Rent or buy?

Set the price and your mortgage, then the rent a similar home costs nearby. The calculator puts the two monthly figures side by side and separates the part of a mortgage that builds equity from the part that, like rent, is simply spent.

Interest in year oneNearly all of the payment on a long term
Rent dataONS private rents by bedroom count
Left outRepairs, service charges, house-price change

Your figures

Deposit

Home pages fill this in with the ONS average for the area and bedroom count.

How the comparison works

Two monthly figures, then a fairer one: the money that is gone either way.

Monthly payment against monthly rent
The repayment mortgage on the price, deposit, term and rate you set, next to the rent you enter. On home pages the rent is the ONS average for a home with that many bedrooms in that area.
What is spent and what is kept
Rent is spent. A mortgage payment is part interest, which is spent, and part capital, which stays yours as equity. In the first year of a 30-year loan at 4.5% most of the payment is interest; the capital share grows every year.
What it leaves out
Buying also costs stamp duty and fees up front, and then repairs, buildings insurance and any service charge. Renting leaves your deposit free to earn interest. Neither side includes a guess at house prices, which is what usually decides the question over ten years.
Source and rulesShowPageRule set 2026.1, last checked on 18 October 2026.The figures are illustrations from the inputs you give and the rules shown, not financial, tax or legal advice. Check them with a mortgage adviser or conveyancer before you rely on them. Your home may be repossessed if you do not keep up repayments on a mortgage secured on it.

Questions people ask

Buying costs more a month. Does that make renting better?

Not on its own. Part of the mortgage payment repays the loan and comes back as equity when you sell; none of the rent does. Compare the interest line with the rent line to see what is actually spent, then weigh the deposit and the costs of moving against the security of owning.

Where does the rent figure come from?

When you arrive from a home page it is the Office for National Statistics average private rent for a home with that number of bedrooms in the area, for the latest month published. New builds often let for more than the average, so adjust it if you know the local market.

Why is the first year’s interest so high?

Interest is charged on the outstanding balance, which is largest at the start. At 4.5% on £270,000 the first year costs about £12,100 in interest and repays about £4,350 of capital. By the last years the split is the other way round.

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