Gemsmakers · Antique Dealer Tools
Antique Booth Profit and Return on Investment Calculator
This planner separates the cash you must commit to opening a booth from the expenses that repeat every month. It then estimates operating profit at three sales levels so you can decide whether the booth fits your target return and available working capital.
Calculator
Enter your figures below. Results update from the assumptions you supply; check your agreement, fee schedule, and local requirements before making a decision.
How to use this tool
- Enter one-time setup costs and the initial inventory investment separately. Together they form the starting capital invested.
- Enter monthly rent and operating costs, plus the estimated cost of goods sold and selling-fee percentages.
- Enter expected monthly sales. The calculator models conservative sales at 70%, expected sales at 100%, and optimistic sales at 130%.
- Compare monthly profit, annualized ROI, and the simple payback estimate. Negative profit has no finite payback period.
Calculation method
Monthly operating profit = sales × (1 − cost-of-goods rate − selling-fee rate) − fixed monthly costs. Annualized ROI = (monthly operating profit × 12 ÷ starting capital) × 100. Simple payback = starting capital ÷ positive monthly operating profit.
Worked example
Illustration: if setup plus initial stock totals 4,000 and expected monthly operating profit is 400, simple payback is 10 months and annualized ROI is 120%. This assumes the monthly performance repeats and does not model financing or income taxes.
Important assumptions and limitations
- ROI shown here is an operating estimate, not a guarantee or a full accounting return.
- Inventory investment is treated as initial capital while cost of goods sold is modeled separately as a percentage of revenue; use a consistent accounting approach to avoid double-counting.
- A fast payback under an optimistic scenario should not replace a conservative cash-flow plan.
Frequently asked questions
What counts as setup cost?
Include fixtures, signage, transport, display materials, initial cleaning, and other one-time opening costs.
Why does payback show unavailable?
If monthly operating profit is zero or negative, the entered model does not recover the initial capital through operating profit.
Should I include unsold inventory in investment?
Yes, include the cash tied up in initial inventory as capital committed to the booth.
Is annualized ROI a forecast?
It is a simple annualization of one month’s modeled operating profit. Real sales, seasonality, additional investment, and resale of fixtures can change results.
How should I compare scenarios?
Check whether the conservative case remains affordable, not only whether the optimistic case looks attractive.
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