Gross; simplified year.
Rough monthly gross ≈ hourly × weekly_hours × (52 weeks ÷ 12 months), i.e. annualize from weekly hours then divide by 12. Real months differ; this is a common back-of-envelope estimate.
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.