Use the formula `=part/total`
Format the result cell as Percentage
To find a percentage of a number, use `=number*percentage`
To calculate percentage increase, use `=(new-old)/old`
To calculate percentage decrease, use `=(old-new)/old`
To get a value from a percentage, use `=total*percentage`
To divide by a percentage, use `=number/percentage`
To copy the formula to other cells, drag the fill handle
Use absolute references like `$A$1` when needed
Use `=ROUND(formula,2)` to round the percentage result