Addition Calculator — Sum of Numbers
Add a list of numbers instantly. Enter numbers separated by commas or one per line to get the sum, count, and average. Useful for adding long columns of numbers quickly. See also our Average Calculator and Percentage Calculator.
How to Add a List of Numbers
- Enter your numbers separated by commas or one per line in the text box.
- Click Calculate to get the sum instantly.
- View the total sum, count of numbers, and average.
- Edit or add more numbers and recalculate as needed.
Formula
Sum = a₁ + a₂ + a₃ + ... + aₙ
Count = n (total number of values)
Average = Sum / CountExample
Numbers: 12, 45, 78, 23, 56, 91, 34
Sum = 12 + 45 + 78 + 23 + 56 + 91 + 34 = 339
Count = 7
Average = 339 / 7 = 48.4286
Addition Reference Table
| Numbers | Sum | Count | Average |
|---|---|---|---|
| 1, 2, 3, 4, 5 | 15 | 5 | 3.00 |
| 10, 20, 30 | 60 | 3 | 20.00 |
| 100, 200, 300, 400 | 1000 | 4 | 250.00 |
| 5, 10, 15, 20, 25 | 75 | 5 | 15.00 |
| 50, 75, 100, 125 | 350 | 4 | 87.50 |
| 1000, 2000, 3000 | 6000 | 3 | 2000.00 |
Frequently Asked Questions
How many numbers can I add at once?
There is no practical limit. You can add hundreds or thousands of numbers at once by pasting them into the text box.
Can I use negative numbers?
Yes. Enter negative numbers with a minus sign (e.g., -5, 10, -3). The calculator handles positive and negative numbers correctly.
Can I use decimal numbers?
Yes. Enter decimal numbers like 3.14, 2.718, etc. The sum will be calculated with full decimal precision.
What is the difference between sum and average?
The sum is the total of all numbers added together. The average (arithmetic mean) is the sum divided by the count of numbers.
How do I separate numbers?
Use commas, spaces, or new lines to separate numbers. The calculator recognizes all common separators.