Sum calculator adds every number in your list and reports the total, count, and mean.
About this calculator
Sum calculator adds every number in your list and reports the total, count, and mean. Paste a column from Excel, type comma-separated values, or enter space-separated numbers — the tool ignores blank entries and non-numeric text.
Summing is the first step in most statistics: mean, variance, and standard deviation all start with Σx. Checking the sum catches data-entry errors fast — if your monthly sales figures should total ₹5 lakh but the sum shows ₹4.2 lakh, something is missing from the paste.
For 10, 25, 30, 45, 50, 12, 8, 20 the sum is 200 across 8 values, so the mean is 25. Negative numbers work too: −5 + 10 + 3 = 8.
Use [[average]] or [[mean-median-mode]] for median and mode alongside the mean. For spread after summing, try [[variance]] or [[standard-deviation]].
Common uses
- Verify the total of a spreadsheet column before submitting a report
- Add homework scores quickly without a manual calculator
- Check whether daily expense entries sum to the expected monthly budget
- Sum sensor readings before computing an average in a lab notebook
- Total invoice line items to cross-check against a printed bill
Frequently asked questions
What is the sum of 10, 25, 30, 45, 50, 12, 8, and 20?
10 + 25 + 30 + 45 + 50 + 12 + 8 + 20 = 200. With 8 values, the mean is 200 ÷ 8 = 25.
Can I paste numbers from Excel or Google Sheets?
Yes. Copy a column and paste it directly. Commas, spaces, and newlines all work as separators. Non-numeric cells are skipped.
Does the sum calculator handle negative numbers?
Yes. −10 + 25 + 5 = 20. Negative values subtract from the running total just as they would on paper.
What is the difference between sum and mean?
Sum is the total of all values. Mean is sum divided by count — the average per item. This calculator shows both.