# Calculating With Formulae

All formulae begin with an equals sign. The formulae can contain numbers, text, arithmetic operators, logic operators, or functions.

Remember that the basic arithmetic operators (+, -, *, /) can be used in formulae using the "Multiplication and Division before Addition and Subtraction" rule. Instead of writing =SUM(A1:B1) you can write =A1+B1.

Parentheses can also be used. The result of the formula =(1+2)*3 produces a different result than =1+2*3.

Here are a few examples of LibreOffice Calc formulae:

=A1+10 |
Displays the contents of cell A1 plus 10. |

=A1*16% |
Displays 16% of the contents of A1. |

=A1 * A2 |
Displays the result of the multiplication of A1 and A2. |

=ROUND(A1;1) |
Displays the contents of cell A1 rounded to one decimal place. |

=EFFECTIVE(5%;12) |
Calculates the effective interest for 5% annual nominal interest with 12 payments a year. |

=B8-SUM(B10:B14) |
Calculates B8 minus the sum of the cells B10 to B14. |

=SUM(B8;SUM(B10:B14)) |
Calculates the sum of cells B10 to B14 and adds the value to B8. |

It is also possible to nest functions in formulae, as shown in the example. You can also nest functions within functions. The Function Wizard assists you with nested functions.