Manual vs AI-Assisted Content: The Real Monthly Cost for a 5-Client Agency

"AI saves time" is easy to say and hard to prove for your own agency. The only number that matters is what your team spends per month producing content for your actual clients, before and after. That depends on your hours, your rates and how much review AI drafts need for your brands.

This article gives you a worksheet to work that out. It is vendor-neutral, and it deliberately includes the costs that AI drafting does not remove.

How to use this worksheet

1. Copy the tables into a spreadsheet.
2. Replace every number marked (illustrative) with your own. The sample figures exist only to show how the maths works; they are not benchmarks or typical values.
3. Time a real week of work if you do not know your hours. Estimates from memory tend to undercount small tasks like resizing images and chasing approvals.
4. Run the manual column first, then the AI-assisted column, then compare.

The example agency throughout is a 5-client shop where each client gets around 12 social posts and 2 emails per month. Change that to match your own scope.

Step 1: Define monthly volume

Item	Per client per month	Clients	Total per month
Social posts	12 (illustrative)	5	60
Emails / newsletters	2 (illustrative)	5	10
Monthly content plan	1	5	5
Monthly client report	1	5	5

Keep the volume the same in both columns. You are comparing two ways of producing the same output, not a bigger output.

Step 2: Break production into tasks

The mistake most cost comparisons make is treating "writing a post" as one task. It is several, and AI drafting affects them very differently.

Task	Affected by AI drafting?	Notes
Research and idea generation	Partly	AI can suggest angles; someone still checks relevance
Re-reading brand guidelines / context	Depends on the tool	Generic tools need re-briefing each time; brand-trained ones need less
First draft	Yes	The main time saving
Editing for voice and accuracy	Increases at first	Review is where AI drafts cost time
Fact and claim checking	No	Still fully human
Design / visuals	Not covered here	Treat separately unless your tool does it
Client approval rounds	Indirectly	Better drafts can mean fewer rounds
Scheduling	Depends on tool	Separate from drafting

Step 3: Manual cost per month

Fill in minutes per item for your team working without AI drafting.

Task	Minutes per post (illustrative)	Posts per month	Hours per month
Research and ideas	10	60	10.0
Brand context refresh	5	60	5.0
First draft	20	60	20.0
Edit and polish	10	60	10.0
Fact check	5	60	5.0
Revisions after client feedback	10	60	10.0
Social subtotal			60.0

Task	Minutes per email (illustrative)	Emails per month	Hours per month
Plan and draft	90	10	15.0
Edit, check, revisions	45	10	7.5
Email subtotal			22.5

Add planning and reporting:

Task	Hours per client (illustrative)	Clients	Hours per month
Monthly content plan	2	5	10.0
Monthly report	1.5	5	7.5

Manual total hours (illustrative): 60 + 22.5 + 10 + 7.5 = 100 hours per month.

Now apply your loaded hourly rate. Use what the hour actually costs you (salary plus overheads divided by productive hours), not what you bill.

Manual hours per month:           100   (illustrative)
x Loaded cost per hour:           $25   (illustrative)
= Labour cost:                    $2,500
+ Tool costs (scheduler, design): $____
= Manual monthly cost:            $____

Step 4: AI-assisted cost per month

This is where honesty matters. AI drafting shortens the first draft, but it shifts time into review. An AI draft that is mostly right still needs a person who knows the brand to find and fix the parts that are not. For the first month or two with a new tool, review time often goes up, not down, while your team learns what to check.

Fill this in with your own measured times after a trial period, not with a vendor's claims.

Task	Minutes per post (illustrative)	Posts per month	Hours per month
Research and ideas	7	60	7.0
Brand context refresh / re-briefing the tool	2	60	2.0
Generate and choose draft	5	60	5.0
Review and edit for voice and accuracy	15	60	15.0
Fact check	5	60	5.0
Revisions after client feedback	8	60	8.0
Social subtotal			42.0

Notice what changed in the illustrative row values and what did not:

• First draft dropped, because the tool writes it.
• Review and edit went up from 10 to 15 minutes, because someone now has to check machine output carefully.
• Fact check did not change. AI drafts can state things confidently that are wrong, so this step cannot be skipped.
• Brand context refresh only drops if the tool remembers each client's brand. With a generic AI chat tool, re-pasting the brief every session can keep this close to the manual figure. Put your own number in.

Repeat for emails, planning and reports with your own times:

Area	Manual hours (illustrative)	AI-assisted hours (illustrative)
Social posts	60.0	42.0
Emails	22.5	16.0
Content plans	10.0	7.5
Reports	7.5	6.0
Total	100.0	71.5

Then add tool costs. List every tool, not only the AI one.

AI-assisted hours per month:      71.5   (illustrative)
x Loaded cost per hour:           $25    (illustrative)
= Labour cost:                    $1,787.50
+ AI drafting tool:               $____
+ Scheduler (if separate):        $____
+ Design tool:                    $____
+ Extra seats needed:             $____
= AI-assisted monthly cost:       $____

For reference, published monthly prices in this category range widely. As one real data point, Impret lists Pro at $39 per month and Agency at $99 per month on its public pricing. Check current pricing for any tool you are considering, and include per-seat or per-brand charges, which can change the total for a 5-client agency.

Step 5: Add the one-off costs

AI-assisted drafting has setup costs that a monthly comparison hides. Put them in once, then spread them across the first few months.

One-off cost	Hours (illustrative)	Notes
Building brand profiles / voice briefs per client	2 per client = 10	Needed for good output from any AI tool
Testing and calibrating output	6	Comparing drafts against approved past posts
Training the team on review standards	4	What to check, what not to trust
Total one-off	20

At the illustrative $25 per hour, that is $500 once. Spread across three months, add roughly $167 per month to the AI-assisted column during that period.

Step 6: Compare honestly

                          Manual      AI-assisted
Monthly hours             ____        ____
Labour cost               $____       $____
Tool costs                $____       $____
One-off (spread)          $0          $____
Total monthly cost        $____       $____

Difference per month:     $____
Hours freed per month:    ____

Then ask the questions the spreadsheet does not answer:

• What happens to the freed hours? If they go into taking on a sixth client or better strategy work, the saving is real. If they disappear into meetings, it is not.
• Did quality hold? Track client revision requests per post for a month in both modes. If revisions go up, the review-time figure is too low.
• Who is doing the review? If AI drafting moves work from a junior writer to a senior reviewer, the hourly rate on review time is higher. Use different rates per task if that applies.
• Is the client comfortable? Some clients have views on AI-drafted content. Agree your approach with them before you change process.

Where AI drafting usually does not save money

Be realistic about cases where the worksheet may come out even or negative:

• Clients with heavy regulatory or legal review, where human checking dominates the time anyway
• Very low-volume clients, where setup costs never pay back
• Content that depends on original interviews, photography or expertise the tool does not have
• Teams without a clear brand brief per client, since output quality and review time both suffer

A note on measuring

Do not trust your first week's numbers in either direction. Run the AI-assisted process for at least one full monthly cycle, timing tasks with a simple timer or time-tracking tool, before you decide. Measure the same clients in both modes if you can, because brand complexity varies more between clients than most people expect.

Next step

To get a real number for the "generate and choose draft" row, paste one client's website into the Impret website demo, time how long it takes to review the three drafts it returns, and put that figure into your worksheet.