Billable Hours Calculator
Quick answer: Your required billable rate = income target ÷ (billable hours per week × working weeks per year × utilization). At $120,000 ÷ (30 × 48 × 0.75), you need $111.11 per billable hour — because only 1,080 of your hours are actually billable.
Not every hour you work can be billed. Enter your target annual income, the hours you can bill each week, your working weeks per year, and your utilization rate, and this billable hours calculator returns your annual billable hours and the hourly rate you must charge to hit your target.
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Your results
Estimate. The rate is before income tax and business expenses.
How to use this calculator
Enter the income you want to earn in a year, how many hours per week you can realistically bill, how many weeks you work after time off, and what share of your working hours is billable. The required rate updates instantly.
If the rate looks shocking, that is the point: non-billable admin, unpaid weeks off, and low utilization all push the required rate up. Change one input at a time to see which lever moves the number most.
How this is calculated
Annual billable hours = billable hours per week × working weeks per year × (utilization ÷ 100). Required hourly rate = target annual income ÷ annual billable hours.
Input definitions: target annual income is the gross amount you want to earn before tax and expenses; working weeks is 52 minus vacations, holidays, and sick time; utilization is billable hours ÷ total hours worked, as a percentage. Assumptions: your billable capacity is the same every week; no allowance is made for uncollected invoices, gaps between clients, or rate changes during the year.
Worked example
$120,000 income target, 30 billable hours per week, 48 working weeks, 75% utilization. Annual billable hours = 30 × 48 × 0.75 = 1,080 hours. Required rate = 120,000 ÷ 1,080 = $111.11/hr.
Reference data
| Utilization | Billable hours/yr | Required rate |
|---|---|---|
| 100% | 1,440 | $83.33/hr |
| 75% | 1,080 | $111.11/hr |
| 60% | 864 | $138.89/hr |
| 50% | 720 | $166.67/hr |
Source: computed with this page's formula — an illustration of how much utilization moves the rate, not a publisher table.
Method & sources
Method: pure arithmetic — income target divided by billable capacity, where billable capacity is the product of weekly hours, working weeks, and utilization. The utilization convention (billable ÷ total hours) is the standard definition used in consulting and professional-services firms. No external data table is consumed.
- Utilization definition: billable hours ÷ total hours worked — standard professional-services usage.
Frequently asked questions
What is utilization?
Utilization is billable hours divided by total hours worked. Thirty billable hours out of forty total hours is 75 percent. Admin, marketing, and training hours are not billable.
How do I pick a utilization percentage?
Track one week honestly, or enter your best estimate and adjust later. The calculator only uses the number you enter — it does not assume one for you.
Does this include taxes and business expenses?
No. The rate is before income tax and before business expenses. Add your expected tax bill and overhead on top when you plan your actual take-home pay.
Why do working weeks matter?
A year has 52 weeks minus vacations, holidays, and sick time. Entering 48 working weeks instead of 52 raises your required rate — unpaid time off has to be paid for by your billable hours.