Topics

Explore the size of everything, by topic

Every size on this site belongs to a topic, from atoms and viruses to dinosaurs and aircraft carriers. A topic page lists its sizes from the smallest to the largest and draws the whole range to scale, so you can see how far apart they really are. Topics marked as playable are also levels in the Magnitudle app, where you guess each size before you see the answer. Pick a topic to start.

Food & DrinkFrom a 1 mm poppy seed to a 45 cm (1 ft 6 in) wheel of Parmesan cheese: seeds, grains, fruit, vegetables and everyday food, sorted by size.Playable in the app41 sizes5 levels in the app41 size pages
Micro WorldFrom a carbon atom about 0.34 nm across to a 5 mm colony of cyanobacteria: molecules, viruses, bacteria, pollen and human cells, sorted by size.Playable in the app85 sizes5 levels in the app77 size pages
MilitaryFrom a 9 cm (3.54 in) hand grenade to a 333 m (1,093 ft) aircraft carrier: rifles, tanks, missiles, helicopters, submarines and battleships.Playable in the app124 sizes50 levels in the app122 size pages
Prehistoric LifeFrom a 1.5 mm fossil animal to a 30 m (98 ft) coal-age tree: dinosaurs, mammoths, sabre-toothed cats and early humans, sorted by size.Playable in the app116 sizes20 levels in the app115 size pages
NatureFrom a fairyfly wasp about 140 µm long to Greenland, about 1,050 km (652 mi) wide: animals, plants, lakes, canyons and islands, sorted by size.176 sizes169 size pages

Want to see two things side by side? Compare any two sizes, drawn to true scale.

524 size pages

All size pages

Every size page on the site, grouped by topic.

Food & Drink: 41 size pages

Micro World: 77 size pages

Military: 122 size pages

Nature: 169 size pages

Prehistoric Life: 115 size pages