OneTaskArithmetic Calculators
Fraction, Ratio, Rounding, Significant Figures, Modulo, Exponent, Root and Logarithm Calculators
Calculators for the core operations of arithmetic: adding and dividing fractions, simplifying and splitting ratios, rounding by any rule, counting significant figures, finding remainders, and working with powers, roots and logarithms.
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Every Arithmetic tool
Decimal To Fraction Calculator
Decimals to simplified fractions, recurring decimals and inch fractions included.
Exponent Calculator
Raise a number to any power, with exact results for big powers.
UpdatedFraction Calculator
Add, subtract, multiply and divide fractions, with the working shown.
NewFraction To Decimal Calculator
Fractions and mixed numbers to decimals, repeating digits marked.
Log Calculator
Logarithms in base 10, e, 2 or any base, and antilogs.
NewLong Division Calculator
Long division with every step shown, remainders or decimals.
NewLong Multiplication Calculator
Column multiplication with every row and the final sum shown.
NewMixed Number Calculator
Add, subtract, multiply and divide mixed numbers with steps.
Modulo Calculator
Find a mod n for huge or negative numbers in every convention.
NewMultiplication Chart
Multiplication grid for any range of numbers, up to 30 by 30.
NewPercent To Fraction Calculator
Percentages to simplified fractions and decimals, with working.
NewPercentage Change Calculator
Percentage change from old to new, with working and average rate.
UpdatedRatio Calculator
Simplify a ratio, split an amount in it, or scale it up.
Root Calculator
Square, cube and nth roots, with the radical simplified.
Rounding Calculator
Round to decimal places or the nearest 10, with five rounding rules.
Significant Figures Calculator
Count significant figures and round to any number of them.
NewTimes Tables Practice
Timed times tables quiz that re-asks the facts you miss.
Rules that change the answer
Several of these operations have more than one convention. Rounding 2.5 gives 3 under half up and 2 under half to even, and -17 mod 5 is 3 in Python but -2 in JavaScript. Where that happens the calculator shows every version side by side, so you can match the rule your class, spreadsheet or programming language uses.
Fractions, ratios and powers
The fraction calculator works with mixed numbers and decimals and shows the cross-multiplication, the ratio calculator splits a total or scales a recipe, and the exponent, root and log tools cover powers in both directions. Whole-number powers stay exact, and roots are simplified to surd form where they can be.
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