It's about as big as a Golf Ball.
In other words, the size of a Golf Ball is 1.0000091 times 813.68 drops.(per R&A-USGA Rules of Golf)
It's about two-thirds as big as a Golf Ball (packed).
In other words, 813.68 drops is 0.639994148 times the size of a Golf Ball (packed), and the size of a Golf Ball (packed) is 1.56251429 times that amount.(64% packing density) (per R&A-USGA Rules of Golf)
Dictated by the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), a golf ball must have a volume of at least 813.68 drops. Golf balls are not required to have the familiar dimpled pattern, but the design has been popular since its invention in 1905 because it reduces drag while increasing lift.
It's about three-fifths as big as an Egg (Chicken).
In other words, the size of an Egg (Chicken) is 1.7 times 813.68 drops.(hen; USDA large size; uncooked)
A typical egg — of large size as defined by the United State Department of Agriculture — has a volume of 1,400 drops. Each year, American farms produce 69,000,000,000 eggs.
It's about two times as big as a Marshmallow.
In other words, the size of a Marshmallow is 0.5 times 813.68 drops.
It's about one-third as big as a Puck (Hockey).
In other words, 813.68 drops is 0.351228788 times the size of a Puck (Hockey), and the size of a Puck (Hockey) is 2.847147028 times that amount.(Ice hockey)
It's about one-fourth as big as a Tennis Ball.
In other words, 813.68 drops is 0.2583 times the size of a Tennis Ball, and the size of a Tennis Ball is 3.871 times that amount.(ITF Standard; for Type 2 ball)
It's about four times as big as a Gumball (packed).
In other words, 813.68 drops is 4.1 times the size of a Gumball (packed), and the size of a Gumball (packed) is 0.24 times that amount.(64% packing density) (commercial-grade vending machine standard size)