Hourly wage × hours per week × (52÷12)—approximate gross monthly before tax.
Monthly = hourly × hours per week × (52 ÷ 12); annual = hourly × hours per week × 52—same hours every week, no unpaid weeks modeled.
This calculator uses plain decimal numbers. If a result looks wrong, check whether you used a comma instead of a dot (or vice versa) where the field expects one.