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Free calculators for maths, physics, health and money, with clear step-by-step working. No sign-up needed.
All tools
Pick a tool and get your answer in seconds.
Basic Calculator
Add, subtract, multiply, divide and percent, with exact answers and history.
Open tool โScientific Calculator
Trig, logs, powers, roots, factorials and memory, in degrees or radians.
Open tool โGPA Calculator
Add your courses, credits and grades. Instant GPA on a 5.0 scale.
Open tool โCGPA Calculator
Add each semester's GPA and credits to get your overall CGPA.
Open tool โGrade Calculator
Enter the points you earned and the total possible points.
Open tool โFinal Grade Calculator
Enter your current grade, target grade, and the weight of your current work.
Open tool โStudy Time Calculator
Enter your available study minutes and number of subjects.
Open tool โPercentage Calculator
Enter a number and the percentage you want to calculate.
Open tool โFraction Calculator
Use fractions such as 3/4 and 2/3.
Open tool โAverage Calculator
Separate numbers with commas.
Open tool โAge Calculator
Choose your date of birth.
Open tool โDate Calculator
Choose a start date and an end date.
Open tool โTime Duration Calculator
Choose a start and end time.
Open tool โCountdown Calculator
Choose a future target date.
Open tool โSavings Goal Calculator
Enter your target, current savings and months remaining.
Open tool โSalary Calculator
Choose the salary amount and how often you are paid.
Open tool โDiscount Calculator
Enter the original price and discount percentage.
Open tool โTip Calculator
Enter the bill amount and tip percentage.
Open tool โTax Calculator
This is a general calculator, not jurisdiction-specific tax advice.
Open tool โCurrency Converter
Enter an amount and the current rate: target currency per 1 unit of source currency.
Open tool โUnit Converter
Choose a conversion and enter a value.
Open tool โBMI Calculator
Check your BMI in metric or US units, with your healthy weight range.
Open tool โAlgebra Solver
Type any expression or equation. Get it simplified, factorised or solved, with steps and a graph.
Open tool โLinear Equation Calculator
Solve equations like 3x + 5 = 20 with every step shown.
Open tool โQuadratic Equation Calculator
Enter a, b and c. Get the roots, vertex, factors, steps and a graph.
Open tool โSimultaneous Equations Calculator
Solve 2, 3 or more linear equations at once, with the elimination steps.
Open tool โChange the Subject of a Formula
Rearrange any formula, like v = u + at, to make a different letter the subject.
Open tool โArea Calculator
Find the area of 11 shapes with the formula, working and unit conversions.
Open tool โVolume Calculator
Volume and surface area of cubes, cylinders, cones, spheres and more.
Open tool โSlope Calculator
Slope, line equation, distance, midpoint and a graph from two points.
Open tool โCalorie Calculator
Estimate the daily calories you need to lose, maintain or gain weight.
Open tool โStatistics Calculator
Mean, median, mode, range, quartiles and standard deviation with working.
Open tool โPermutation and Combination Calculator
Work out nPr, nCr and factorials with the full working.
Open tool โSequence Calculator
Arithmetic and geometric sequences: the nth term, the sum and more.
Open tool โLogarithm Calculator
Logarithms to any base, with the working and the exact answer when there is one.
Open tool โExponent Calculator
Powers with whole, negative, decimal or fraction exponents.
Open tool โSurd Calculator
Simplify square roots, rationalise denominators and add or subtract surds.
Open tool โMatrix Calculator
Determinant, inverse, transpose and adjugate of 2 ร 2 and 3 ร 3 matrices.
Open tool โInequality Calculator
Solve linear and quadratic inequalities with interval notation and a graph.
Open tool โWord Problem Solver
Age, number, ratio, speed, work, rectangle and cost problems, solved step by step.
Open tool โEquations of Motion Calculator (SUVAT)
Give any 3 of s, u, v, a, t and find the other 2 with full working.
Open tool โProjectile Motion Calculator
Range, time of flight and maximum height with a graph of the path.
Open tool โSpeed, Distance and Time Calculator
Find speed, distance or time in km/h, m/s or mph.
Open tool โForce Calculator (Newton's Laws)
F = ma, weight, friction and springs, solved for any unknown.
Open tool โMomentum and Impulse Calculator
Momentum, impulse and collisions with conservation of momentum.
Open tool โWork, Energy and Power Calculator
Work, power, kinetic and potential energy and efficiency.
Open tool โDensity and Pressure Calculator
Density, pressure, liquid pressure and upthrust.
Open tool โOhm's Law and Resistor Calculator
Voltage, current, resistance, power, and series and parallel resistors.
Open tool โWave Speed Calculator
Wave speed, frequency, wavelength and period.
Open tool โSpecific Heat Capacity Calculator
Heat energy for temperature change and change of state.
Open tool โGravitation Calculator
Gravitational force and field strength between masses.
Open tool โLens and Mirror Calculator
Focal length, image distance and magnification.
Open tool โSimple Machines Calculator
Mechanical advantage, velocity ratio and efficiency.
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