Castle Trust is now offering two online calculators which it hopes will make its Partnership Mortgages proposition easier to understand.

The web-based calculators help users work out how much they would have to repay based on their house price and allow users to input their own presumptions about future price growth, or to compare the monthly and overall cost of having a Partnership Mortgage against just having a traditional repayment mortgage.

Castle Trust is awaiting FSA authorisation to offer investors access to UK house price returns and also mortgages that will share the profit or loss with homeowners.

The business also believes the calculators will help customers who take out the company’s Partnership Mortgages to work out partial and full repayments and the impact of making permanent home improvements.

Castle Trust says that its research indicated that the calculators were a key feature in making Partnership Mortgages clearer and easier to understand, as users could calculate financial scenarios based on their own individual circumstances.

Mike Hughes, Castle Trust’s managing director of mortgages, said: “A key theme in preparing for our launch has been making our products as simple and as transparent as possible.