Compare the work you have promised with the recurring revenue it will bring. Start with project time logs, licence invoices and retainer scopes. Each example below uses hypothetical values you can replace.
Which calculator should you use?
| Tool | What it answers | What to check |
|---|---|---|
| Retainer Delivery Hours Available | Set a delivery-hour envelope for a recurring client agreement. | A negative answer means other costs already exceed the chosen cost envelope. Fixed overhead is not included unless entered. |
| Service Plan Contribution | Check contribution from a recurring service package. | Treat uncertain upsells separately. First test whether the committed included service covers its own costs. |
These tools answer different questions and may use different units. Choose the tool that measures what you need; a larger result does not necessarily mean a better outcome.
Retainer Delivery Hours Available
Set a delivery-hour envelope for a recurring client agreement.
Available hours = (retainer × (1 − margin) − other delivery costs) / hourly cost
Show example inputs and result
| Monthly retainer fee | 3,000 |
|---|---|
| Non-labour monthly delivery cost | 300 |
| Target contribution margin | 40 % |
| Loaded delivery hourly cost | 45 |
Result: 33.3333 hours per month.
A negative answer means other costs already exceed the chosen cost envelope. Fixed overhead is not included unless entered.
Open retainer delivery hours availableService Plan Contribution
Check contribution from a recurring service package.
Annual contribution = plan fee − visits × visit cost − admin cost
Show example inputs and result
| Annual plan price | 360 |
|---|---|
| Included visits per year | 2 |
| Variable cost per included visit | 90 |
| Annual member admin cost | 20 |
Result: 160 per member per year.
Treat uncertain upsells separately. First test whether the committed included service covers its own costs.
Open service plan contributionUse the results in your plan
For a cybersecurity consulting business, review assessment hours, tooling, and reporting across the complete workflow. Use one consistent period and delivery unit: a engagement. Compare the assumptions with recorded outcomes after delivery, then update the estimate.
Explore all relevant cybersecurity consulting calculators