You bought a lens for $2,000. You have rented it out 40 times over two years. You have a rough sense that it has been "worth it." But has it? How close is it to paying for itself? Is it outperforming or underperforming the other equipment in your inventory?
These are the questions that rental ROI answers. And for equipment rental owners, ROI is not an abstract financial concept. It is the single most important number for every buy, hold, or sell decision you make.
What rental ROI means
ROI stands for return on investment. In the context of equipment rental, it measures how much of your equipment's purchase cost you have earned back through rental income.
The formula is:
ROI = (Total Net Earnings / Purchase Cost) x 100
If you bought a camera body for $4,000 and it has earned $2,800 in net rental income, your ROI is 70%. You have earned back 70% of what you paid. At 100%, the equipment has fully paid for itself. Every dollar earned beyond that is pure profit on the original investment.
This is often called "payback percentage" in the rental context, because the question equipment owners care about is not "what is my annualized return" but "has this thing paid for itself yet, and if not, how close is it?"
Both framings use the same math. The difference is mindset. Traditional ROI is an investor metric. Payback percentage is an operator metric. For rental equipment owners, the operator framing is more useful because it directly informs the decisions you face: keep or sell, buy more or hold off, raise the price or leave it.
Why this is the most important metric
Revenue is the number most owners track. But revenue tells you what came in, not whether the investment was worthwhile.
Consider two items: a $1,200 lens that has earned $900 net over 18 months (75% ROI), and a $6,000 camera body that has earned $2,400 net over the same period (40% ROI).
The camera earned more total revenue. But the lens is much closer to paying for itself and will become pure profit within months. The camera, at its current rate, will not break even for another two and a half years, by which point depreciation may have eroded much of its remaining value.
Revenue alone makes the camera look like the better investment. ROI reveals that the lens is the smarter one. This distinction matters every time you decide what to buy, keep, or sell.
Step-by-step calculation with a real example
Let us work through a complete calculation for a common rental item.
The equipment
Item: Canon RF 24-70mm f/2.8L IS USM
Purchase cost: $2,299
Purchased: January 2024
The rental history (over 24 months)
You have rented this lens 40 times over two years on Sharegrid. Here is what the numbers look like across those 40 rentals:
- Total gross booking revenue (what renters were charged): $4,800
- Total Sharegrid service fees (15%): -$540
- Total multi-day discounts applied: -$720
- Total promotional discounts: -$180
- Total net earnings (what landed in your account): $3,360
The ROI calculation
ROI = $3,360 / $2,299 = 146.1%
This lens has not just paid for itself. It has earned back 146% of its purchase cost, meaning $1,061 in pure profit beyond the original investment.
The supporting metrics
Average net payout per rental: $3,360 / 40 = $84 per rental.
Average rentals per month: 40 / 24 = 1.67 rentals per month.
Monthly net earnings rate: $84 x 1.67 = $140 per month.
Time to payback: $2,299 / $140 = 16.4 months. This lens paid for itself in roughly 16 and a half months.
These supporting metrics help you understand the earning pattern. An item with high ROI from one lucky long-term rental is different from one with consistent monthly bookings. This lens, with steady per-rental earnings, is a proven performer.
Why net earnings, not gross
The most common mistake in calculating rental ROI is using the gross booking amount instead of the net payout. This matters more than most people realize.
In the example above, the gross revenue was $4,800. The net was $3,360. That is a 30% gap. If you calculated ROI using gross numbers, you would get 208% instead of 146%. You did not receive $4,800. You received $3,360.
On Sharegrid, the gap between gross and net widens as booking duration increases. A detailed breakdown of Sharegrid's fees and actual payouts shows that multi-day rentals can lose 40% to 50% between the listed rate and the actual payout. Always calculate ROI against the amount that landed in your account.
Factoring in depreciation for true ROI
Basic ROI tells you whether the item has earned back its purchase price. But equipment does not hold its value. A camera body purchased two years ago for $4,000 might be worth $2,800 today. A lens purchased for $2,299 might be worth $2,000. This value decline is real and should factor into your assessment.
Depreciation-adjusted ROI
To account for depreciation, adjust the formula:
Adjusted ROI = (Net Earnings + Current Market Value - Purchase Cost) / Purchase Cost x 100
Using the Canon RF 24-70mm example:
- Net earnings: $3,360
- Estimated current market value (after 2 years): $1,950
- Purchase cost: $2,299
Adjusted ROI = ($3,360 + $1,950 - $2,299) / $2,299 = 131.0%
The depreciation-adjusted ROI is lower than the basic ROI because the lens has lost about $349 in market value. But it is still well above 100%, confirming that this was a strong investment even accounting for depreciation.
Why depreciation matters more for camera bodies
Lenses depreciate slowly, typically 3% to 5% per year. Camera bodies depreciate much faster, losing 15% to 25% in the first year and continuing to decline as newer models release. For a deeper look at how different gear types lose value, see the analysis of camera lens depreciation rates.
A camera body with 80% basic ROI might drop to 50% adjusted ROI once you account for the market value decline. That changes the picture significantly. The item has not actually earned back as much of its true economic cost as the basic number suggests.
For lenses, the adjustment is smaller. For camera bodies and other fast-depreciating items, it is essential.
Common mistakes in calculating rental ROI
Not accounting for all fees
Sharegrid's 15% service fee is the obvious one. But multi-day discounts, promotional credits, and shoot-day conversions all reduce your actual payout. Many owners pull the gross booking amount from their Sharegrid dashboard and use that as earnings. This overstates ROI by 30% to 50% on longer rentals. If you want to calculate whether your camera kit has paid for itself, you need the actual net numbers.
Ignoring maintenance costs
A camera body that needs a $200 sensor cleaning every six months has real ongoing costs. Lens calibration, body servicing, and replacing worn accessories all reduce your net return. Track your annual maintenance costs per item and subtract them from net earnings before calculating ROI.
Using purchase cost when you should use cost basis
If you bought a camera body for $4,000 and later spent $500 on a cage, handle, and SSD that go out with it as part of the rental package, your true cost basis is $4,500, not $4,000. ROI should be calculated against the total capital invested in the rentable package, including essential accessories that make the item rentable.
Calculating ROI at the portfolio level only
Total portfolio ROI is useful as a summary number, but it hides the variation between your best and worst performers. If your total portfolio ROI is 85%, that might mean every item is at roughly 85%, or it might mean half your items are at 150% and the other half are at 20%. The item-level breakdown is where the actionable insights are.
What good rental ROI looks like
Benchmarks depend on the equipment category, your market, and how long you have owned the item.
After one year
Strong: 50% or higher. The item is on track to pay for itself within two years, which is excellent for rental equipment. At this pace, you will be earning pure profit before significant depreciation occurs.
Average: 25% to 50%. The item is generating income but is not on an aggressive payback path. It will take two to four years to break even, which is acceptable for slow-depreciating items like lenses but risky for camera bodies.
Concerning: Below 25%. At this earning rate, the item may never reach payback before depreciation and obsolescence erode most of its value. Evaluate whether a pricing adjustment, better listing, or market change could improve performance.
After two years
Strong: 100% or higher. The item has paid for itself. Everything from here is profit. This is the goal for any rental equipment purchase.
Average: 60% to 100%. Getting close to payback. The item is a reasonable investment but not a standout. Continue renting and it will reach 100% eventually.
Concerning: Below 60%. After two years, less than 60% payback means the item is earning slowly relative to its cost. Consider whether the remaining capital would generate better returns in different equipment.
How long payback takes by equipment type
Different types of gear follow different payback timelines based on their cost, daily rate, demand, and depreciation profile.
Camera bodies ($3,000 to $6,000 range)
Typical payback: 18 to 30 months. Mid-range bodies like the Sony FX3 or Blackmagic Pocket 6K Pro rent consistently at moderate purchase costs. The risk factor is depreciation: camera bodies lose value faster than any other equipment type. A body that has not reached payback by month 24 is racing against value decline.
High-end cinema cameras ($15,000+)
Typical payback: 24 to 48 months. Premium daily rates but lower booking frequency and significant depreciation when successors launch. A single model replacement announcement can drop market value by 20% to 30% overnight.
Lenses ($1,000 to $3,000 range)
Typical payback: 12 to 24 months. Popular zooms and fast primes in common mounts rent frequently and hold value well. The combination of moderate cost, decent daily rate, and slow depreciation makes lenses the most reliable rental investment for most owners.
Lighting and audio ($500 to $3,000 range)
Typical payback: 12 to 24 months. LED panels, wireless microphone systems, and sound kits have moderate costs and consistent demand. Technology cycles vary, so some brands hold value better than others.
Automating the calculation
Doing this math manually for every item in your inventory is exactly the kind of work that does not get done. You calculate ROI for one or two items out of curiosity, intend to do the rest later, and never do.
This is the core problem that ROI analytics tools solve. Import your rental data, enter your purchase costs, and get per-item ROI calculated automatically from your actual transaction history. No formulas to build. No spreadsheet to maintain.
For a deeper walkthrough with additional worked examples, see the guide to calculating ROI on rental equipment with real examples. And for the question of whether your entire camera kit has reached payback, the kit payback calculator guide covers portfolio-level analysis.
The bottom line
Rental ROI is the ratio of what your equipment has earned to what it cost. It is the most important number for any rental equipment owner because it directly answers whether each purchase was a good investment.
Calculate it using net earnings, not gross. Account for depreciation on fast-declining items like camera bodies. Track it per item, not just as a portfolio average. And review it quarterly so you catch underperformers before depreciation makes the sell decision for you.
Every piece of equipment you own is either working toward paying for itself or slowly becoming a loss. ROI tells you which is which.
