An analysis of more than 200 rice types from around the world by the CSIRO and the IRRI found that rice GI ranges from 48 to 92, with an average of 64.
Low GI foods are those 55 and less, medium GI are measured between 56 and 69 and high GI is 70 and above.
Melissa Fitzgerald from the IRRI said the widely grown Indian rice variety Swarna had a low GI while Australian varieties like Doongara and Basmati had a medium GI.
Dr Tony Bird, a CSIRO Food Futures Flagship researcher, said the results would allow people to make more informed choices about what type of rice to eat.
People aiming for a low-GI diet could swap high GI rice for lower GI rice, Bird said.
It would also enable growers to develop low-GI rice varieties and could assist people with conditions like diabetes, he said.
"This is good news for diabetics and people at risk of diabetes who are trying to control their condition through diet, as it means they can select the right rice to help maintain a healthy, low-GI diet," he said.
- AAP