## Standard Deviation Modes

Location: Program Preferences Window

The F12 key cycles through the four standard deviation modes:

For H2O with molecular weight 18.01528 and std. dev. of 0.0003159114,

- Short mode displays the result as 18.0153(3)
- Scientific mode displays it as 18.0153 (3.159114E-04)
- Decimal mode displays it as 18.01528 (.0003), std. dev. not rounded
- Off mode displays it as 18.01528, without standard deviation or rounding.

The standard deviation (accuracy) of calculated molecular weights and percent compositions is calculated according to mathematical formulas.

Back to the Molecular Weight Calculator download page