European travel firm GoEuro looked into issues such as how easy it is to get a passport, which countries it offers access to without a visa, its price and how long it is valid for.
The company's study suggested that a passport from Denmark is the sixth most powerful in the world, trailing only Sweden, Finland, Germany, the UK and the US.
Those with a passport from any of the top five nations can enter 174 countries without a visa, while a Danish passport provides visa-free entries into 173 countries.
“Many of the top-ranked countries have similar access but some examples of differences in visa access are: Côte d'Ivoire, where Sweden and Denmark require a visa but Finland does not, and Mozambique, where Swedes need a visa but not the Danes. Rwanda requires a visa from Denmark and Switzerland but not Sweden or Finland,” Molly Levinson, a spokesperson for GoEuro, told The Local.
A Danish passport is among the cheapest, with GoEuro calculating that it would take Danes just three hours of work to afford the roughly $95 document. The cost of a Danish passport varies by age, with those 18-64 paying 626 kroner and children and seniors paying less fees. GoEuro said it calculated the Danish costs using the average of the four price structures.
Sweden's passport was the most affordable, costing the equivalent of $43 (€40, £28, 300 kroner). By contrast, British passports are priced at around $110 (€102, £72.50, 768 kroner) while Americans pay $135 (€126, £28, 943 kroner).
Denmark has had biometric passports since 2012 that require the fingerprints of the holder. Last month, a software glitch led to nearly 11,000 Danes being issued a passport without the obligatory fingerprints, making them technically invalid for international travel.