And what’s the most popular item at the most popular fast food chain on Earth, you ask?

Per Business Insider, the second most popular Mickey D’s item of all time is the Big Mac.

Estimates suggest more than 3.6 billion Happy Meals have been sold worldwide.

Chick fil a fried chicken sandwich

Courtesy of Chick-fil-A

In fact, in 2006 KFCsold more than one billion chicken dinners.

Check out this list ofSubway subs, ranked by nutrition, to see how your favorites stack up.

In fact, Wendy’s sells about 300 million of the milkshake-like beverages each year.

Mcdonalds french fries

Courtesy of McDonald’s

In addition to thousands of stores stateside, Burger King has franchises in 69 other countries around the world.

It’s estimated the chain sells millions of Whoppers each year.

The bean burrito, nacho cheese Doritos locos taco, and nachos round out the top five.

McDonalds big mac

Courtesy of McDonald’s

Fun fact from Chick-fil-A itself: their waffle fry recipe has remained unchanged since its debut in 1985.

(Right behindsoda!)

Though DQ serves burgers, fries, and other savory items, its ice-cream based Blizzards are most popular.

Mcdonalds happy meal

Courtesy of McDonald’s

Other popular KFC China offerings include a double Sichuan spicy chicken burger and a curry pork chop with rice.

KFC original chicken

Courtesy of KFC

Subway italian bmt

Subway/Facebook

Pizza hut pepperoni pizza

Pizza Hut/Facebook

Wendys frosty

Wendy’s/Facebook

Burger king whopper sandwich

Burger King/Facebook

Taco bell crunchy taco

Courtesy of Taco Bell

Chick fil a waffle fries

Chick-fil-A

Chick fil a fried chicken sandwich

Courtesy of Chick-fil-A

Dairy queen blizzard

Courtesy of Dairy Queen

Mcdonalds fillet o ebi japan

yannconz/Flickr

KFC china shrimp sandwich

ibeplu/YouTube

KFC india potato krisper

Courtesy of KFC