Back-Office ROI Calculator: What Your Admin Work Really Costs
Most back-office ROI calculators are built to give you a big number. Put in a few hours, get back a five-figure saving, then see a form asking for your phone number. The number is usually wrong in the same two places, and the fix takes about ten minutes with a pencil.
We built a free back-office ROI calculator of our own, so we have a stake in this. But the math under it is not complicated, and you should be able to check it by hand. Here is how the calculation works, which inputs people get wrong, three worked examples (one of which says do not buy), and what the number does and does not tell you.
The formula, in plain steps
Five steps. Nothing here needs a spreadsheet.
1. Hours a month. Take the hours a week that back-office work eats, then multiply by 52 and divide by 12. Ten hours a week is about 43 hours a month, not 40, because months are a little longer than four weeks. Invoicing, follow-ups, scheduling, data entry and admin email all count.
2. Share that can be automated. Not all of it can. Repetitive work with clear rules goes well. Anything that needs judgment or a relationship does not. Our calculator defaults to 75 percent and gives 60 to 85 percent as the usual range for repetitive work. If your admin time is mostly judgment calls, use less.
3. Hourly cost. Multiply the saved hours by what an hour of that person's time costs you. More on this in a moment, because it is the input people get most wrong.
4. Subtract the monthly cost. Whatever you pay each month for the service. That is your monthly net saving.
5. Payback. Divide the one-time setup fee by the monthly net saving. That is how many months until the setup has paid for itself. If the monthly net saving is zero or below, there is no payback and the answer is no.
The two inputs people get wrong
First, the hourly cost. Owners tend to plug in what they pay an employee, or nothing at all because their own time is not on a payroll. Neither is right. For an employee, use the loaded cost: wages plus the taxes and benefits you pay on top. The Bureau of Labor Statistics found that in June 2026, private-industry employers paid an average of $46.89 per hour worked in total compensation, of which $32.82 was wages and salaries (70.0 percent) and $14.07 was benefits (30.0 percent). So a $25 wage is closer to $36 an hour once you load it. The averages vary a lot by industry, so treat the 30 percent as a starting point, not a rule.
For the owner's own time, count what the hour would earn if you were doing the thing only you can do: selling, quoting, doing billable work. That is why we say $80 to $150 for owners and $35 to $60 for office staff. It is a judgment, not a measurement, and it is worth being honest with yourself about it.
Second, whether the saved hours go anywhere. A saved hour is only money if something happens with it. If you are the owner and the freed hours become two extra quotes a week, that is real. If a salaried employee is paid the same whether they spend Friday afternoon chasing invoices or not, the saving stays on paper until their time moves to something that earns, or until you stop adding headcount you would have needed. A calculator cannot see that, and neither can we from a form. You can.
Three worked examples
These use the same formula our calculator runs: hours a month times the share automated times the hourly cost, minus the monthly plan fee. Plan fees and setup fees are the ones on our pricing page. These are illustrations of the arithmetic, not customer results.
The office that is drowning. Ten hours a week of admin, at a loaded $60 an hour, 75 percent automated, on the $297 a month AI Admin Assistant plan ($497 one-time setup). Ten hours a week is 43.3 hours a month; 75 percent of that is 32.5 hours; at $60 that is $1,950 a month. Minus $297 leaves about $1,653 a month. The $497 setup pays back in under a month. Plenty of room for the estimate to be wrong and still come out ahead.
The owner who does their own books. Five hours a week, an owner's time at $100 an hour, 60 percent automated, same plan. That is 21.7 hours a month, 13 of them saved, worth $1,300. Minus $297 leaves about $1,003 a month, and the setup pays back in roughly half a month. This one only holds if those 13 hours go to billable work or selling. If they go nowhere, it is a wash.
The one that does not pay. Three hours a week, office help at a loaded $35 an hour, 60 percent automated. That is 13 hours a month, 7.8 of them saved, worth about $273. The plan costs $297. The net is minus $24 a month, so there is no payback at all. At that volume, do not buy. Fix the three worst tasks yourself, or wait until the work grows.
That third case matters. A calculator that cannot say no is a sales form with a slider on it.
What the number does not tell you
It does not include the cost of getting started: a few hours of your time describing how the work is done today, which you will spend whichever vendor you pick. It does not capture errors and late payments, which are real costs but hard to count honestly. And it assumes the automation is actually run and watched. Our plans are done-for-you, so we run it, but the hours-saved figure is still an estimate until you see the first two months. Most clients save 10+ hours a week within the first two months; your number depends on what the work actually is.
Our calculator also has an optional section showing what monthly savings could grow to if invested. Treat that one as illustration only; it ignores taxes and inflation and is not financial advice. The part that matters is the first two lines: monthly net saving and payback.
How to use the result
If payback is under a year and the hours really will be redeployed, the math supports buying. Between one and two years, think hard about whether the work will grow. Over two years, wait. When the net is positive, the next question is which plan: the AI Admin Assistant at $297 a month runs one to three jobs, the AI Office Manager at $697 wires invoicing, scheduling and follow-up together, and the AI Back Office at $1,497 is for businesses with a lot of moving parts. Start with the smallest plan that covers your top three time sinks. The AI helper directory shows what each job looks like.
This is probably not a fit if…
Your admin work is under about four hours a week. At that size the arithmetic rarely clears even the entry plan, as the third example shows.
Most of your admin time is judgment. Negotiating with suppliers, handling difficult customers and deciding who to hire do not automate. Use a lower share, or none.
You will not redeploy the hours. If nothing will change when the work disappears, you are buying peace of mind, which is fine, but do not call it ROI.
You want a guaranteed number. We do not promise one and neither should anyone selling you this. The calculator is a sanity check, not a forecast.
If none of those apply, run your own numbers in the free calculator, no sign-up needed, and then book a free 30-minute call. We will tell you whether the result holds up and what we would automate first. If it does not, we will say that too.
Ready to see the plans side by side? AI plans start at $297 a month with a $497 one-time setup, month-to-month.