Basic Calculator
Perform everyday arithmetic with a clear expression history and reusable results.
Math & number toolsOpenMath & number tools
Math and number tools
Solve everyday arithmetic, percentages, equations, statistics, matrices and number conversions.
20 focused tools
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Scientific Calculator
Evaluate scientific calculator expressions and review the computed result in the browser.
Math & number toolsOpenPercentage Calculator
Calculate percentages, percentage increase or decrease and reverse percentages from the original and final values.
Math & number toolsOpenRatio and Proportion Calculator
Solve proportion using a, b, c, and d (leave zero to solve), then review the result and supporting breakdown.
Math & number toolsOpenFraction Calculator
Calculate fractions using numerator 1, denominator 1, operation, numerator 2, and denominator 2, then review the result and supporting breakdown.
Math & number toolsOpenAverage and Statistics Calculator
Calculate mean, median, mode and range from a list of numbers with a clear statistical summary.
Math & number toolsOpenStandard Deviation and Variance Calculator
Analyse numbers using numbers, then review the result and supporting breakdown.
Math & number toolsOpenRounding and Significant Figures Calculator
Round number using number, method, and places or figures, then review the result and supporting breakdown.
Math & number toolsOpenPrime Number and Factorisation Checker
Check whether a whole number is prime and inspect its factorisation when factors are available.
Math & number toolsOpenGCD and LCM Calculator
Calculate gcd and lcm using whole numbers, then review the result and supporting breakdown.
Math & number toolsOpenNumber Sequence Analyser
Analyse a numeric sequence to identify its pattern and review the detected relationship between values.
Math & number toolsOpenEquation Solver
Solve ax + b = c using coefficient a, constant b, and right side c.
Math & number toolsOpenQuadratic Equation Calculator
Solve quadratic using a, b, and c, then review the result and supporting breakdown.
Math & number toolsOpenSimultaneous Equation Solver
Solve equations using a₁, b₁, c₁, a₂, b₂, and c₂.
Math & number toolsOpenMatrix Calculator
Calculate matrix using operation, a11, a12, a21, a22, and b11, then review the result and supporting breakdown.
Math & number toolsOpenProbability Calculator
Calculate probability using favourable outcomes, total outcomes, and number of independent trials, then review the result and supporting breakdown.
Math & number toolsOpenPermutation and Combination Calculator
Calculate npr and ncr using n and r, then review the result and supporting breakdown.
Math & number toolsOpenNumber Base Converter
Convert values between binary, decimal, octal and hexadecimal number systems with instant validation.
Math & number toolsOpenRoman Numeral Converter
Convert whole numbers to Roman numerals or Roman numerals back to numbers.
Math & number toolsOpenNumber to Words Converter
Convert a whole number into written words for easier reading or reuse.
Math & number toolsOpenWhat this category covers
Math and number tools cover arithmetic, percentages, sequences and numeric formatting. They provide quick working for learning, checking and everyday calculations without hiding the requested operation.
Recommended starting tools
- Basic Calculator — Perform everyday arithmetic with a clear expression history and reusable results.
- Percentage Calculator — Calculate percentages, percentage increase or decrease and reverse percentages from the original and final values.
- Number to Words Converter — Convert a whole number into written words for easier reading or reuse.
How to choose
Use a dedicated percentage or conversion tool when units or interpretation matter; use the basic calculator for direct arithmetic.
Frequently asked questions
Does the calculator show operation precedence?
The basic calculator evaluates supported expressions according to its documented operator rules.
Should rounded values be reused?
Keep unrounded source values for later calculations when accuracy matters.