New Caledonia is about 310 times bigger than British Indian Ocean Territory.

British Indian Ocean Territory is approximately 60 sq km, while New Caledonia is approximately 18,575 sq km, making New Caledonia 30,858% larger than British Indian Ocean Territory. Meanwhile, the population of British Indian Ocean Territory is ~3,000 people (292,333 more people live in New Caledonia).
Tip: This to-scale comparison of British Indian Ocean Territory vs. New Caledonia uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: New Caledonia vs. British Indian Ocean Territory

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