Number list sum calculator
Add a complete list of finite numbers, with compensated summation to reduce loss from cancellation. Processing takes place locally in your browser.
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Number list sum calculator
Use the page’s decimal notation; separate values with spaces, semicolons or newlines. Signed decimals and scientific notation are accepted. Text, fractions, non-finite numbers and nonzero inputs rounded to zero are rejected. There is no preview of recognized values.
Limits: 100000 characters and 10000 values. Addition starts at zero in input order, retaining a correction to reduce cancellation errors. For 1e16;1;-1e16, the result is 1. This uses JavaScript Number, so parsed inputs can already be rounded and compensation does not guarantee an exact decimal total. Intermediate overflow rejects the calculation even if later terms could bring the exact total back into range. Display rounds to at most 15 significant digits without grouping. No weights, column grouping, steps or download.
Processing takes place locally in your browser.