Mosman High School student Callum Predavec received the Mathematics Fourth Award for his work, which calculates the distance between any planet, moon or star in the solar system.
The Planetary Transfer Calculator is also web browser based, which makes it more accessible to people interested in space.
CSIRO education and outreach director Mary Mulcahy said Australian high school students had been recognised by Intel ISEF for their innovative projects over the last few years.
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"The students in the Australian delegation have all shown outstanding commitment to their projects and it is an incredible achievement to have their work showcased alongside students from around the world," Ms Mulcahy said.
"I have no doubt we will see great things from all of these students in the years to come."
BHP Foundation chief executive James Ensor said the success of local students on an international stage was testament to their passion for STEM.
"Improving science, technology, engineering and maths outcomes for young people is at the heart of the foundation's commitment to supporting innovative STEM programs in Australia," Mr Ensor said.
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"We know there's a clear link between science, technology, engineering and math and our future prosperity, so we're delighted to see this next generation of talented Australians recognised for their passion and commitment to solving some of the world's big challenges."
The BHP Foundation and Intel Foundation provide support for the BHP Foundation Science and Engineering Awards Australian delegation attending the fair.
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