Long Addition Calculator
Add two or more whole numbers the way it's taught on paper — column by column from the ones place, showing every carry.
Inputs explained
- Numbers to add (comma-separated whole numbers) — Two or more non-negative whole numbers separated by commas, e.g. 345, 678.
How to use it
- Fill in the fields above — each input has a hint describing exactly what to enter
- Press Calculate to get your result instantly, right on this page
- Copy the result, save the tool to favorites, or share and embed it anywhere
Understanding the result
Example: 345 + 678 = 1023: the ones column gives 5 + 8 = 13, so you write 3 and carry 1.
Frequently asked questions
Can I add more than two numbers at once? Yes, you can enter any number of comma-separated values and the calculator will align and add them all in one column-by-column pass.
How does it handle numbers with different digit lengths? Shorter numbers are right-aligned with the others (effectively padded with leading zeros) so each column still adds the correct place values.
Is the Long Addition Calculator free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.
Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.
What information do I need? Just the following: Numbers to add (comma-separated whole numbers). Each field includes a hint explaining exactly what to enter.
Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.
Privacy
Everything you enter into the Long Addition Calculator is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.