Years required for population to double at current growth rate (2026)

Barbados leads the world in years required for population to double at current growth rate at 2.7K years in 2026, followed by Grenada (2.7K years) and San Marino (778.82 years). Trinidad and Tobago (686.28 years) and Jersey (672.96 years) close out the top 5. Next up, Belgium (558.99 years) and Saint Kitts and Nevis (517.27 years). France (505.95 years), Nepal (481.35 years), and Guernsey (471.53 years) round out the top ten. The gap across this list is wide — Barbados has 5.7× the value of Guernsey (471.53 years). Five of the top ten are in Europe. Among these countries, Grenada saw the largest year-over-year change at +184.6%.