Sum Calculator
Add multiple numbers and find their total with this free online Sum Calculator. Enter your values to calculate the sum quickly and accurately. Use it for everyday arithmetic, budgeting, schoolwork, expense tracking, or checking totals in lists of numbers.
3 numbers added · average 20.
What is Sum Calculator?
Add a list of numbers and calculate the total with the free Sum Calculator. Enter your values to find their sum for everyday arithmetic, budgeting, school assignments, expense tracking and data analysis. Use the result to check totals quickly without adding each value manually. Review your entries to make sure the calculation includes all the intended numbers.
Why use this tool?
- Paste numbers separated by commas, spaces, semicolons or new lines, including a column copied from a spreadsheet.
- See the total, how many numbers were added and their average at a glance.
- Entries that are not numbers are ignored and reported, so a typo does not silently change the total.
How to use Sum Calculator
- Step 1. Type or paste your numbers into the box, separated by commas, spaces, semicolons or new lines.
- Step 2. Read the sum shown beneath the box, along with the count and average.
- Step 3. If the tool reports ignored entries, fix them in the list and the total updates immediately.
Common use cases
Important notes
- Commas separate numbers here, so type 1000 instead of 1,000. The tool warns when a value looks like it uses a thousands separator.
- Negative numbers and decimals are supported. Results are shown with up to ten decimal places.
- Floating-point arithmetic can add tiny errors, such as 0.1 + 0.2, so the tool rounds results to 12 significant digits.
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Sum Calculator FAQ
How do I add numbers separated by commas?
Paste them into the box. For example, 10, 20, 30 gives a sum of 60.
Can I paste a column from Excel or Google Sheets?
Yes. A copied column is separated by new lines, which the tool reads as separate numbers.
Why does 1,000 give the wrong total?
Commas separate numbers in this tool, so 1,000 is read as 1 and 000. Enter 1000 without the separator.
What happens to entries that are not numbers?
They are ignored and the tool shows how many were skipped, so you can find and fix them.