What’s included · Mortgage and yield
“What would that cost me a month?”
Answered on the listing itself, prefilled with that property’s asking price, so nobody has to open a calculator in another tab. With rental yield alongside it for the landlord audience, which most agency sites leave out entirely.
It is the second question, every time
A buyer reads the asking price and immediately converts it into a monthly figure, because that is the number that decides whether they can live there.
If your page does not do that for them, they do it somewhere else — and the somewhere else is usually a bank or a portal, which is a strange moment to hand your visitor over.
For landlords the equivalent question is the yield, and almost no agency website answers it. A letting agent who shows yield on the listing is speaking directly to the person they most want to hear from.
How it behaves
Prefilled from the property
The asking price is already in it. A buyer changes the deposit and the term, and nothing else.
Rental yield for landlords
Gross yield from the asking price and the achievable rent, on lettings stock and on anything a landlord might buy.
Current rates, not a guess
A sensible default rate maintained centrally, so the figure stays plausible rather than quietly dating.
Routes to your adviser
If you have a financial services arm or a broker you refer to, the calculator hands people to them. That is a referral your website can earn on its own.
Honest about what it is
An illustration, labelled as one, not advice. The regulated conversation belongs with whoever is qualified to have it.
Works on a phone
Proper number inputs and a result you can read without zooming, which is not true of most embedded calculators.