Congo vs Nigeria

Nigeria is 2.7 times larger than Congo. Congo would fit into Nigeria about 2.7 times.

CongoNigeriaCongo moved onto Nigeria · Equal-area projection
0.37×
Congo is 0.37× the area of Nigeria. Put the other way, Nigeria is 2.7× the size of Congo.
CongoNigeria
Area342,000 km²923,768 km²
Population6,484,437237,527,782
Density19 / km²257 / km²
CapitalBrazzavilleAbuja
RegionMiddle AfricaWestern Africa
CoastlineHas a coastHas a coast
Neighbours54

Why the map you grew up with disagrees

On a Mercator map, area grows with distance from the equator. Congo sits at about 1°S and is stretched to 1.0× its true area; Nigeria at 10° N is stretched to 1.03×. Here the two are distorted about the same amount, so Mercator gets this pair roughly right. The figure above uses the Equal Earth projection, where every square kilometre is drawn the same size.

Questions about this pair

Is Congo bigger than Nigeria?
No. Congo is 2.7 times smaller than Nigeria. Congo covers 342,000 km² and Nigeria covers 923,768 km².
How many times does Congo fit into Nigeria?
About 2.7 times: Nigeria has 2.7× the area of Congo.
Why do Congo and Nigeria look different on Google Maps?
Web maps use the Mercator projection, which stretches area with distance from the equator. Congo is drawn about 1.0× its true area there and Nigeria about 1.03×. For this pair the distortion is similar, so Mercator gets the comparison roughly right. Kartavera uses Equal Earth, where every square kilometre is drawn the same size.
Which has more people, Congo or Nigeria?
Nigeria: 237,527,782 people against 6,484,437. Density: Congo 19 per km², Nigeria 257 per km².