01
Anchor on collected rent
Start with actual achievable rent, not aspirational post-renovation assumptions unless they are funded and costed.
Real estate underwriting discipline
Test rental yield before a listing becomes a liability.
AssetRoof gives investors a clean way to estimate gross yield, net yield, and value movement under realistic operating cost assumptions. The calculator is built for acquisition reviews, not for marketing copy.
⭐ 4.7/5 from 312 users
4,217 calculations saved in February
Used by private buyers and small funds
Sample underwriting view
Stress point flagged
At 9.5% vacancy and a 60 bps rate shock, deal spread narrows to 1.1%.
At 9.5% vacancy and a 60 bps rate shock, deal spread narrows to 1.1%.
Net yield6.42%after taxes, vacancy and maintenance
Annual NOI£18,460on a £288,000 purchase case
Value range£276k–£301kusing cap-rate sensitivity
Rental yield and value check
Use monthly rent, acquisition cost, and operating assumptions to see how quickly a nominal yield can fade.
No signup required. Results update instantly.
Results
Net income is annual rent after vacancy, operating costs, and tax assumptions.
Gross yield—
Net yield—
Annual net income—
Estimated value at target cap—
This calculator is for screening and comparison. AssetRoof does not replace legal, tax, or valuation advice.
How the review works
Three quick checks reveal whether the advertised return survives basic underwriting pressure.
02
Strip out friction
Vacancy, management drag, repairs and local taxes have a habit of turning glossy brochures into average deals.
03
Test valuation range
One cap-rate turn can change the exit math. AssetRoof keeps that sensitivity visible before you make an offer.
Market notes from the AssetRoof blog
Short, technical reads for investors who prefer plain numbers over slogans.
YieldWhen a 7% headline yield is really 5.4%
A practical review of cost leakage, rent collection assumptions and where small investors misread net return.
Read →
Mortgage riskMortgage stress tests that deserve a place in every buy box
Rate resets, reserve planning and debt cover levels shape whether a property remains workable after twelve difficult months.
Read →
ValuationWhy cap-rate drift changes more than your exit price
Valuation compression affects refinance options, equity release timing and the margin for repair surprises.
Read →Observed pattern. Investors who log vacancy and maintenance from day one usually make calmer acquisition decisions. The numbers are rarely prettier, but they are easier to trust.
What users say after running a live case
Specific comments from investors, acquisition associates and owners reviewing one address at a time.
Rachel Dunn
Portfolio buyer, Manchester“AssetRoof forced us to stop repeating agent language. One terrace looked fine until the cap-rate sensitivity showed how thin the margin was.”
Marcus Hale
Acquisitions analyst, Bristol“We used the output in a Monday committee pack. The clean annual NOI line saved a round of spreadsheet corrections.”
Imogen Park
Landlord, Leeds“I liked that it was strict. There is no temptation to hide repair drag behind a hopeful rent uplift.”
Frequently asked questions
Direct answers for investors screening rentals, mixed-use units and smaller blocks.
Does the calculator use gross or collected rent
It starts with scheduled rent and then reduces annual income by the vacancy assumption you set.
Can I include management fees
Yes. Add them inside annual operating costs or combine them with repairs if that fits your internal model.
Is the cap-rate value a formal appraisal
No. It is a fast reference point based on net operating income divided by your target market cap rate.
What markets does AssetRoof cover
The logic is market-agnostic. Users still need local tax, insurance and letting assumptions that match the property location.
Why include vacancy on day one
Because empty periods and non-payment happen even in decent buildings. Ignoring them is usually a reporting choice, not a forecast.
Can I share the results
Yes. Use the copy button to move the summary into a memo, chat, or acquisition note.