Retainer Calculator
Set a monthly retainer from expected hours and hourly rate, with optional discount and overage pricing.
How is retainer calculator worked out?
A monthly retainer is the hours you commit to reserve multiplied by your hourly rate, usually with a discount in return for guaranteed income, and an overage rate charged for hours used beyond the included allowance.
Retainer Calculator
Monthly retainer
$1,710.00
- Effective hourly rate
- $85.50
- What you actually earn per included hour.
- Overage rate per extra hour
- $95.00
Show the working
| 20 hours at standard rate | $1,900.00 |
| Retainer discount at 10% | -$190.00 |
| Monthly retainer | $1,710.00 |
| Contract value over 12 months | $20,520.00 |
| Given up over the term | $2,280.00 |
The amount given up over the term is what you are paying for predictability. If it looks large, that is the point of showing it — it should be a decision, not a habit.
A retainer trades some of your rate for predictability. That trade is only worth making if the discount is deliberate and the overage rate is agreed in advance — otherwise a retainer becomes a fixed fee for an unbounded amount of work, which is the way most of them fail.
The formula
Standard value = included hours × hourly rate
Monthly retainer = standard value × (1 − retainer discount %)
Effective rate = monthly retainer ÷ included hours
Overage rate = hourly rate × overage multiplierPricing overage at or above your standard rate is deliberate: the discount was payment for a commitment, and hours beyond the commitment were never part of that bargain. Setting the overage rate below your standard rate gives clients a reason to systematically under-commit.
Decide what happens to unused hours before you sign
There are only three reasonable answers, and all of them are fine as long as they are written down: unused hours expire at month end, they roll forward for a limited period, or they are credited. Rollover is the most client-friendly and the most dangerous to you, because unused hours accumulate silently and then arrive all at once in a month when you have no capacity. If you do allow it, cap the balance and put an expiry on it.
Making scope visible every month
Retainer invoices look identical month after month, which is exactly why creeping scope goes unnoticed until renewal. Recording hours used against hours included on each invoice turns that into a monthly conversation held with numbers rather than an annual argument held with impressions. It also makes an overage invoice unsurprising when one is finally needed.
Retainers for availability rather than hours
Some retainers buy access rather than a quantity of work — priority response, a reserved slot, someone on call. Those are priced on what your availability is worth to the client and what it costs you to hold capacity open, not on an hour count, and they should say so explicitly. Mixing the two models in one agreement without saying which governs is how retainer disputes start.
Frequently asked questions
How do you calculate a monthly retainer?
Multiply the hours you will reserve each month by your standard hourly rate, then apply whatever discount you are offering in return for the commitment. Set an overage rate for hours used beyond the included allowance, usually at or above your standard rate.
How big should a retainer discount be?
Large enough that the client values the commitment and small enough that a full month of work still pays well. Ten to twenty percent is a common range. The figure worth watching is what the discount costs you across the whole term, which is why this calculator shows it.
What should I charge for hours beyond the retainer?
Your standard rate at minimum. The discount was consideration for a guaranteed commitment, and hours outside that commitment were not part of it. Charging less than your standard rate for overage rewards clients for committing to less than they need.
Put the number on an invoice
The free invoice generator builds the document around your figures — line items, tax, payment terms — and downloads a print-ready PDF. No signup required.
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