Sierra Leone is approximately 71,740 sq km, while Estonia is approximately 45,228 sq km, making Estonia 63.04% the size of Sierra Leone. Meanwhile, the population of Sierra Leone is ~6.6 million people (5.4 million fewer people live in Estonia).
This to-scale map shows a size comparison of Sierra Leone compared to Estonia. For more details, see an in-depth quality of life comparison of Estonia vs. Sierra Leone using our country comparison tool.