Country vs Country: How to Run Any War Simulator Matchup on WorldRelat
2026-09-26 · by Jordi Fuster
If you searched something like "country war simulator," you're probably looking for a straightforward way to pit any two nations against each other and see a real number come out the other end. That's exactly what WorldRelat's War Simulator does, and it takes about ten seconds to run once you know where to look. Here's the short version, plus two real examples with the actual results.
Pick your countries
Each of the two teams has its own search box — type a few letters of a country's name, click it (or press Enter) to add it, and repeat for as many countries as you want on that side. A team can be a single country or a small alliance; there's no limit beyond the roughly 204 countries WorldRelat tracks. Click the × on any chip to remove a country before you run the comparison.
Example 1 — a tense pairing: Poland vs Russia
Poland now spends a larger share of its GDP on defense than any other NATO member, largely because of exactly this kind of matchup. Run it one-on-one against Russia and the result is 35.3% to 64.7% in Russia's favor — a real gap driven by population and economy size, though it says nothing about NATO's Article 5 commitment, which is the actual reason this particular matchup stays hypothetical.
Example 2 — a calmer pairing: Brazil vs Argentina
Not every matchup needs to involve an active rivalry. Brazil and Argentina have a long history of regional competition but no serious tension today, and running them against each other gives 62.6% to 37.4% in Brazil's favor — mostly a function of Brazil's much larger population and economy. It's a good example of using the tool out of pure curiosity rather than to model any real scenario.
Reading the result honestly
Every percentage the simulator produces comes from the same four measurable inputs — military expenditure, GDP, population, and active-plus-reserve personnel — combined the same specific way every time. It's not modeling terrain, alliances, logistics or political will, so treat the number as "who has more raw capacity," not "who would actually win."
Ready to try your own matchup? Head to the War Simulator and build any pairing you're curious about — the more countries you add per side, the more interesting the per-country breakdown gets.