Facebook Marketplace ROI calculator
Use your numbers.
See what would need to happen.
Adjust lead volume, appointment rates, and gross per sale to model a scenario for your dealership. The calculation stays in your browser.
Your assumptions
A scenario, not a sales promise.
The starting inputs are editable examples. Replace them with your store's actual numbers before using the result.
150
Marketplace leads / mo
38
Appointments / mo
10.1
Modeled sales / mo
$28,350
Modeled total gross / mo
Modeled sales minus your baseline: 5.1 added sales/month. Added gross: $14,350. Entered monthly costs: $1,432, including $33 of allocated setup cost.
$12,918
Added gross after entered costs
9.0x
Modeled return on entered costs
0.51
Added sales to cover entered costs
How the model works
Model the funnel. Subtract your baseline and costs.
No hidden weighting is added. A change to any input changes the result.
Estimated units
Leads × appointment rate × show rate × close rate.
Estimated gross
Estimated units × average gross per unit.
Added gross after entered costs
Subtract baseline sales from modeled sales, multiply the difference by gross per sale, then subtract software, allocated setup fees, and other entered costs. This is a scenario, not measured uplift or total business net profit.
Put the process to work
Give your team a useful starting point.
Get free buyer replies, appointment confirmations, and handoff checklists to use alongside your scenario.
Your questions
Questions about the calculation.
How does this Facebook Marketplace ROI calculator work?
Monthly leads multiplied by appointment, show, and close rates gives modeled sales. The calculator subtracts your baseline sales to estimate added sales, then subtracts software, allocated setup, and other entered costs from the added gross. The result is a scenario, not measured uplift or total business net profit.
Where do the starting numbers come from?
Lead volume, conversion rates, five baseline sales, and gross per sale are editable illustrations, not customer averages. The $1,399 monthly cost and $399 setup cost reflect the published five-rep Marketplace plus AI plan. Replace the inputs with comparable periods from your dealership.
What baseline should I enter?
Use monthly sales from the same lead source, rep group, and attribution window before the proposed change. Avoid counting the same delivery in several channels. Seasonality, inventory, price changes, and staffing can affect the comparison.
How are setup fees and other costs handled?
Setup is spread over the number of months you enter for scenario comparison. Enter one month to include the full setup fee in the first month. Add labor, advertising, or other incremental costs separately. This allocation does not change when your actual fee is due.
Is the calculator free and private?
Yes. It runs in your browser without signup. The numbers entered in this calculator are not submitted to QUANTUM.
Less busywork. More time selling.
Put the workflow next to the numbers.
See how posting, buyer replies, and appointment booking could fit the way your dealership works.