Client Retainer Calculator
Calculate total billed amount and effective hourly rate for a client retainer, including overage charges when actual hours exceed the included amount.
$
hrs
$
hrs
Total Billed This Month
$3,900.00
Overage Hours
6.0 hrs — $900.00
Effective Hourly Rate
$150.00/hr
How to Use the Client Retainer Calculator
Enter your monthly retainer fee, the number of hours included in that retainer, your overage hourly rate (charged for any hours beyond the included amount), and the actual hours used this month. If actual hours are at or below the included amount, you bill just the flat retainer fee. If actual hours exceed the included amount, the calculator adds overage charges for the extra hours on top of the retainer fee, and shows the effective hourly rate you actually earned for the month.
If Actual Hours > Included Hours: Total Billed = Retainer Fee + (Actual − Included) × Overage Rate
Effective Hourly Rate = Total Billed ÷ Actual Hours
Example
A $3,000.00/month retainer covering 20 hours, with a $150/hr overage rate, where the client used 26 hours this month: the 6 overage hours cost $900.00, bringing the total billed to $3,900.00 — an effective rate of $150.00/hr across all 26 hours actually worked.
Common Use Cases
- Billing a retainer client correctly when their usage exceeds the included hours in a given month.
- Tracking whether a retainer arrangement is still profitable as actual usage creeps up over time.
- Deciding whether to renegotiate a retainer's included hours or overage rate based on typical usage.
FAQs
- What happens if actual hours are less than the included hours? You still bill the full flat retainer fee — retainer arrangements typically don't refund or discount unused hours, since the fee is meant to secure ongoing availability and priority, not just pay for hours used.
- Why does the effective hourly rate matter? It shows what you're really earning per hour once actual usage is factored in. A retainer that looks generous on paper can have a low effective rate if actual hours used are consistently much higher than the included amount without matching overage charges.
- Should overage hours be billed at a higher rate than the retainer's implied hourly rate? Many freelancers and agencies do set overage rates higher than the retainer's baseline rate, since overage work is less predictable and harder to plan around than the committed retainer hours.