A new online IVF calculator can help predict a couple's chances of conceiving a baby, experts say.

The tool estimates the likelihood of becoming pregnant before and after treatment using data gathered from 114,000 women who underwent IVF or ICSI.

The University of Aberdeen-led research team behind the calculator said it could "help to shape couples' expectations".

British Fertility Society chairman Adam Balen praised their work, which was published in the British Medical Journal on Thursday.

However, he cautioned: "It is important to remember that treatment should be individualised to the patients' particular needs and profile and it can still be difficult to accurately predict the outcome."

A woman's age is among the most important factors when trying to conceive and after the age of 30 the chances of becoming pregnant begin to decline.

During IVF treatment, an egg is removed from the woman's ovaries and fertilised with sperm in a laboratory. The embryo is then implanted in the her womb to develop.

ICSI is similar to IVF but involves only a single sperm, which is injected directly into the egg.

The calculator, which is available on the University of Aberdeen website, predicts a couple's chances of success over up to six cycles of IVF or ICSI.