Percentage Calculation
Percentage = (part/whole) × 100
Calculate what percentage one number is of another
Percentage Increase/Decrease
Percentage Change = ((New Value - Old Value) ÷ Old Value) × 100
Calculate percentage increase or decrease between two values
Add Fractions
a/b + c/d = (ad + bc) / bd
Add two fractions and simplify the answer
Simplify Fraction
a/b ÷ HCF(a, b) = simplest form
Reduce a fraction to its lowest terms
Multiply Fractions
a/b × c/d = ac / bd
Multiply two fractions and simplify the answer
Divide Fractions
a/b ÷ c/d = ad / bc
Divide one fraction by another using the reciprocal
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Subtract Fractions
a/b - c/d = (ad - bc) / bd
Subtract one fraction from another and simplify
HCF / GCD Calculator
HCF(a, b) = largest number dividing both a and b
Find the Highest Common Factor (Greatest Common Divisor) of two numbers
LCM Calculator
LCM(a, b) = (a × b) ÷ HCF(a, b)
Find the Lowest Common Multiple of two numbers
Marks Percentage Calculator
Percentage = (Marks Obtained ÷ Total Marks) × 100
Calculate exam percentage and grade from marks scored
GPA Calculator
GPA = Total Grade Points ÷ Total Credits
Calculate grade point average from total grade points and credit hours
Exponent Calculator
result = baseⁿ
Raise a number to a power
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Square Root
√n
Find the square root of a number
Cube Root
∛n
Find the cube root of a number
Age Calculator
Age = Current Year - Birth Year
Calculate age from birth year
Length Unit Converter
Various conversion factors
Convert between different units of length (meters, feet, inches, etc.)
Ratio Simplifier
a : b = (a ÷ HCF) : (b ÷ HCF)
Reduce a ratio to its simplest whole-number form
Proportion Solver
a/b = c/x → x = (b × c) / a
Solve for the missing value in a proportion using cross multiplication
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Prime Factorization
n = p₁ × p₂ × p₃ × ...
Break a number down into its prime factors
Basic Addition
Sum = a + b
Add two numbers together
Basic Subtraction
Difference = a - b
Subtract one number from another
Basic Multiplication
Product = a × b
Multiply two numbers
Basic Division
Quotient = a ÷ b
Divide one number by another
Scientific Notation
n = m × 10ᵏ where 1 ≤ |m| < 10
Write a number in scientific notation
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Division with Remainder
dividend = divisor × quotient + remainder
Divide two whole numbers and find the quotient and remainder
Roman Numeral Converter
Place-value substitution with I, V, X, L, C, D, M
Convert a whole number from 1 to 3999 into Roman numerals
Number Base Converter
Convert a value between number bases 2-10 via decimal
Convert a whole number (e.g. binary, octal, decimal) between number bases 2 through 10
Times Table Generator
Multiples of n from 1 to 12
Generate the multiplication table for a number from 1 to 12
Prime Number Checker
n is prime if it has no divisors other than 1 and itself
Check whether a whole number is a prime number
Weight Unit Converter
Various conversion factors
Convert between different units of weight (kilograms, grams, pounds, ounces, metric tons)
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Temperature Unit Converter
Convert via Celsius as the common base
Convert a temperature between Celsius, Fahrenheit and Kelvin
Volume Unit Converter
Various conversion factors
Convert between different units of volume (liters, milliliters, gallons, cups, cubic meters)
Speed Unit Converter
Various conversion factors
Convert between different units of speed (m/s, km/h, mph, knots)
Rounding Calculator
Round x to n decimal places (half away from zero)
Round a number to any number of decimal places, and see it rounded to significant figures, the nearest 10, 100 and 1000
Percentage Error Calculator
% error = |measured − actual| ÷ |actual| × 100
How far a measured or estimated value is from the true value, as a percentage
