Fraction calculator
For fraction operations when numerator and denominator should be retained.
30 tools
Maths calculators
School and applied maths: prime factorisation, division with remainder, roots of a quadratic equation, a proportion with one unknown, logarithms and Roman numerals. Integer tasks have stated precision and size limits; roots, logarithms and statistical results may be approximate. Each tool explains its own model and allowed inputs.
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Arithmetic progression calculator
The nth term and the sum of an arithmetic progression from the first term and the common difference.
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Maths calculators
Binomial probability calculator
Probability of exactly k, at most k and at least k successes in a run of independent trials.
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Maths calculators
Combinations and permutations calculator
Combinations and permutations, with or without repetition.
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Maths calculators
Confidence interval calculator
Confidence interval for a mean from sample size, standard deviation and confidence level.
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Maths calculators
Correlation coefficient calculator
Pearson correlation for two series, together with the regression line.
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Maths calculators
Dice probability calculator
Probability of rolling a given sum on several identical dice.
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Maths calculators
Absolute and relative difference
How much two values differ, in units and in per cent.
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Maths calculators
Divisors calculator
Positive divisors: the first 40, full count, sum and proper-divisor sum.
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Maths calculators
Factorial calculator
Exact n! for whole numbers up to 170.
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Maths calculators
Fibonacci calculator
The nth Fibonacci number, the sum of the series and the ratio between neighbours.
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Maths calculators
Fraction calculator
Add, subtract, multiply and divide fractions with exact reduction.
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Maths calculators
GCD and LCM calculator
Greatest common divisor and least common multiple of a list of numbers.
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Maths calculators
Geometric progression calculator
The n-th term, the sum of the series and the terms themselves.
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Maths calculators
Linear equation calculator
Solves ax + b = c and shows every step.
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Maths calculators
System of linear equations calculator
Solves a system of two linear equations in two unknowns by Cramer’s rule.
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Maths calculators
Logarithm calculator
Common, natural and any-base logarithms with a check.
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Maths calculators
Remainder calculator
Divide with remainder and see the quotient and the check.
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Maths calculators
Power and root calculator
Powers and roots within the supported real domain.
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Maths calculators
Prime factorisation calculator
Break a number into prime factors and count its divisors.
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Maths calculators
Probability calculator
Probability of an event, its complement and of two independent events.
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Maths calculators
Proportion calculator
Solve a : b = c : d for any of the four terms.
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Maths calculators
Quadratic equation calculator
Solve ax² + bx + c = 0 and see the discriminant.
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Maths calculators New
Quartile and percentile calculator
Quartiles, interquartile range, whisker bounds and outliers from a list of numbers.
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Maths calculators
Ratio calculator
Simplify a ratio and divide an amount in proportion.
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Maths calculators
Roman numeral converter
Convert between Roman and Arabic numbers, both ways.
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Maths calculators
Rounding calculator
Round to a chosen number of decimal places, to the nearest, down or up.
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Maths calculators
Sample size calculator
How many respondents you need for a given accuracy.
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Maths calculators
Mean, median and standard deviation calculator
Mean, median, mode, range and standard deviation for a list of numbers.
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Maths calculators
Weighted average calculator
An average that respects how much each value counts: grades, shares, volumes.
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Maths calculators
Z-score calculator
How many standard deviations a value sits away from the mean.
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Which calculation to choose
GCD and LCM calculator
For a common divisor or multiple of integers, for example when finding a common denominator.
What to prepare
Write down signs, numerators and nonzero denominators; use integers for GCD and LCM.
Common mistake
A decimal approximation is not always the exact fraction. Rounding does not make division by zero valid.
Popular calculators
New calculators
FAQ
Do the calculators show the working?
They show the intermediate figures — discriminant, quotient, number of divisors — so you can see where the answer came from.
What happens with negative numbers?
The rules depend on the task. For integer division with remainder, the remainder follows the dividend’s sign. Equations accept finite coefficients within their stated limits; other tools have their own sign rules.
Why are some values rejected?
Several tasks have a domain: you cannot divide by zero, take a logarithm of a non-positive number, or factorise one.
Categories
Finance
Loan, mortgage, compound interest, percentage and discount calculators for everyday money decisions.
Currency
Currency converter and popular pairs for quick travel, shopping and budget estimates.
Fitness
BMI, calories, running pace and one-rep max calculators for training and body metrics.
Home improvement
Tile, wallpaper, paint and laminate calculators for estimating materials before a project.
Date and time
Age and business day calculators for dates, planning and deadlines.
Business and marketing
Contribution margin, customer acquisition cost, average order value, returns and ad ROI.
Unit converters
Convert length, mass, temperature, pressure and other quantities between units.
Electronics calculators
Current, voltage, resistance, power and circuit supply.
Computer calculators
Download speed, bandwidth, frames, resolution and disk space.
Study calculators
Test percentages, the grade you need and reading speed.
Car calculators
Fuel consumption, power to weight, trip cost and speed.
Household calculators
Electricity use, tips and filling a pool.
Geometry calculators
Area, perimeter, volume and surface of flat and solid shapes.
Physics calculators
Force, energy, work, power and motion with stated units and models.
Chemistry calculators
Concentration, moles, dilution, pH and the ideal gas law.