Addition Calculator. Enter two or more numbers into the Addition Calculator and get the sum instantly. Input your values into Number 1, Number 2, and up to additional addend fields — the calculator returns the total sum along with a step-by-step breakdown and a visual chart of each number's contribution. Also try the calculate Extended Euclidean Algorithm.
Total Sum (A + B + ...)
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Number of Addends
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Average of Addends
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Largest Addend
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Smallest Addend
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An addend is any number being added together in a summation. For example, in the equation A + B = C, both A and B are addends and C is the resulting sum. This calculator supports up to five addends at once. See also our calculate Power of 2.
Addition is the mathematical operation or process of combining numbers together. The sum is the result of that operation — it's the total you get after performing the addition. For instance, 3 + 4 = 7, where 7 is the sum.
Yes. This calculator fully supports both whole numbers and decimal numbers. Simply enter values like 12.5 or 0.987 into any of the addend fields and the calculator will return a precise decimal sum.
Long addition is a method of adding numbers by stacking them vertically and aligning columns by place value (ones, tens, hundreds, etc.). You then add each column from right to left, carrying over any value greater than 9 to the next column. This calculator shows each addend's contribution in the step-by-step table. You might also find our Modulo Calculator useful.
Yes. This calculator lets you add up to five numbers at once using fields Number 1 through Number 5. Fields marked optional can be left blank if you only need to add two or three numbers.
The plus sign (+) was introduced by mathematicians in the 15th century, derived from the Latin word 'et' meaning 'and'. It became the universally recognised symbol for addition across all branches of mathematics and science.
The commutative property states that the order in which you add numbers does not affect the result: A + B = B + A. For example, 5 + 3 = 3 + 5 = 8. This is one of the fundamental properties of addition.
Addition combines numbers to produce a larger total (the sum), while subtraction finds the difference between numbers, typically resulting in a smaller value. Adding a negative number is equivalent to subtraction: A + (−B) = A − B.