Working hours calculator
Working hours are working days times the length of a working day. A month of 21 working days at 8 hours is 168 hours; at 7.5 hours it is 157.5. The day length matters more than people expect over a year.
How to calculate working hours
Half an hour a day is 130 hours a year; over three working weeks. That is why the difference between a 7.5 and an 8 hour standard day is a real contractual matter rather than a rounding, and why lunch breaks being paid or unpaid changes an annual figure substantially. For billing, the number that matters is billable hours rather than working hours, and the ratio between them is rarely above 60%.
Questions
About 168 at 8 hours a day over 21 working days, or 157.5 at 7.5 hours.
Around 2,080 at 8 hours before holidays, or roughly 1,950 after them.
Considerably: about 130 hours a year, which is over three working weeks.
No. Billable time is usually well under 60% of working hours once admin and sales are counted.
That depends on your standard day. Set the field to paid hours only.