Calculate Sum of Integers

Negative integers are added correctly using standard mathematical rules. For example, adding 10 + (-5) gives 5, and adding -10 + (-20) gives -30. The tool handles mixed positive and negative integers without any extra steps.

The average (arithmetic mean) is calculated by dividing the sum by the count of integers. It’s displayed with 2 decimal places for precision. For example, summing [10, 20, 30] gives sum 60 and average 20.00.

Yes, the tool supports integers up to JavaScript’s MAX_SAFE_INTEGER (9,007,199,254,740,991). If the sum exceeds this limit, results may lose precision.

If you enter only one integer (e.g., 42), the sum is that integer (42) and the average is also that integer (42.00).

Zeros are included in the calculation. For example, adding [10, 0, -10] gives sum 0 and average 0.00.

Absolutely. All processing happens entirely in your browser using client-side JavaScript. Your integers are never uploaded to any server, ensuring complete privacy and security.

Yes, this integer adder is completely free with no registration, hidden fees, or usage limits. Use it as often as you need.

Yes, the tool can efficiently sum lists of 100,000+ integers in under 70ms, all client-side in your browser.

You can separate integers with newlines (one per line), commas, or semicolons. The tool also accepts integers with comma formatting (like 1,234) and strips the commas before calculation.

Once the page is loaded, the tool works entirely offline since all processing happens in your browser. No internet connection is required for adding integers.