Property Management Blog

Every short-term rental investment starts with the same question: will this property actually make money? The answer usually lives inside a revenue calculator, a tool that pulls occupancy, nightly rate, and booking data from active listings and turns it into a projection you can model against your purchase price, loan terms, and operating costs.

The problem is that not every calculator treats those numbers the same way. Some lean on broad market averages and stop at gross revenue. Others let you swap in your own assumptions for nightly rate, occupancy, expenses, and financing, which is where the real underwriting happens. The gap between those two approaches can mean the difference between a deal that pencils out on screen and one that actually cash-flows in practice.

The five tools below represent the range of what is available right now, from free no-signup estimators to full analytics platforms. We evaluated each one based on the dimensions that matter most when you are actually trying to underwrite a purchase: how much control you get over the inputs, how thoroughly expenses and financing are modeled, and whether the output gives you enough to make a confident decision.

Here’s a quick summary of what we found:

1. Chalet: Full Underwriting Flexibility on a Free Platform

Most STR calculators generate a number and ask you to trust it. Chalet takes a different approach. It generates a baseline from current comps, then hands you the controls.

You can override the average daily rate, set your own occupancy target, itemize every expense category (including management fees, cleaning, utilities, insurance, property taxes, and repairs) and plug in complete loan terms including interest rate, amortization, and debt service coverage ratio. Every adjustment recalculates cash flow, net operating income, cap rate, and cash-on-cash return instantly.

That level of control matters because market averages rarely describe any specific property. A well-managed listing with strong reviews and premium amenities will outperform the median in its zip code, and a calculator locked to averages will understate its potential. Chalet lets you replace those defaults with numbers pulled from an operator's actual books, or from your own conservative targets, so the projection reflects the deal you are actually evaluating rather than a statistical composite of every listing nearby.

The financing module is equally detailed. Rather than offering a single "mortgage payment" field, Chalet models loan amount, rate, term, and DSCR independently. At today's interest rates, many STR deals produce negative leveraged cash flow even when the underlying property is profitable on an unlevered basis, and Chalet is one of the few free tools that surfaces this clearly instead of burying it behind optimistic assumptions.

Beyond the calculator itself, the platform bundles market guides, local regulation dashboards, and a vetted directory of STR-focused real estate agents and lenders. These resources help connect running numbers to actually closing on a property. The entire platform is free with no subscription required. An account is needed only after several property lookups, and data refreshes monthly.

At a Glance

• Price: Free (no subscription or paywall)

• Data Sources: Airbnb listing comps, Zillow Zestimates, AI-driven modeling

• Customization Depth: Full. Override ADR, occupancy, every expense line, and complete financing terms (loan amount, rate, term, DSCR)

• Financial Metrics: Annual revenue, operating expenses, NOI, cap rate, cash-on-cash return, DSCR, leveraged cash flow

• Coverage: United States

2. Airbtics: Global Data With Scenario-Testing Built In

Airbtics positions itself as a global short-term rental analytics platform, and the calculator reflects that ambition. During setup it asks whether you plan to buy, rent, or manage the property, a small detail that adjusts the output to match your investment approach. Once you enter a location and bedroom count, the tool returns projected ADR, occupancy, and annual revenue, with editable fields so you can test different assumptions directly in the interface.

The free tier delivers a solid performance snapshot, while paid plans unlock historical trends, seasonality breakdowns, and submarket-level analysis including regulation scores, market grades, and active listing counts. The interface can feel slightly rough around the edges, with results sometimes requiring a page refresh before they load. Still, the breadth of metrics is broader than most competitors at this price point.

Where Airbtics loses ground is in expense modeling. Its operating cost assumptions often run lighter than what most owners actually incur once management fees, maintenance, and insurance are factored in. That means the NOI it displays can look reasonable on the surface even when revenue and cost inputs are both understated. It also tends to pull ADR estimates below what well-positioned, professionally managed properties actually command, which makes it more useful for scanning unfamiliar markets than for underwriting a specific deal. If you use Airbtics as a starting point and layer in your own expense and rate assumptions, it becomes much more useful.

At a Glance

• Price: From $29/mo (annual) to €109/mo (monthly)

• Data Sources: Proprietary global STR database

• Customization Depth: Moderate. Editable ADR, occupancy, and revenue fields. Expense inputs more limited.

• Financial Metrics: Annual revenue, ADR, occupancy, NOI, regulation scores, market grades

• Coverage: Global

3. BNB Calc: Quick Underwriting With a Few Blind Spots

BNB Calc is a newer platform that tries to shorten the path from property listing to financial analysis. You can paste a Zillow URL or MLS number and the tool auto-fills property details, which saves real time if you are evaluating multiple listings in a buying sprint. It pulls revenue projections from a blend of AirDNA and Airbtics data, then layers on expense estimates and, uniquely among the tools reviewed here, estimated tax deductions, giving you a rough sense of after-tax income.

It also includes a social media content generator tied to your property data, which is a niche perk for hosts who want to market their listing but is not a factor in the underwriting itself.

The area to watch carefully is financing. BNB Calc includes mortgage-related fields, but the way it categorizes debt service can be inconsistent, in some cases treating only property taxes under its "Mortgage & Taxes" line rather than modeling the full principal-and-interest payment. That can make leveraged returns look much better than they would be in practice, especially at today's interest rates where many STR deals produce thin or negative cash flow after debt service. Its revenue model can also run slightly above what operators report in practice, which compounds the issue. For a quick first-pass screen it is useful, but verify the financing output independently before relying on it for a purchase decision.

At a Glance

• Price: $15.75/mo (annual plan) to $30/mo

• Data Sources: AirDNA + Airbtics + other external feeds

• Customization Depth: Partial. Some expense and revenue inputs adjustable. Financing modeling inconsistent.

• Financial Metrics: Annual revenue, operating expenses, NOI, cap rate, cash-on-cash, estimated tax deductions

• Coverage: United States and select international markets

4. Rabbu: No-Account Free Snapshot for Early-Stage Research

Rabbu is the fastest path from curiosity to a number. No account, no signup, no paywall. Just type an address, confirm a few property details, and get a revenue estimate within seconds. That zero-friction experience makes it a natural first stop for investors who are scanning multiple markets before committing to deeper analysis.

The tradeoff is precision. Rabbu leans heavily on market-wide averages, which means its projections compress toward the middle of the comp set. Properties that perform near the median will be represented fairly well, but listings with strong reviews, premium amenities, or above-average management will look worse than they actually are. The tool also does not let you override ADR, occupancy, or expense assumptions, so there is no way to correct for that gap within the interface.

Rabbu does include basic financing assumptions, and it generally points in the right direction on whether a leveraged deal would be cash-flow positive or negative. But because the revenue baseline already skews conservative, the financing output tends to exaggerate downside risk, flagging deals as deeper in the red than they would actually be with realistic income assumptions. Think of Rabbu as a screening filter. If a property looks promising even under its conservative defaults, that is a strong signal to follow up on with a more granular calculator.

At a Glance

• Price: Free (no account required)

• Data Sources: Proprietary STR database of Airbnb listings

• Customization Depth: Minimal. No user-adjustable ADR, occupancy, or expense inputs.

• Financial Metrics: Gross revenue, occupancy, ADR, NOI, cap rate, basic financing estimate

• Coverage: United States only

5. AirDNA Rentalizer: Market-Level Intelligence With a Learning Curve

AirDNA is probably the most recognized name in short-term rental data, and its Rentalizer calculator benefits from that scale: over 10 million Airbnb and Vrbo listings feed the model, giving it one of the largest comp pools available. Paid subscribers unlock monthly revenue forecasts, amenity-based adjustments, comparable property sets, and seasonality visualizations that are hard to find elsewhere at this level of detail.

The free tier is more limited. It returns a baseline revenue estimate with occupancy and ADR, but the deeper benchmarking and customization features sit behind a $34–50 monthly subscription. For investors doing serious market research, the paid plan is where the real value lives, especially for comparing neighborhoods, understanding seasonal demand swings, and assessing how specific amenities affect nightly rate.

One pattern to watch is how AirDNA arrives at its revenue totals. The platform sometimes reaches a reasonable annual number through a mix of occupancy and ADR that differs meaningfully from what a given property actually experiences. For example, it might project higher occupancy paired with a lower nightly rate to land at approximately the same gross revenue.

The total might look accurate on the surface, but the underlying assumptions would point you toward a different pricing and availability strategy if taken at face value. Community feedback on forums like Reddit echoes a similar theme. AirDNA is widely trusted for spotting market trends and seasonality patterns, but individual property projections tend to skew optimistic and should be cross-referenced with actual booking data or an operator's own numbers.

At a Glance

• Price: $34–50/mo (free tier for basic estimates)

• Data Sources: 10M+ Airbnb and Vrbo listings worldwide

• Customization Depth: Moderate to high on paid plans. Adjustable projections, amenity filters, comp set selection.

• Financial Metrics: Annual revenue, ADR, occupancy, operating expenses, cap rate (no financing/mortgage modeling)

• Coverage: Global

Picking the Right Calculator for Your Situation

No single tool is perfect for every investor at every stage. The right choice depends on where you are in the process and what you need the numbers to do.

If you are scanning unfamiliar markets or want a quick temperature check on a zip code, Rabbu's no-account, no-cost model gets you a conservative baseline in seconds. For deeper market-level context, seasonality patterns, neighborhood comparisons, amenity impact, AirDNA's data breadth is hard to match, especially on a paid plan. Airbtics fills a similar niche with a global footprint and regulation-awareness features that are valuable for international investors.

When you move from market scanning to deal-level underwriting, the requirements shift. You need a calculator that lets you replace assumptions with actuals: your target ADR, your expected occupancy, your management fee, your insurance quote, your loan terms. That is the gap Chalet fills. It is the only free platform in this group that offers full underwriting controls, including detailed financing with DSCR, alongside integrated market guides and a vetted network of STR professionals. For investors who want both precision and practical support without a subscription, it is the strongest option available.

The practical advice is to layer these tools. Start broad, narrow with data, and finalize with a calculator that reflects your specific deal. Whatever projections you land on, treat them as inputs to your own judgment, not substitutes for it.