Billable Hours Calculator
Calculate project invoices from hours and rates, measure your utilization rate, or project annual revenue. Works with any currency — built for freelancers, consultants, and agencies.
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How to Use This Calculator
Tab "Project Total"
Add line items for each task in your project: enter a description, the number of hours, and your hourly rate. You can add up to 8 line items. Then add any additional expenses (software, materials, travel). The calculator totals your invoice: sum of all (hours × rate) plus expenses.
Tab "Utilization Rate"
Enter your total work hours per week (including admin, meetings, marketing) and your billable hours per week (time you can charge to clients). The result shows your utilization rate as a percentage, with a benchmark: 60–80% is healthy, below 50% means too much admin.
Tab "Effective vs Billable"
Enter your billable rate, utilization rate (from Tab 2 or your own estimate), total hours per week, and work weeks per year (default 48). The calculator shows your effective hourly rate (what you actually earn per total hour worked) and your projected annual revenue.
The Formulas
Invoice = Σ(Hours × Rate for each task) + Expenses
Utilization rate:
Utilization = Billable Hours / Total Work Hours × 100%
Effective hourly rate:
Effective Rate = Billable Rate × Utilization Rate
Annual revenue:
Revenue = Billable Rate × Billable Hours per Week × Work Weeks per Year
Billable hours per week:
Billable Hours = Total Hours per Week × Utilization Rate
All calculations are universal and pre-tax. No country-specific tax rates are applied. Results are estimates.
Worked Examples
Example 1 — Consulting project invoice: 3 tasks + expenses
A consultant bills three tasks on a project: research, writing, and review. They also have $350 in expenses for software and travel.
The total invoice is $5,550 for 24 billable hours of work plus expenses. The average effective rate across all tasks is $216.67/hr.
Example 2 — Agency utilization: 45-hour work week
An agency employee works 45 hours per week total, of which 30 hours are billable to clients. The remaining 15 hours are spent on internal meetings, admin, and business development.
At 66.7%, this is within the healthy range. The employee has enough non-billable time for admin and growth, while still maintaining strong client-facing output.
Example 3 — Freelancer revenue projection: $200/hr at 65% utilization
A freelancer charges $200/hr, works 45 hours per week, has a 65% utilization rate, and works 48 weeks per year.
While billing at $200/hr, the freelancer effectively earns $130 for every hour worked (including non-billable time). The projected annual revenue of $280,800 is before taxes and business expenses.
Understanding Billable Hours
What Are Billable Hours?
Billable hours are the hours you spend working directly on client projects that you can charge for. They exclude admin tasks, marketing, invoicing, professional development, and other overhead. For freelancers and agencies, tracking billable vs non-billable hours is essential for understanding true profitability.
Why Utilization Rate Matters
Your utilization rate reveals how much of your working time generates revenue. A low rate (below 50%) means you are spending more time on admin than client work — either you need to streamline operations or raise your rates to compensate. A very high rate (above 80%) suggests you have no time for business development, learning, or rest.
Billable Rate vs Effective Rate
Your billable rate is what the client sees on the invoice. Your effective rate is what you actually earn per hour of total work. If you charge $200/hr but spend 35% of your time on non-billable tasks, your effective rate is only $130/hr. Understanding this gap helps you set rates that reflect your true cost of doing business.
Tips for Improving Utilization
Batch admin tasks into dedicated time blocks. Use templates for proposals, contracts, and invoices. Automate recurring tasks like time tracking and billing. Consider raising rates instead of trying to bill more hours — working at 90%+ utilization is unsustainable. Aim for 65–75% and set your rate accordingly.