Maths and science calculators

All tools 67

From percentages and fractions to matrices, distributions, hypothesis tests, motion and chemistry.

• Percentage Calculator

  Find percentages, shares, changes and original values, with the right base made clear.

• Fraction Calculator

  Add, subtract, multiply and divide fractions and mixed numbers with exact steps.

• Scientific Calculator

  Type a full calculation with brackets, powers, roots, logs and trigonometry.

• Average Calculator

  Compare mean, median, repeated modes and an optional weighted average from your list.

• LCM & HCF Calculator

  Find the LCM and HCF (GCD) of up to 20 numbers, with prime factors and Euclid’s steps.

• Quadratic Formula Calculator

  Solve ax² + bx + c = 0 with the discriminant, exact surd form, complex roots and vertex.

• Standard Deviation Calculator

  Find the sample or population standard deviation of a list, with variance, mean and standard error.

• Ratio Calculator

  Simplify a ratio to lowest terms, or solve A : B = C : x to scale it.

• Area Calculator

  Find the area of six common shapes in your unit, square metres, square feet and gaj.

• Big Number Calculator

  Add, subtract, multiply, divide and raise whole numbers of any length, exactly.

• Binary Calculator

  Add, subtract, multiply, divide, AND, OR or XOR binary numbers exactly, with the answer in every base.

• Binomial Distribution Calculator

  Find exact, at-most and at-least binomial probabilities, with the mean and standard deviation.

• Chi-Square Calculator

  Run a chi-square goodness-of-fit test or test of independence, with χ², degrees of freedom and p-value.

• Circle Calculator

  Find radius, diameter, circumference and area of a circle from any one of them.

• Complex Number Calculator

  Add, subtract, multiply and divide complex numbers, with modulus, argument and polar form.

• Confidence Interval Calculator

  Find the confidence interval for a mean or a proportion, with the margin of error.

• Cubic Equation Calculator

  Solve ax³ + bx² + cx + d = 0 for all three roots, real or complex, with the discriminant.

• Decibel Calculator

  Add identical sound sources and find the level at a new distance, with the inverse-square law.

• Density Calculator

  Find density, mass or volume from the other two, in g/cm³ and kg/m³.

• Dew Point Calculator

  Find the dew point from temperature and humidity, or the humidity from the dew point.

• Distance Calculator

  Find the distance and midpoint between two points in 2D or 3D, with the exact square-root form.

• Exponent Calculator

  Raise any number to any power: whole, negative or fractional exponents, explained.

• Factor Calculator

  List every factor and factor pair of a whole number, with the count, sum and kind.

• GDP Calculator

  Add up GDP from consumption, investment, government and net exports, or turn nominal GDP into real GDP.

• Gravitational Force Calculator

  Find the gravitational pull between two masses with Newton’s law, and each body’s field.

• Half-Life Calculator

  Find the amount left, the time, the half-life or the starting amount in exponential decay.

• Hex Calculator

  Add, subtract, multiply, divide, AND, OR or XOR hexadecimal numbers exactly, with the answer in every base.

• Ideal Gas Law Calculator

  Solve PV = nRT for pressure, volume, moles or temperature, with unit conversions shown.

• Kinematics Calculator

  Find final velocity, displacement and stopping distance for constant acceleration in a straight line.

• Kinetic Energy Calculator

  Find the kinetic energy and momentum of a moving object from its mass and speed.

• Linear Regression Calculator

  Fit the least-squares line to x, y data, with slope, intercept, r, r² and a prediction.

• Log Calculator

  Find the logarithm of any number in any base, with ln, log₁₀ and log₂ alongside.

• Long Division Calculator

  Divide whole numbers step by step, with the remainder and the exact recurring decimal.

• Matrix Calculator

  Add, multiply, invert and find determinants of matrices up to 8 × 8, in exact fractions.

• Molarity Calculator

  Find a solution’s molarity from moles or mass, or after a dilution.

• Molecular Weight Calculator

  Find the molar mass of any formula, with brackets, hydrates and each element’s share.

• Normal Distribution Calculator

  Find the probability between two values of a normal distribution, and the value at any percentile.

• Number Sequence Calculator

  Find the nth term and the sum of an arithmetic or geometric sequence.

• P-value Calculator

  Find the p-value of a z or t test statistic, left, right or two-tailed, and compare it with α.

• Pendulum Calculator

  Find a pendulum’s period from its length and gravity, exactly at any amplitude, not just small swings.

• Percent Error Calculator

  Find the percent error between a measured and an expected value, and whether you were over or under.

• Percentile Calculator

  Find any percentile and quartile of a data set by the OpenStax or Excel methods, and a value’s percentile rank.

• Permutation and Combination Calculator

  Count the ways to choose or arrange r items from n, with or without repeats, exactly.

• pH Calculator

  Turn pH, pOH, [H₃O⁺] or [OH⁻] into the other three, with acidic, neutral or basic shown.

• Poisson Distribution Calculator

  Find exact, at-most and at-least Poisson probabilities from an average rate.

• Prime Factorization Calculator

  Break any whole number up to 10¹² into prime factors, with powers and the number of divisors.

• Probability Calculator

  Combine the chances of two independent events, and of one happening at least once in many tries.

• Projectile Motion Calculator

  Find the range, flight time and maximum height of a projectile from its speed, angle and height.

• RC Time Constant Calculator

  Find an RC circuit’s time constant and the capacitor voltage at any moment, charging or discharging.

• Root Calculator

  Find square, cube and any n-th root, with the exact simplified radical form for whole numbers.

• Rounding Calculator

  Round numbers to decimal places or significant figures exactly, half up, half even, up or down.

• Sample Size Calculator

  Find how many people to survey for a given confidence level and margin of error.

• Scientific Notation Calculator

  Write any number as a × 10ⁿ, in E notation and engineering form, rounded exactly to the figures you need.

• Series and Parallel Resistor Calculator

  Add up resistors in series and in parallel, with k and M values and the 4k7 style.

• Significant Figures Calculator

  Count significant figures and round to any number of them, by the OpenStax rules.

• Simple Interest Calculator

  Find simple interest, principal, rate or time, with days on actual/365, and compare it with compound interest.

• Slope Calculator

  Find the slope, equation, angle, distance and midpoint of the line through two points.

• Specific Heat Calculator

  Find the heat to warm or cool a substance from q = m c ΔT, in J, kcal and kWh, with heater time.

• Speed Calculator

  Find average speed, distance or time from the other two, in km/h, m/s or mph.

• System of Equations Calculator

  Solve 2 to 6 linear equations exactly, with elimination steps, or see when there is no unique solution.

• t-Test Calculator

  Compare two sample means with Welch’s t-test from summary statistics: t, degrees of freedom and p-value.

• Triangle Calculator

  Solve a triangle from three known sides and/or angles, including ambiguous SSA cases.

• Vector Calculator

  Find the dot product, cross product, angle, magnitudes, sum and difference of two 3D vectors.

• Volume Calculator

  Calculate volume and total surface area for ten common solid shapes, with unit conversions.

• Wavelength and Frequency Calculator

  Convert wavelength to frequency or back, and find each photon’s energy in joules and electronvolts.

• Weight Calculator

  Turn mass into weight on Earth, the Moon, Mars and every planet, with what a scale would read.

• Z-Score Calculator

  Find how many standard deviations a value is from the mean, with the normal probabilities below and above it.