Size Duel deck
Which is bigger? Every item has one measured dimension: length, height, height above sea level or mass, and duels only compare the same one. Practice rounds never change your daily streak.
Ten duels across the whole deck, easy to hard.
Practise one category
Animals
- Atlantic puffinmass
- Aye-ayemass
- Badger (European)mass
- Bald eaglemass
- Baryonyxlength
- Beaver (Eurasian)mass
- Bee hummingbirdlength
- Bee hummingbirdmass
- Blue whalelength
- Blue whalemass
- Brown ratmass
- Capybaralength
- Capybaramass
- Carnotauruslength
- Cheetahmass
- Eagle-owlmass
- Emperor penguinheight
- Fossalength
- Gallimimuslength
- Giant anteaterlength
- Giraffeheight
- Giraffemass
- Gorilla (male)height
- Great white sharklength
- Hazel dormousemass
- Hippopotamusmass
- House mouse (wild)mass
- Human red blood celllength
- Humpback whalelength
- Indian rhinoceros (male)mass
- Jaguar (male, Pantanal)mass
- Kentrosauruslength
- King penguinmass
- Koala (male, southern)mass
- Komodo dragonlength
- Lion (male)mass
- Maned wolfmass
- Meerkatmass
- Mole (European)length
- Moose (male)mass
- Northern hairy-nosed wombatmass
- Okapimass
- Orca (male)length
- Otter (European)mass
- Platypuslength
- Polar bear (male)length
- Polar bear (male)mass
- Rabbit (wild)length
- Raccoonmass
- Red pandalength
- Red squirrelmass
- Ring-tailed lemurmass
- Saltwater crocodile (male)length
- Sperm whale (male)length
- Styracosauruslength
- Tarbosauruslength
- Triceratopslength
- Tuatara (male)mass
- Velociraptorlength
Space
- Asteroid Itokawalength
- Callistolength
- Cereslength
- Dionelength
- Earthlength
- Earthmass
- Enceladuslength
- Europalength
- Ganymedelength
- Hoba meteoritemass
- Iapetuslength
- Jupiterlength
- Jupitermass
- Marslength
- Marsmass
- Mercurylength
- Mercurymass
- Mimaslength
- Neptunemass
- Phoboslength
- Plutolength
- Plutomass
- Rhealength
- Saturnmass
- The Moonlength
- The Moonmass
- The Sunlength
- The Sunmass
- Titanlength
- Tritonlength
- Uranusmass
- Venuslength
Buildings, bridges and dams
- Akashi Kaikyō Bridgelength
- Arc de Triompheheight
- Atomiumheight
- Avala Towerheight
- Beijing TV Towerheight
- Berlin TV Towerheight
- Brooklyn Bridge (main span)length
- Burj Khalifaheight
- Cairo Towerheight
- Christ the Redeemerheight
- Christiansborg Towerheight
- CN Towerheight
- Cologne Cathedralheight
- Colosseumheight
- Eiffel Towerheight
- Elizabeth Tower (Big Ben)height
- Forth Bridgelength
- Forth Road Bridge (span)length
- Giotto’s Campanileheight
- Golden Gate Bridge towerheight
- Gran Torre Santiagoheight
- Grande Dixence Damheight
- Great Belt East Bridgelength
- Great Pyramid of Gizaheight
- Hoover Damheight
- Humber Bridge (main span)length
- Itaipu Damheight
- Leaning Tower of Pisaheight
- Lincoln Memorial statueheight
- London Eyeheight
- Mauvoisin Damheight
- Michelangelo’s Davidheight
- Millau Viaductlength
- Näsinneula, Tampereheight
- Nurek Damheight
- Øresund Bridgelength
- Ostankino Towerheight
- Petronas Towersheight
- Pont de Normandielength
- Riga TV Towerheight
- Sendai Daikannonheight
- Sky Tower, Aucklandheight
- SkyTower, Bucharestheight
- St Mark’s Campanileheight
- St. Peter’s Basilicaheight
- Statue of Libertyheight
- Sydney Harbour Bridge (arch)length
- Sydney Town Hall organlength
- Taipei 101height
- Tallinn TV Towerheight
- Tashkent Towerheight
- The Shard, Londonheight
- Tokyo Skytreeheight
- Tokyo Towerheight
- Tower Bridgelength
- Turning Torso, Malmöheight
- Washington Monumentheight
- Willis Towerheight
- Žižkov TV Tower, Pragueheight
Mountains
- Aconcaguaheight above sea level
- Allalinhornheight above sea level
- Alphubelheight above sea level
- Annapurna Iheight above sea level
- Aoraki / Mount Cookheight above sea level
- Aukštojasheight above sea level
- Bazardüzüheight above sea level
- Ben Nevisheight above sea level
- Breithorn (west summit)height above sea level
- Cotopaxiheight above sea level
- Denaliheight above sea level
- Dom (Valais)height above sea level
- Dufourspitzeheight above sea level
- Finsteraarhornheight above sea level
- Halti (Finnish side)height above sea level
- Jungfrauheight above sea level
- K2height above sea level
- Lagginhornheight above sea level
- Maglićheight above sea level
- Matterhornheight above sea level
- Mauna Keaheight above sea level
- Mauna Loaheight above sea level
- Moldoveanuheight above sea level
- Mont Blancheight above sea level
- Mount Aragatsheight above sea level
- Mount Araratheight above sea level
- Mount Elbrusheight above sea level
- Mount Elgon (Wagagai)height above sea level
- Mount Everestheight above sea level
- Mount Fujiheight above sea level
- Mount Kenyaheight above sea level
- Mount Kilimanjaroheight above sea level
- Mount Korabheight above sea level
- Mount Kosciuszkoheight above sea level
- Mount Olympusheight above sea level
- Mount Rainierheight above sea level
- Mount Teideheight above sea level
- Mount Vesuviusheight above sea level
- Musalaheight above sea level
- Nadelhornheight above sea level
- Nanga Parbatheight above sea level
- Ojos del Saladoheight above sea level
- Puncak Jayaheight above sea level
- Rysy (Polish summit)height above sea level
- Scafell Pikeheight above sea level
- Schreckhornheight above sea level
- Strahlhornheight above sea level
- Suur Munamägiheight above sea level
- Table Mountainheight above sea level
- Triglavheight above sea level
- Zugspitzeheight above sea level
Ships, aircraft and spacecraft
- A-4E Skyhawklength
- AH-1F Cobralength
- Airbus A321length
- Airbus A330-300length
- Airbus A350-900length
- Airbus A380length
- Apollo lunar rovermass
- Avro Lancasterlength
- Avro Vulcan B.2length
- B-24D Liberatorlength
- B-25J Mitchelllength
- B-29 Superfortresslength
- B-36J Peacemakerlength
- B-47E Stratojetlength
- B-52B Stratofortresslength
- Big Boy locomotivelength
- C-141B Starlifterlength
- Carpow logboatlength
- Cassini dishlength
- CH-47D Chinooklength
- Chandrayaan-1mass
- Concordelength
- Curiosity roverlength
- Curiosity rovermass
- Cutty Sark (width)length
- Dawn (panels open)length
- DHC-2 Beaverlength
- Douglas DC-3length
- English Electric Lightninglength
- F-15A Eaglelength
- F-4C Phantom IIlength
- F-86H Sabrelength
- F/A-18A Hornetlength
- F6F-5 Hellcatlength
- Gloster Meteor F.4length
- Gossamer Albatrossmass
- Hawker Hunter F.6length
- Herschel Space Observatorymass
- Hindenburg airshiplength
- Hubble Space Telescopelength
- Hughes H-4 “Spruce Goose”length
- Huygens probemass
- Ingenuity helicoptermass
- International Space Stationlength
- International Space Stationmass
- James Webb Space Telescopemass
- KC-135A Stratotankerlength
- Landsat 2mass
- Lockheed U-2 (early U-2C)length
- Lunokhod 1 rovermass
- MASCOT landermass
- New Horizons dishlength
- P-38J Lightninglength
- P-47D Thunderboltlength
- P-51D Mustanglength
- Parker Solar Probemass
- PBY-5A Catalinalength
- Philae landermass
- Pragyan rovermass
- RMS Queen Marylength
- RMS Titaniclength
- RMS Titanicmass
- Robinson R44 Raven IIlength
- Saturn V with Apolloheight
- SLS with Orion (Artemis I)height
- Solar Orbitermass
- Sopwith Camellength
- Space Shuttle orbiterlength
- Spirit rovermass
- Sputnik 1mass
- SR-71 Blackbirdlength
- SS Great Britainlength
- SS United Stateslength
- Stearman PT-17 Kaydetlength
- T-6G Texanlength
- Tiger Mothlength
- UH-1H Hueylength
- USS North Carolinalength
- Vasa (warship)length
- Venera 7 (whole spacecraft)mass
- Wright Flyer (1903)length
- XMM-Newtonmass
Rivers, falls and long things
- Angel Fallsheight
- Bridalveil Fallheight
- Channel Tunnellength
- Dettifossheight
- General Sherman treeheight
- Gotthard Base Tunnellength
- Grand Canyonlength
- Great Barrier Reeflength
- ʻAkaka Fallsheight
- Illilouette Fallheight
- Krimml Waterfallsheight
- Kummakivi boulderlength
- Lake Baikallength
- Loirelength
- Looking Glass Fallsheight
- Lower Calf Creek Fallsheight
- Lower Falls (Yellowstone)height
- Marathonlength
- Minnehaha Fallsheight
- Multnomah Fallsheight
- Nevada Fallheight
- Noccalula Fallsheight
- Palouse Fallsheight
- Panama Canallength
- Rhinelength
- Rhônelength
- Ribbon Fallheight
- Seikan Tunnellength
- Seinelength
- Sentinel Fallheight
- Shoshone Fallsheight
- Silver Strand Fallheight
- Snoqualmie Fallsheight
- Staubbach Fallsheight
- Strait of Gibraltarlength
- Suez Canallength
- Sutherland Fallsheight
- Toccoa Fallsheight
- Uluruheight
- Upper Falls (Yellowstone)height
- Vernal Fallheight
- Yosemite Fallsheight
Sport, food and everyday things
- 1 cent euro coinlength
- 1 cent euro coinmass
- 1 euro coinlength
- 1 euro coinmass
- 10 euro note (first series)length
- 5 euro note (first series)length
- A3 sheet of paperlength
- A4 sheet of paperlength
- Alexander Pianolength
- American football fieldlength
- Badminton courtlength
- Badminton net (at the posts)height
- Baguette (Paris)mass
- Balance beamlength
- Baseballmass
- Basketball (size 7)length
- Basketball (size 7)mass
- Basketball rim (NBA)height
- Bocce ballmass
- C5 envelopelength
- CD-ROMlength
- Cricket ball (men’s)mass
- Cricket bat (maximum)length
- Cricket pitchlength
- Cricket stumpheight
- Discus (men’s)mass
- DL envelopelength
- Emille Bellmass
- Emmental cheese wheelmass
- Euro palletlength
- Fencing pistelength
- Field hockey pitchlength
- Football (size 5)length
- Football (size 5)mass
- Football goalheight
- Football pitch (international)length
- Giant taiko drumlength
- Giant tuba “Ilse”height
- Giant violin (Germany)length
- Hammer (men’s)mass
- Handball (men’s size 3)mass
- Handball courtlength
- Handball goalheight
- Hen’s egg (medium)mass
- Hurling ball (sliotar)mass
- Javelin (men’s)mass
- Lacrosse ballmass
- Netball courtlength
- Ostrich eggmass
- Petersglocke, Colognemass
- Pickleball courtlength
- Pineapplemass
- Pummerin bell (Vienna)length
- Rugby ballmass
- Shot (men’s)mass
- Shuttlecockmass
- Squash court (singles)length
- Stone of Destinymass
- Swimming pool (long course)length
- Table tennis ballmass
- Table-tennis tablelength
- Tennis balllength
- Tennis ballmass
- Tennis net (centre)height
- US Letter paperlength
- Volleyballmass
- Volleyball courtlength
- Volleyball net (men’s)height
- Weightlifting bar (men’s)mass
The body, cells and particles
- Actin filamentlength
- DNA double helixlength
- E. coli bacteriumlength
- Electronmass
- Ferritinlength
- Human brainmass
- Human egg celllength
- Human heartmass
- Human kidney (one)mass
- Human livermass
- Human pancreasmass
- Human spleenmass
- Human thyroid glandmass
- Microtubulelength
- Nucleosomelength
- Pithoviruslength
- Polioviruslength
- Protonmass
- Tobacco mosaic viruslength
Surprising comparisons
Questions people get wrong, answered from this deck’s checked data and drawn to scale. All comparisons
- Is Pluto wider than Earth’s Moon?
- Is the Washington Monument taller than the Great Pyramid of Giza today?
- Is the Eiffel Tower taller than Elizabeth Tower (Big Ben)?
- Is the Eiffel Tower taller than the Statue of Liberty including its pedestal?
- Is Mars wider than Earth in mean physical diameter?
- Is the Burj Khalifa taller than the Eiffel Tower with its antennas?
- Is Jupiter’s equatorial diameter larger than the Sun’s diameter?
- Is a badminton net at the doubles sidelines lower than a men’s volleyball net at the centre?
- Is Mauna Kea higher than Mount Everest above sea level?
- Is Mount Everest higher than Kilimanjaro above sea level?
- Is a badminton net at the doubles sidelines higher than a tennis net at the centre?
- Is Mercury wider than the Moon in physical diameter?
- Is Burj Khalifa taller than Taipei 101 when measured to their architectural tops?
- Is Mount Kilimanjaro higher above sea level than K2?
- Is a blue whale typically longer than an adult male sperm whale?
- Is an adult blue whale longer than an adult male orca?