Free Retainer vs Hourly Invoice Calculator
Use this calculator when you are deciding whether to invoice a client by the hour or offer a monthly retainer instead.
Why this page exists
Compare an hourly billing total against a fixed monthly retainer to see which invoice amount makes more sense.
Built for real invoice workflows
If you settle on the retainer, InvoiceAgent can schedule the invoice automatically every month.
Hourly total
$2,400.00
Retainer
$2,500.00
Difference
$100.00
How to use it
Enter your hourly rate and expected hours for the month.
Add the retainer amount you are considering.
Compare the hourly total, the retainer amount, and the difference between them.
Why it helps
Useful for consultants and agencies shaping recurring client offers.
Makes pricing conversations easier before the invoice is drafted.
Helps you spot whether a retainer meaningfully covers expected effort.
From free tool to live invoice workflow.
Once your numbers and dates look right, InvoiceAgent can create the scheduled invoice, generate the PDF, send reminder emails, and dispatch it with live FX conversion at send time.