If you speak only one language, you can talk to at most 18% of the world. Add a second, and that number jumps, but which second language, and which third, gives you the most coverage? The answer depends on what you’re optimizing for: raw speaker count, number of countries, or how much of the internet opens up to you.
1. English
EnglishAround 1.5 billion people speak English, including second-language speakers. It is official or widely used in over 60 countries across every continent, and roughly 55% of all web content is in English.
But 18% of the world population is still 18%. 82% of humans are not comfortable in English. Starting here is practical, not sufficient.
2. Mandarin Chinese
Mandarin ChineseMandarin has over 900 million native speakers, more than any other language. Its geographic reach is narrower, concentrated in China, Taiwan, and Singapore, so it adds fewer countries to your list than languages spread across multiple continents.
What it adds is depth. English plus Mandarin covers roughly 35% of the world’s population, and Mandarin is the second most used language on the internet at around 11% of web content.
3. Spanish
SpanishSpanish is official in 20 countries across two continents, from Patagonia to the Pyrenees, from the Caribbean to the Pacific coast. It is also the third most used language online.
Adding Spanish brings cumulative reach to about 42% of the world’s population and nearly 80 countries.
4. Hindi-Urdu
HindiHindi and Urdu are mutually intelligible in spoken form and together cover over 600 million speakers across South Asia, one of the most linguistically dense regions on the planet. Hindi serves as a bridge language across much of India, and Urdu fills the same role in Pakistan.
With these four languages, you can hold a conversation with roughly half the world.
5. The Fifth Slot: French, Arabic, or Portuguese?
The fifth language depends on what you want to do with it.
French
FrenchFrench is spoken across 29 countries, with the fastest growth in sub-Saharan Africa. The Organisation internationale de la Francophonie projects 700 million French speakers by 2050, with the majority in Africa. If you care about where languages are heading rather than where they are now, French covers the most ground.
Arabic
Standard ArabicArabic in its various dialects is spoken across 25 countries in the Middle East and North Africa. Modern Standard Arabic gives you access to news, literature, and formal communication across the entire Arab world, though local dialects (Egyptian, Levantine, Gulf, Maghrebi) differ enough that MSA alone won’t carry casual conversation everywhere.
Portuguese
PortuguesePortuguese gives you Brazil (210 million people), Portugal, Mozambique, Angola, and several other African nations. Brazil alone makes it a serious contender, and the combined Lusophone world spans four continents.
So Which Five?
There is no single best set. If you optimize for speaker count, Hindi-Urdu outranks French. If you optimize for number of countries, French outranks Mandarin. If you optimize for internet access, Mandarin and Spanish both pull ahead of Hindi.
The pattern that holds across all metrics: even two or three languages beyond your first dramatically changes how much of the world you can reach. The gains from a second language are larger than from a third, and so on, but the first few additions matter most.
Head over to the mossyrune to see exactly how your language combination lights up the map.
Sources: Ethnologue, W3Techs Web Content Language Statistics, Organisation internationale de la Francophonie, 2022 Report, Eberhard, Simons, and Fennig (eds.), Ethnologue: Languages of the World, 27th Edition