Tanzania is approximately 947,300 sq km, while United Kingdom is approximately 243,610 sq km, making United Kingdom 25.72% the size of Tanzania. Meanwhile, the population of Tanzania is ~58.6 million people (7.2 million more people live in United Kingdom).
This to-scale map shows a size comparison of Tanzania compared to United Kingdom. For more details, see an in-depth quality of life comparison of United Kingdom vs. Tanzania using our country comparison tool.