Retainer Utilization Calculator
Track how much of a time-based retainer has been used and estimate any overage beyond the included hours.
Formula: Utilization = used hours / included hours. Overage = max(used - included, 0) x overage rate.
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Calculated result
Retainer utilization
82.50%
16.50 of 20.00 included hours used
Implied included-hour rate
$150.00
Retainer fee divided by included hours
Hours remaining
3.50
Before any included hours expire or roll over
Estimated overage
$0.00
0.00 overage hours x $175.00
Formula: Utilization = used hours / included hours. Overage = max(used - included, 0) x overage rate.
Use the result correctly
What the calculation means
A retainer may reserve access rather than purchase a strict bank of hours. Use the calculation only when it matches the agreement, including rollover, expiration, response time, and overage approval rules.
Useful for
- Prepare a monthly retainer usage report
- Check remaining included capacity
- Calculate an approved hourly overage before invoicing
Frequently asked questions
Does unused retainer time roll over?
Only if the agreement says it does. Some retainers reserve availability and expire each period; others create a bank of hours.
Should overages be invoiced automatically?
Follow the agreement and approval threshold. Many providers notify the client before exceeding included hours.
Is the implied hourly rate the value of every retainer hour?
It is a simple ratio. Retainers can also price availability, priority, continuity, and reserved capacity, so the commercial value may not be purely hourly.
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