I kept seeing “rent out your car” advice that stopped at the daily rate — so I built the subtraction
I did not set out to “launch a SaaS.”
I kept running into the same thread pattern: someone asks if they should rent their car out, and the answers jump straight to a daily rate or a screenshot of a busy calendar. Host share gets treated like profit. Loan, insurance, cleaning, and depreciation somehow never make the highlight reel.
That bothered me as a planning problem. So I built a small static site that does the boring subtraction in the browser.
The model (deliberately simple)
Host revenue ≈ daily rate × booked days × host share %
True profit ≈ host revenue − monthly fixed − (trips × per-trip variable)
US published host shares on Turo (trips booked on/after Jan 7, 2026) land around 70 / 80 / 90 depending on the earnings plan. The calculator defaults to 80% (“Balanced”) so people can change it. Nine markets also vary with booking lead time — the tool is a planner, not a payout engine.
Defaults I shipped on purpose
$60/day, 50% occupancy, $500/month fixed, $25 per trip, 80% share, 30-day month.
That works out to about $720 host-side vs about $625 in those default costs — basically break-even until you type your real car payment. I wanted the first run to feel slightly disappointing. If the happy path needs 80% occupancy and a miracle market, people should see that before they take listing photos.
What else is on the site
Free HTML pages for the questions that show up right after the money math: eligibility (age / miles / title / NY-MD notes), earnings-plan plain language, first-car sequence, claims timing, lockbox/pickup notes, a few incidental fee explainers. Sourced from published help articles, dated, and labeled “if this page and the platform disagree, believe the platform.”
Process notes (the unglamorous part)
• Shipped static on purpose — no accounts, no “start free trial to see your profit.”
• Spent more time on fee footnotes and eligibility caveats than on growth loops.
• Rebranded away from an earlier prototype name so the public site matches how people actually search (“rent my car out”), not an internal codename.
• Amazon Associates tag exists on gear pages; I do not promise affiliate income and I do not lead community posts with affiliate links.
• Optional $19 kit (spreadsheet + 24 guest messages + 14-day checklist) sits behind the free calculator for people who want a workbook. I do not make anyone buy it to run the numbers.
Lessons so far
- “Host share %” is the most common confusion. Teaching the difference between guest total, host revenue, and true profit is the product.
- Conservative defaults convert better than fantasy defaults for trust — even if the screenshot is less sexy.
- Search demand is “can I rent my car out” / “how much will I take home,” not “Turo host operating system.”
- Communities that live this problem (host forums, side-hustle threads) punish storefront energy. The calculator has to stand alone as the useful object.
- Fee schedules move. Shipping dated sources and a “trust the receipt” line is cheaper than pretending you are the system of record.
I am not posting a fake “I made $X hosting” story. I built a planning tool. If you are about to list a personal car, put your real payment in the fixed box before you buy a lockbox.
Free calculator: https://rentmycarout.com
Happy to hear what is confusing, what fee edge-case I should add next, or how you would stress-test the model.
This is unusually principled, and lesson 2 is you discovering the actual product without quite naming it: the honesty isn't a trust tactic, it's the category. Every "should I rent my car out" tool is built to say yes, daily rate, busy calendar, host share as if it were profit. Yours is the only one built to credibly say no, or not yet, or only if. You didn't build a Turo earnings calculator, you built a bad-idea filter, and that's a different and more defensible thing, because the person who wants to be talked out of a mistake is underserved and the person looking for confirmation has a hundred options.
Which means your headline is currently in your footer. "Put your real payment in the fixed box before you buy a lockbox" is the whole positioning, and it's the last line. Lead with it. Not "calculate your profit" but "find out if this is a mistake before you spend a dollar on it." The conservative default that makes the first run disappointing isn't a UX compromise you're apologizing for, it's the product's entire reason to be trusted over every screenshot-of-a-busy-calendar tool.
On the stress-test you asked for, here's the real blind spot: your model treats cost as fixed-plus-per-trip, but the largest true cost of car rental is accelerated depreciation, and it's neither. Personal-car depreciation is time-based and roughly linear. Rental depreciation is mileage-and-abuse-based, strangers put hard miles on a car nobody owns, so the real cost is per-booked-mile, and it scales with occupancy. That's the nasty part: your model gets least accurate exactly for the high-occupancy hosts who look most profitable, because their worst-case cost grows with their best-case revenue, and it's the line your current math either buries in "fixed" or omits. The honest tool has one dishonest corner, and it's hiding in the success case.
Would a per-booked-mile depreciation input, defaulted ugly, change who your calculator tells to walk away? Because if the break-even flips for the 80%-occupancy fantasy case specifically, that's the most honest number on the whole site, and right now it's the one that isn't there.
This is the sharpest read I’ve gotten — thank you. You’re right that “credibly say no / not yet” is the product, and that the lockbox line is doing the positioning work from the wrong end of the page. I’ll pull that forward.
On depreciation: yes — burying mileage-and-abuse cost in a flat fixed line is the dishonest corner in the “success” case. A per-booked-mile depreciation input (defaulted ugly) is the next stress-test I want on the calculator, specifically because high occupancy is where the model looks most optimistic today. If that flips break-even for the fantasy occupancy case, that’s the most honest number on the site.
Both moves are right. Just make sure the depreciation number is visible in the default run, not tucked in an advanced input — the whole point is that the fantasy case has to see it without opting in. The honest number only works if it's unavoidable. Looking forward to the version where 80% occupancy stops looking free.
The conservative defaults are a strong trust choice. Do users actually change their decision about listing the car after seeing true profit, or mainly use the calculator to estimate what they might earn?
Quick add — honest answer on your question: I don’t have clean conversion data yet. Anecdotally the useful outcome is a walk-away or “not with this car/payment.” People who only want a bigger daily-rate number bounce. If it mostly becomes an earnings estimator and never changes a list decision, I’d treat that as a miss on the real job.
Appreciate that — conservative defaults were deliberate. Happy to hear what still feels thin or confusing once you’ve poked at the numbers.
That walk-away signal is much more interesting than an earnings estimate. I’d be curious to see how that develops. If you’re open to it, what’s the best email to reach you on?
Happy to keep chewing on walk-away metrics. Best email: jarrodredden@gmail.com — or keep it on this thread if that’s easier.
Thanks! I’ve just sent it over.
Looking forward to hearing your thoughts whenever you have a chance.