British Indian Ocean Territory is about 1.3 times bigger than Pitcairn Islands.

Pitcairn Islands is approximately 47 sq km, while British Indian Ocean Territory is approximately 60 sq km, making British Indian Ocean Territory 28% larger than Pitcairn Islands.
Tip: This to-scale comparison of Pitcairn Islands vs. British Indian Ocean Territory uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: British Indian Ocean Territory vs. Pitcairn Islands

Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.