Count working days and the hours of capacity they represent.
Weekend days are derived from the number of whole weeks in the span, then public holidays and booked leave are subtracted. Multiplying by hours per day converts the result into the capacity figure used for planning. Project plans quoted in calendar days overstate available capacity by roughly 30% before holidays are even considered.
Working Days
Working days = calendar days − weekend days − public holidays − leave
Working days = calendar days − weekend days − public holidays − leave Weekend days are derived from the number of whole weeks in the span, then public holidays and booked leave are subtracted. Multiplying by hours per day converts the result into the capacity figure used for planning.
Project plans quoted in calendar days overstate available capacity by roughly 30% before holidays are even considered.
This calculator takes 5 inputs: Calendar days in the period, Non-working days per week, Public holidays falling on a working day, Annual leave taken in the period, Working hours per day. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.