Straightforward calculators for home and tech

Home and money

Mortgages and moving house

Mortgage CalculatorEstimate monthly payments, interest costs, and remaining balance. Open Mortgage Overpayment CalculatorWork out how much extra to pay, and what it saves in interest and years. Open Cost of Selling a HouseItemise agent fees, conveyancing, removals and stamp duty on your next place. Open House Sale What-IfEstimate equity released, deposit, new mortgage and the cash left over. Open

Networking

Networking and developer tools

CIDR CalculatorWork out subnet masks, ranges, and IP counts quickly. Open CIDR RangesReference table of prefixes, masks and address counts for /0 to /32. Open Epoch ConverterTurn a Unix timestamp into a date, or a date into a timestamp. Open

This site does not provide financial advice

The mortgage and house sale tools are estimators, built for planning and for comparing one scenario against another. They cannot take account of your circumstances, and the written guidance on each page is general information rather than advice.

Please speak to a qualified financial adviser, a mortgage broker or your lender before making any decision about a mortgage, a property purchase or a sale. Confirm any figure that matters with them rather than relying on an estimate from this site.

Runs in your browser

Every calculation happens on your own device, and nothing you enter is stored.

No sign-up

No account, no email address, no paywall between you and the answer.

Built for a phone

Readable figures and layouts that reflow properly on a small screen, not a desktop page squeezed down.