Arithmetic Calculators
Arithmetic is the maths you meet every day: a percentage on a receipt, a fraction in a recipe, a long division you want to check. The calculators here do those jobs. The main ones show the working, so you can see where an answer comes from and find the line where your own went wrong.
For percentages, start with the percentage calculator. It answers the three basic questions (a percent of a number, what percent one number is of another, and the whole from a part) and adds or takes off a percentage. Percent change, percent difference and percent error are three different formulas that are easy to mix up, so each has its own page that says when to use it.
For fractions, the fractions calculator adds, subtracts, multiplies and divides fractions and mixed numbers. Two converters go between the forms: decimal to fraction, including repeating decimals, and fraction to decimal. The long division calculator sets the working out the way you would write it on paper.
The rest of the list covers square roots, absolute value, factors and the greatest common factor, remainders, sums, ratios, proportions, unit rates and place value.
All arithmetic calculators
- Absolute Value CalculatorThe absolute value |x| of any number.
- Complex Fraction CalculatorSimplify a fraction whose top or bottom is itself a fraction.
- Decimal to Fraction CalculatorA decimal as a fraction in lowest terms, including repeating decimals, step by step.
- Expanded Form CalculatorA number written as the sum of its place values.
- Factor CalculatorEvery factor of a whole number, its factor pairs and its prime factorization.
- Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers, step by step.
- Fraction to Decimal CalculatorA fraction or mixed number as a decimal, with the division steps and repeating digits marked.
- GCF CalculatorGreatest common factor of two or more whole numbers.
- Long Division CalculatorLong division written out digit by digit, with the remainder and the decimal answer.
- Modulus CalculatorThe remainder a mod n, with negative numbers handled the mathematical way.
- Percent Change CalculatorPercent increase or decrease from an old value to a new one, step by step.
- Percent Difference CalculatorPercent difference between two values, measured against their average, step by step.
- Percent Error CalculatorPercent error of a measurement against the accepted value, step by step.
- Percent to Decimal CalculatorPercent to decimal, and decimal back to percent.
- Percent to Fraction CalculatorA percent as a fraction in lowest terms, with the steps.
- Percentage CalculatorPercent of a number, what percent one number is of another, and percentage increase or decrease, step by step.
- Proportion CalculatorSolve a/b = c/d for the missing value by cross-multiplying.
- Scientific Notation ConverterDecimal to scientific notation (standard form) and back.
- Square Root CalculatorSquare roots, cube roots and nth roots, with simplified radicals.
- Sum CalculatorAdd up a list of numbers.
- Unit Rate CalculatorAmount per one unit: miles per hour, price per item and so on.