Short Term Rental Calculator: The Numbers You Need to Run Before You List

"It basically pays for itself."

That's what a lot of STR hosts say before they actually look at the numbers. They saw the projected revenue from an Airbnb calculator, backed into a mortgage payment, and assumed the gap was profit. It rarely is.

Short term rentals can be excellent businesses. They can also be expensive hobbies that masquerade as income. The difference usually comes down to whether you ran the full math before you committed — or just the top line.

Here's what a real short term rental calculator needs to show you.

Start With Realistic Revenue, Not Best-Case Revenue

Most online STR calculators pull from platforms like AirDNA or Rabbu and spit out a projected annual revenue number. That number is usually based on comparable listings in your market. It's a starting point, not a guarantee.

Two inputs matter more than anything else on the revenue side:

Average Daily Rate (ADR): What you charge per night. Comps will tell you what similar properties charge, but your rate is influenced by how well your listing is presented, your review count, your amenities, and how aggressively you manage pricing. New listings without reviews typically need to price 15–25% below market to build momentum.

Occupancy rate: How many nights you're actually booked. The national average for U.S. short term rentals sat at approximately 54.9% in 2025 (AirDNA). That means a typical property is empty almost half the year. In competitive or seasonal markets, that figure can swing dramatically — from 35% in a shoulder-season coastal market to 75%+ in a year-round urban one.

Multiply these two: ADR × annual available nights × occupancy rate = gross revenue.

That's what you actually collect before expenses. Everything else comes out of it.

The Expense Side That Kills the Math

This is where STR analysis gets honest. Short term rentals carry a fundamentally different cost structure than long-term rentals, and most calculators either skip these or bundle them into a vague "operating expense" percentage that doesn't hold up to scrutiny.

Platform fees: Airbnb charges hosts a service fee of approximately 3% on most reservations. VRBO and direct booking channels have different structures. If you're on multiple platforms, your effective blended fee rate matters.

Cleaning and turnover: This is the line item that surprises people most. A full-service cleaning between every guest in a 2-bedroom property typically runs $75–$150 per turn, depending on your market and whether you use professional cleaners or pay someone you know. At 55% occupancy on a property that averages 3-night stays, you're looking at 60+ turns per year — potentially $6,000–$9,000 annually in cleaning costs alone.

Supplies and restocking: Toiletries, paper products, coffee, kitchen basics. Budget $20–$50 per booking depending on your hospitality level and guest count.

Property management: If you self-manage, this is your time — which isn't free, but doesn't hit your bank account directly. If you hire a manager, expect 20–30% of gross revenue for full-service management. That number is not a typo.

Utilities: Unlike long-term rentals, you're almost always paying utilities on an STR — electricity, water, internet, streaming services. Budget $200–$400/month depending on property size and climate.

Maintenance and repairs: The rule of thumb is 1% of property value annually. Short term rentals see more wear than owner-occupied homes due to guest volume. Some operators budget 1.5%.

STR insurance: Standard homeowner policies don't cover short term rentals. You'll need either a dedicated STR policy or a platform protection plan supplement. Expect $150–$300/month more than you'd pay for standard coverage.

Property taxes: These don't change based on whether you're renting to guests or tenants, but they're a real line item that often gets overlooked when people calculate their "profit" against a mortgage payment.

The Number That Tells You If the Deal Works

Once you have realistic revenue and real expenses, you can calculate break-even occupancy — the minimum percentage of nights you need booked just to cover your costs. This is the number that actually tells you whether an STR is viable.

Here's the formula:

Break-even occupancy = Total monthly fixed and variable costs ÷ (ADR × days available per month)

If your all-in monthly costs are $4,200 and you're charging $175/night, you need to book at least 24 nights per month to break even — that's 80% occupancy. In most markets, that's not achievable year-round without an exceptional listing, relentless pricing management, and a lot of reviews.

This is why the same property in two different markets can be a great business in one and a money loser in the other.

For STR investments to make financial sense, most operators target:

• Gross yield above 10%: Annual gross revenue ÷ property value
• Cash-on-cash return of 8–12%: Net cash flow ÷ total cash invested (down payment + setup costs + furnishings)
• Break-even occupancy below 50%: Leaves enough cushion to be profitable in slow seasons

As of late 2025, AirDNA data shows the STR premium over long-term rental income averages about $989/month in top markets — but that's gross, not net. After all the above expenses, many operators find that premium compresses significantly, especially in higher-cost markets with heavy management overhead.

When STR Math Works and When It Doesn't

Short term rentals tend to make financial sense when:

• Your market has strong year-round demand (not just summer peaks)
• You can self-manage, or your ADR is high enough to absorb management fees
• Your break-even occupancy is well below your market's average
• You're buying at a price where 10%+ gross yield is achievable

They tend not to work when:

• You're relying on projected revenue from an online tool without stress-testing occupancy
• You're in a market with 35–45% average occupancy and seasonal swings
• All-in costs (mortgage, insurance, property tax, STR expenses) require 70%+ occupancy to break even
• Local regulations are tightening and your license situation is uncertain

The only way to know which category your property falls into is to run the actual numbers — all of them, not just the ones that make the deal look good.

Run Your STR Numbers Before You Commit

KnowYourNut's Short Term Rental Calculator is built to show both sides: realistic revenue based on your market inputs, and the full expense picture including cleaning, platform fees, management, and maintenance. You'll see your break-even occupancy, monthly cash flow, and whether the numbers actually work.

Run your short term rental analysis at KnowYourNut — no signup required.

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*This content is for informational purposes only and does not constitute financial advice. Short term rental profitability varies significantly by market, property type, and operational decisions. Consult a licensed financial or real estate professional before making investment decisions.*