Column Addition Calculator

Work out column addition instantly with clear inputs, formula shown and shareable results.

About Column Addition Calculator

Column addition lines the numbers up by place value and adds each column from the right, carrying any excess into the next column. The number of digits in the widest term tells you how many columns you need.

Formula

Column addition

total = Σ of all terms, adding units, then tens, then hundreds, carrying as needed

Worked example

With the default values below, Column Addition Calculator returns Total of 3,590.000000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Numbers to add (comma or space separated): 487, 2965, 38
Additional number to include: 100

Results

Total: 3,590.000000
Numbers added: 4
Digits in the widest number: 4
Mean of the numbers: 897.500000

Step by step

1Values used
2Column addition
3Total= 3,590.000000
4Numbers added= 4
5Digits in the widest number= 4
6Mean of the numbers= 897.500000

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 6 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

487 + 2965 + 38 + 100?

3590. The units column gives 7+5+8+0 = 20, so 0 with 2 carried.

Why align to the right?

Because place value is anchored at the units digit; aligning left would add tens to units.