's law to find pressure or volume of a gas.
Calculate dough hydration percentage for bread recipes.
Find break-even units and revenue for your business.
Calculate the number of bricks for a wall or project.
Create a simple monthly budget and track income vs expenses.
Calculate buffer pH using Henderson-Hasselbalch equation.
Calculate the buoyant force on a submerged object.
Count working days between two dates.
Calculate compound annual growth rate.
Estimate daily calorie needs based on weight and activity.
Estimate calories burned during common exercises.
Calculate calories per serving in a recipe.
Calculate capacitance, charge, or voltage for a capacitor.
Calculate RC circuit charge time and voltage.
Estimate your annual carbon footprint.
Calculate card draw probabilities using hypergeometric distribution.
Calculate centripetal force, acceleration, and velocity.
Apply Charles's law to find temperature or volume.
Calculate the chi-square statistic for categorical data.
Calculate area, circumference, arc length, and sector area.
Calculate the angle between clock hands at any time.
Calculate coffee-to-water ratio for any brew size.
Calculate the probability of exactly k heads in n flips.
Generate the Collatz sequence for any starting number.
Calculate the number of combinations (nCr).
Solve P1V1/T1=P2V2/T2 for the unknown variable.
Compare two fractions and determine which is larger.
Convert a quadratic to vertex form by completing the square.
Calculate compound interest growth over time.
Calculate molar concentration from mass, molar mass, and volume.
Calculate concentration ratios for market analysis.
Calculate concrete volume for slabs, footings, and columns.
Calculate P(A|B) given P(A∩B) and P(B).
Calculate a confidence interval for a population mean.
Estimate cooking time based on weight and method.
Convert between cups, tablespoons, teaspoons, and ml.
Analyze lines and points using coordinate geometry formulas.
Calculate Pearson's r between two variables.
Create a countdown to any future date.
Find the expected number of purchases to complete a set.
Calculate win probability for craps bets.
Find out how long to pay off a credit card balance.
Calculate the cube root of any number.
Convert amounts between major world currencies.
Calculate the current ratio for financial liquidity.
Convert between bits, bytes, KB, MB, GB, and TB.
Find the number of days, months, and years between two dates.
Find what day of the week a date falls on.
Count days since a past event or date.
Count days until a future event or date.
Calculate your debt-to-income ratio.
Convert a decimal number to a fraction.
Convert a decimal to a percentage.
Calculate decking boards needed for an outdoor deck.
Calculate a new value after a percentage decrease.
Calculate density, mass, or volume of a substance.
Calculate asset depreciation using multiple methods.
Calculate the determinant of a 2×2 or 3×3 matrix.
Find the diagonal length of a rectangle or square.
Calculate the expected sum and statistics for rolling dice.
Calculate the probability of rolling a target sum.
Calculate the sum of digits of any number.
Calculate diluted solution concentration using C1V1=C2V2.
Find the sale price after applying a percentage discount.
Calculate the distance between two points in 2D space.
Divide one fraction by another.
Check divisibility rules for 2, 3, 4, 5, 6, 9, 10.
Calculate the Doppler shift of sound or light frequency.
Calculate drywall sheets needed for a room.
Calculate pregnancy due date from conception date.
Calculate electric power P=VI.
Calculate electricity bill from kWh usage and rate.
Calculate mass deposited using Faraday's Law.
Convert between joules, calories, BTU, kWh, and more.
Solve linear, quadratic, and systems of equations.
Find fractions equivalent to a given fraction.
Find ratios equivalent to a given ratio.
Determine if a number is even or odd.
Calculate cubic yards of soil to excavate.
Calculate the expected value of a probability distribution.
Raise any base to any power and see the result.
Calculate the factorial of any non-negative integer.
Calculate materials needed for a fence installation.
Calculate Fibonacci sequence numbers.
Calculate min, Q1, median, Q3, and max.
Calculate square footage for flooring projects.
Calculate fluid flow rate through a pipe.
Look up calories in common foods.
Calculate force using Newton's second law F=ma.
Convert between newtons, pounds-force, and dynes.
Add, subtract, multiply, and divide fractions step by step.
Calculate a fraction raised to a power.
Visualize and compare fractions using fraction strips.
Convert a fraction to its decimal equivalent.
Convert a fraction to a percentage.
Find how long foods can be safely stored frozen.
Calculate frequency, period, or wave speed.
Convert between Hz, kHz, MHz, and GHz.
Calculate trip fuel cost from distance, efficiency, and price.
Convert between mpg, km/L, and L/100km.
Evaluate a function at a given input value f(x).
Find the greatest common factor of two or more numbers.
Calculate the probability of reaching a target before going broke.
Calculate gear ratios, RPM, and torque transfer.
Calculate golden ratio dimensions from one measurement.
Calculate your exam or test grade as a percentage.
Calculate tons of gravel or crushed stone needed.
Calculate gravitational attraction between two masses.
Find target heart rate zones for exercise.
Calculate heat released or absorbed using q=mcΔT.
Convert hexadecimal to decimal and other bases.
Calculate total hours and minutes between two times.
Perform one-sample and two-sample Z/T hypothesis tests.
Calculate Internal Rate of Return for an investment.
Solve PV=nRT for pressure, volume, moles, or temperature.
Find your ideal body weight range.
Convert between lux, foot-candles, and phot.
Convert between improper fractions and mixed numbers.
Calculate a new value after adding a percentage increase.
Calculate probability of multiple independent events.
Solve and graph simple linear inequalities.
Adjust past or future dollar amounts for inflation.
Calculate insulation R-value and material needed.
Find all partitions of a positive integer.
Find the IQR of a dataset.
Find the inverse of a simple function f(x).
Estimate the future value of an investment portfolio.
Calculate kinetic energy KE=½mv².
Find the least common multiple of two or more numbers.
Calculate lean body mass from total weight and body fat.
Convert between meters, feet, inches, miles, and more.
Solve a single linear equation for the unknown variable.
Calculate your monthly loan payment with interest.
Calculate log base 10, natural log, or any custom base.
Perform long division with step-by-step remainders.
Calculate your odds of winning a lottery jackpot.
Calculate board feet of lumber needed for a project.
Calculate daily protein, carb, and fat targets.
Convert map distances to real distances using a scale.
Calculate gross margin from revenue and cost.
Calculate selling price from cost and markup percentage.
Add, subtract, and multiply 2×2 or 3×3 matrices.
Calculate the arithmetic mean of a data set.
Estimate thawing time for frozen meat.
Find the median value of a data set.
Find a common meeting time across multiple time zones.
Find the midpoint between two coordinate points.
Perform arithmetic with mixed numbers.
Calculate amounts needed when mixing two solutions by ratio.
Find the most frequently occurring value in a data set.
Find the remainder when dividing two integers.
Calculate the molar mass from sample mass and moles.
Calculate molar concentration of a solution.
Calculate moles from mass and molar mass.
Calculate linear momentum p=mv.
Analyze win probability for the Monty Hall problem.
Estimate your monthly mortgage payment including taxes and insurance.
Calculate how many bags of mulch you need.
Multiply two fractions together.
Calculate Net Present Value of a series of cash flows.
Calculate your total net worth from assets and liabilities.
Calculate PDF, CDF and probabilities for any normal distribution.
Calculate the nth root of a number.
Convert numbers between any two bases (2–36).
Convert any number to its written English words.
Calculate macronutrient totals for a meal.
Convert octal numbers to decimal and binary.
Solve for voltage, current, or resistance using V=IR.
Calculate your 1RM from reps and weight lifted.
Sort a list of fractions from smallest to largest.
Calculate osmotic pressure using π=MRT.
Convert oven temperatures between F, C, and gas marks.
Estimate ovulation dates from your menstrual cycle.
Find the p-value for a z-score or t-score.
Calculate your running pace per mile or kilometer.
Calculate HDMF/Pag-IBIG monthly contributions.
Calculate how many gallons of paint to buy.
Check if a number or word reads the same forward and backward.
Calculate water and salt needed to cook pasta.
Calculate simple and discounted payback period.
Determine the regular payment for any loan amount.
Calculate pendulum period, length, and frequency.
Calculate percent by mass of an element in a compound.
Find the price after a percent-off discount.
Convert a percentage to a fraction.
Calculate percentages: find %, of, or change.
Calculate percentage increase or decrease between two values.
Find the percentage difference between two numbers.
Calculate the percentage error of a measurement.
Find what percentage a part is of the whole.
Convert a percentage to its decimal equivalent.
Find what percentile a value falls in a dataset.
Calculate the perimeter of common shapes.
Calculate the number of permutations (nPr).
Calculate PhilHealth monthly contributions.
Calculate BIR income tax under the TRAIN Law.
Calculate 12% VAT inclusive or exclusive.
Resize photos while maintaining aspect ratio.
Find the line equation from a point and slope.
Find the probability of any 5-card poker hand.
Calculate the area of regular and irregular polygons.
Add, subtract, and multiply polynomials.
Calculate correct portion sizes for a meal.
Calculate gravitational potential energy PE=mgh.
Calculate mechanical power P=W/t.
Convert between watts, horsepower, BTU/hr, and more.
Estimate due date and pregnancy week from last period.
Calculate pressure from force and area P=F/A.
Convert between Pa, psi, bar, atm, and mmHg.
Calculate the P/E ratio of a stock.
Break any integer into its prime factors.
Check if a number is prime or composite.
Generate a list of prime numbers up to a given limit.
Calculate basic probability of single and compound events.
Calculate P(at least one success) in n trials.
Analyze projectile motion with initial velocity and angle.
Solve proportions: find the missing value in a/b = c/d.
Calculate daily protein intake requirements.
Solve for any side of a right triangle using a²+b²=c².
Calculate pH from hydrogen ion concentration.
Calculate pOH from hydroxide ion concentration.
Solve quadratic equations using the quadratic formula.
Find the fiscal or calendar quarter for any date.
Calculate the acid-test (quick) ratio.
Calculate return on investment as a percentage.
Generate random integers in a custom range.
Generate random integers within a custom range.
Simplify ratios and find equivalent ratios.
Reduce a ratio to its simplest form.
Solve ratio and proportion word problems.
Convert a ratio to a fraction.
Calculate theoretical, actual, and percent yield.
Calculate rebar needed for a concrete slab.
Scale a recipe up or down by any factor.
Scale any recipe up or down by a custom multiplier.
Perform simple linear regression on a dataset.
Calculate properties of a regular polygon.
Decode or encode resistor color bands to find resistance.
Calculate blocks needed for a retaining wall.
Find the original value before a percentage change.
Calculate Reynolds number to determine flow regime.
Solve all parts of a right triangle from two known values.
Convert between Arabic and Roman numerals.
Calculate roofing material for a sloped roof.
Calculate win probability and house edge for roulette bets.
Round numbers to decimal places, significant figures, or a nearest value.
Calculate SSS monthly contributions for employee and employer.
Find the total price after sales tax is applied.
Count ordered and unordered samples with or without replacement.
Project future savings with regular monthly deposits.
Calculate how much to save each month to reach your goal.
Find the scale factor between two similar figures.
Convert numbers to and from scientific notation.
Calculate the area of a circle sector.
Round a number to a given number of significant figures.
Calculate simple interest on a principal amount.
Reduce a fraction to its simplest form.
Calculate the best bedtime or wake-up time.
Find the slope of a line between two points.
Graph y=mx+b and convert between line equation forms.
Calculate specific heat capacity from q, mass, and ΔT.
Convert between mph, km/h, m/s, knots, and ft/s.
Calculate the square root of any number to high precision.
Calculate stair rise, run, and number of steps.
Calculate population or sample standard deviation.
Calculate moles of product from moles of reactant.
Calculate the student-to-teacher ratio for a classroom.
Subtract fractions with different denominators.
Calculate sugar and water for simple syrup ratios.
Calculate the total surface area of common 3D shapes.
Divide a polynomial by a linear factor using synthetic division.
Solve 2×2 systems of linear equations.
Perform a one-sample or two-sample t-test.
Calculate Total Daily Energy Expenditure and macro split.
Calculate tax rate from total and pre-tax amount.
Convert between Celsius, Fahrenheit, and Kelvin.
Calculate thermal resistance of materials.
Calculate the number of tiles needed for a floor or wall.
Calculate total hours from a weekly time card.
Convert between seconds, minutes, hours, days, and weeks.
Calculate the duration of an event in hours and minutes.
Convert times between world time zones.
Calculate tip amount and split the bill among multiple people.
Find what percentage to tip based on bill and tip amount.
Calculate torque from force and distance.
Convert between N·m, ft·lb, and in·lb.
Solve any triangle given SSS, SAS, ASA, or AAS.
Calculate the unit rate from a ratio.
Convert Unix timestamps to human-readable dates.
Estimate maximum oxygen uptake from a fitness test.
Calculate population or sample variance.
Solve direct, inverse, and joint variation problems.
Add, subtract, and compute dot and cross products of vectors.
Calculate velocity, distance, or time using v=d/t.
Convert between volts, millivolts, and kilovolts.
Calculate output voltage from a resistor voltage divider.
Calculate the volume of spheres, cylinders, cones, cubes, and prisms.
Convert between liters, gallons, cups, fluid ounces, and more.
Find the volume and lateral area of a cone.
Calculate the volume and surface area of a cube.
Calculate the volume and surface area of a cylinder.
Find the volume and surface area of a sphere.
Calculate waist-to-height ratio and health risk.
Calculate daily water intake needs.
Calculate wavelength from frequency and wave speed.
Find the ISO week number for any date.
Convert between kg, pounds, ounces, stone, and more.
Suggest wine pairings for common foods.
Convert wire gauge to diameter, area, and current rating.
Calculate work done by a force W=Fd.
Calculate total work hours including lunch breaks.
Convert between fresh, active dry, and instant yeast.
Convert a data point to a standard z-score.