How to project annual billable hours
Start from a normal week and subtract time off.
1
Enter the working week
Use contracted or realistic weekly hours.
2
Set billable hours
Count only hours that can be invoiced to clients.
3
Adjust for leave
Subtract holiday and leave weeks to reach a realistic annual figure.
What does this tool do?
Annual billable hours depend on the working week, billable share and time off. This calculator annualizes a weekly pattern and shows the utilization rate and non-billable time that sit behind the figure.
The Formula
Annual billable hours = Weekly billable hours × (Weeks per year − Weeks off)Frequently Asked Questions
Why are annual billable hours lower than weekly hours times 52?
Time off, public holidays, admin work and sales activity are not billable. The calculator uses working weeks minus leave and the billable share of each week.
What is a healthy billable utilization?
Many services firms plan around 60% to 75% for delivery staff. Roles with sales, management or training duties typically carry lower billable targets.