Fiji is about 69 times smaller than Niger.

Niger is approximately 1,267,000 sq km, while Fiji is approximately 18,274 sq km, making Fiji 1.44% the size of Niger. Meanwhile, the population of Niger is ~27.9 million people (27.0 million fewer people live in Fiji).
Tip: This to-scale comparison of Niger vs. Fiji uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.