Just enter a simple expression in a numeric field starting with the equal sign

`=3*5+2`

Then enter or change focus to evaluate the expression.

`17`

It supports javascript syntax, for examples :

`=2*Math.PI*5`

`31.41593`

`=Math.log(1024)/Math.log(2)`

`10`

`=(function(r) { return 2*Math.PI*r; })(5)`

`31.41593`