Decimals & Rounding

Convert between fractions, decimals and percents, and round or estimate to any place value, with the conversion shown step by step. Try “convert 5/8 to a decimal and a percent”.

Try an example:

How the Decimals & Rounding works

  1. Fraction to decimal: divide the numerator by the denominator (5 ÷ 8 = 0.625).
  2. Decimal to percent: multiply by 100 (62.5%).
  3. To round, look at the digit after your target place: 5 or more rounds up.

Frequently asked questions

How do you convert a decimal to a fraction?

Write the decimal over a power of ten (0.625 = 625/1000) then simplify to 5/8.

What are the rounding rules?

Look at the next digit. If it is 5 or more, round the previous digit up; otherwise leave it.

More Arithmetic & Number Sense calculators

Fraction CalculatorAdd, subtract, multiply, divide and simplify fractions and mixed numbers. Percentage CalculatorPercent-of, percent change, increase, decrease and reverse percentages. Ratio & Proportion CalculatorSimplify ratios, solve proportions and share amounts in a ratio. GCF and LCM CalculatorCommon factors and multiples using prime factorization. Prime FactorizationBreak any number into primes and test divisibility. Exponents & RootsPowers, square roots, cube roots, radicals and scientific notation.

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