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Excel SUM Function Guide

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Basic Usage: Excel SUM function adds values using syntax: SUM(number1, [number2], ...)
AutoSum feature automatically inserts SUM formula when selecting range
SUM can add values from different ranges or cell references
Column and Row Summing: Column summing uses range reference (e.g. =SUM(B2:B8))
Whole column summing uses range reference without bounds (e.g. =SUM(B:B))
Row summing uses range reference (e.g. =SUM(B2:D2))
Total Row feature automatically sums data in Excel tables
Advanced Features: SUBTOTAL function (109) sums only visible cells
Running total uses absolute and relative references
SUMIF and SUMIFS functions enable conditional summing
3-D references allow summing across multiple sheets
Common Issues: #Name error indicates misspelled SUM function
Text-formatted numbers prevent SUM calculations
Circular references cause SUM to return 0
Manual calculation mode prevents formula updates