Sum Calculator
Fast and forgiving addition. Just paste your messy data, numbers, or accounting lines—we'll ignore the text and give you the exact sum, count, and average.
Last updated: March 3, 2026
Delimiters
You don't need to put a plus sign (+) between everything. Commas, spaces, and even new lines all work perfectly to separate your numbers.
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Understanding Summation
Summing numbers is one of the most basic and frequent operations in data analysis, statistics, and everyday life. Here's a brief look at the notation and related concepts.
Sigma Notation (Σ)
In textbooks and research papers, you'll rarely see a long string of numbers with plus signs. Instead, mathematicians use the Greek letter Sigma (Σ) to represent the sum of all elements in a set. The notation includes a starting index at the bottom and an ending index at the top.
Arithmetic Mean
The sum is the vital first step for finding the "average" of a dataset. By taking the total sum and dividing it by the exact count of items you added together, you get the Arithmetic Mean, which represents the typical, or central, value of your data.
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