The deal maths, free and without an account
These are the same engines the app runs — not a simplified version for marketing. Every figure carries a badge saying whether it was verified, entered, estimated or assumed, and every calculator lists what it assumed to get there. Where we cannot answer honestly, it says so instead of showing you a number.
Maximum offer calculator (UK MAO)
The most you can offer a seller and still leave your end buyer the return they need — worked backwards from the finished value, not from the American 70% rule.
Stamp duty calculator
Stamp Duty Land Tax on a purchase in England or Northern Ireland, band by band, including the additional-property surcharge.
Assignment fee calculator
What your fee actually is once the seller negotiates — and the point at which there is nothing left in the deal for you.
Refurbishment cost estimator
A starting figure for a refurbishment from floor area and condition — for triage, not for offers you cannot walk back.
Flip profit calculator
What a buy-refurbish-sell project actually returns after stamp duty, holding and selling costs — and the most a flip buyer could pay.
BRR calculator (buy, refurbish, refinance)
How much of your capital comes back out on refinance, and how much stays trapped in the deal.
Buy-to-let yield calculator
Gross and net yield on total cash in — price, stamp duty, legals and refurbishment — not on the purchase price alone.
HMO yield calculator
Net yield on a house in multiple occupation, with the heavier operating costs an HMO actually carries.
Buy-to-let mortgage stress test (ICR)
Whether the rent covers the interest at the rate a lender tests against — and the largest loan it will actually support.
Why these are free
Because the arithmetic was never the hard part. Working out stamp duty or a maximum offer is a solved problem, and charging for it would only be charging for the inconvenience of not having it. What is genuinely hard is knowing what a property is worth from real sold prices, keeping a pipeline honest, and matching a deal to a buyer who will actually take it — and that is what the app is for.
There are nine here rather than nineteen. Splitting one engine across three pages with different headings would make the list look longer without answering another question — every one of these answers something the others do not.