Retainer pricing calculator for agencies

The calculator prices the retainer from cost up, then back-solves for margin. It runs five steps:

1. Base labor cost = monthly hours committed x average cost per hour.
2. Scope buffer = base labor cost x buffer %.
3. Management overhead = base labor cost x management %. Both percentages apply to base labor cost, not to each other.
4. Total monthly cost = base labor cost + scope buffer + management overhead.
5. Retainer price = total monthly cost / (1 - target margin). The effective hourly rate is that price divided by the committed hours.

Annual revenue is the monthly price x 12. Annual margin is annual revenue minus 12 months of total cost. Results are rounded to the nearest dollar, and the hourly rate to the cent.

What each input means

The defaults are starting assumptions for the example below, not industry benchmarks. Replace them with your own numbers.

For example, a content agency commits 40 hours a month to a client. The writers and editor on the account cost a blended $85 an hour. The agency adds a 15% scope buffer, 10% for account management and wants a 50% margin.

• Monthly retainer price is the lowest price that hits your margin target if the client uses the committed hours plus the buffer. Quote at or above it.
• Effective hourly rate is the price divided by committed hours only. Compare it with your standard hourly rate. If it is lower, the retainer is a discount, whether you meant it to be or not.
• Total monthly cost is what delivery costs you. It is the number to watch after signing: if logged hours run past committed hours plus the buffer, cost rises and margin falls.
• Annual margin is the dollar profit over 12 months at your cost basis. Use it to compare one large retainer against several smaller ones.

The margin you need depends on what your hourly cost already covers. Pick one basis and use it for every retainer so prices stay comparable.

• Delivery cost only. Salary or contractor rate, payroll taxes and benefits, divided by productive hours. For example, a $70,000 salary plus 25% for taxes and benefits is $87,500. Spread over 1,400 billable hours a year, that is $62.50 an hour. On this basis the margin must also pay for rent, software, sales time, owner time and profit.
• Fully loaded cost. Delivery cost plus a share of overhead. Here the margin is closer to profit, so a lower target can still be healthy.

The employee cost calculator works out an hourly cost per person, and the agency overhead calculator shows how much overhead each hour has to carry. For context on profit, Promethean Research's 2026 Digital Agency Industry Report puts the average agency net margin at 13% in 2025, after all expenses.

How the margin target changes the price

Same 40-hour retainer, same $4,250 monthly cost:

Each 10 points of margin adds more to the price than the last, because you divide by a smaller number.

A common mistake is adding the margin percentage on top of cost. Marking up $4,250 by 50% gives $6,375. The margin on that price is $2,125 / $6,375, or 33.3%, not 50%. To keep 50% of the price, divide cost by 0.5 and charge $8,500. The markup vs margin calculator converts between the two.

• Commitment discounts. Some agencies discount retainers in exchange for a longer term. A 10% discount on $8,500 is $7,650, and the margin drops from 50% to 44.4%. Raise the margin target first if you plan to discount.
• Rollover. Unused hours that roll over are cost you still owe. If 10 hours roll into the next month, the client can use 50 hours for the same $8,500. At the example rates that month costs $5,313 and the margin falls to 37.5%. Cap rollover or let hours expire at the end of each period.
• Overage. Bill hours beyond the committed amount at no less than the effective hourly rate ($212.50 in the example). Overage hours cost the same to deliver as committed ones.

Write these terms into the retainer agreement before the first invoice.

• Legal or advance-payment retainers. A deposit held against future hourly billing is not a monthly service fee. This tool does not model it.
• Output-based retainers. If you sell a fixed number of deliverables (say, eight blog posts a month) and do not track hours, estimate hours per deliverable first. Without that, the result is a guess.
• Pass-through costs. Ad spend, software licences and freelancer invoices you rebill are not in the formula. Price them separately or add them to cost per hour.
• Hours you cannot staff. The math assumes the hours exist. Check team capacity with the utilization rate calculator before you commit them.

The price is only right while actual hours stay close to the plan. Compare logged hours with committed hours every month and reprice or rescope at renewal if the buffer is being used up.

In AgencyPro, fixed-fee recurring services are on every plan. Hours-based and credit-based retainers, with optional rollover, need Pro ($79/mo). Pro also includes time tracking, so a timesheet filtered by client shows hours used against hours included before the month closes. Plus ($149/mo) adds profitability reports by client and service. See retainer billing for periods, rollover and renewals.