Sum Calculator
Add up a whole list of numbers and see the count and average too.
Sum
60
Adding all 5 values together.
Count
5
Average
12
How it works
Drop in as many numbers as you like, separated by commas, spaces, or new lines. The calculator adds them all together and shows the running total.
Alongside the sum you get two extras that usually come up in the same breath: how many numbers you entered, and their average — the sum divided by that count.
Everything recalculates the instant you edit the list, so you can tweak a value or paste a fresh set without pressing a button. Anything that isn't a number is quietly skipped.
Frequently asked questions
How should I separate the numbers?
Commas, spaces, and line breaks all work, and you can mix them. So 12, 8 20 and a stack of numbers one per line are read the same way.
Does it handle decimals and negatives?
Both are fine. Negative values subtract from the running total, and decimals are added at full precision, so a list like 4.5, -2, 10 sums to 12.5.
How is the average worked out?
It's the plain arithmetic mean — the sum divided by how many numbers you entered. If you paste five values totalling 60, the average shown is 12.