It's about one-and-one-tenth times as heavy as an Octopus
In other words, the weight of an Octopus is 0.910 times 840,000 grains.(for Giant Pacific Octopus, Enteroctopus) (Adult, average)
The adult North Pacific Giant Octopus usually weighs around 770,000 grains. It is the largest octopus species and is known for its considerable intelligence, including the ability to open jars, solve mazes, and mimic other octopuses.
It's about one-and-one-fourth times as heavy as a Toilet
In other words, 840,000 grains is 1.250 times the weight of a Toilet, and the weight of a Toilet is 0.80 times that amount.(KOHLER Round front sitting flush toilet, model #K-11471-0)
The weight of a typical round front sitting flush toilet is 673,000 grains. The Indian town of Musiri in Tamil Nadu state features the world's only paying toilet, which rewards its users up to 10¢ Indian (10 paisas) per visit and uses the waste for compost and fertilizer.
It's about three-fourths as heavy as a Beer Keg
In other words, 840,000 grains is 0.74770 times the weight of a Beer Keg, and the weight of a Beer Keg is 1.3370 times that amount.(for US half-barrel, full keg; draft beer; including keg itself, stainless steel)
A typical, half-barrel beer keg weighs 1,123,000 grains when full. A keg of this size contains 15.5 gallons of beer, or the equivalent of 6.8 cases.
It's about two-thirds as heavy as a Kangaroo
It's about one-and-nine-tenths times as heavy as a Dalmatian
In other words, 840,000 grains is 1.850 times the weight of a Dalmatian, and the weight of a Dalmatian is 0.5410 times that amount.(a.k.a. Dalmatinac, a.k.a. Carriage Dog, a.k.a. Spotted Coach Dog, a.k.a. Firehouse Dog) (FCI standard; male)
The Fédération Cynologique Internationale (FCI) calls for Dalmatians to weigh between 455,000 grains. The association of the breed with fire departments (and similarly with Budweiser Beer and its team of Clydesdales) stems from their affinity for horses, having been used historically as carriage dogs capable of guiding horse-drawn fire engines to the sites of blazes.
It's about one-third as heavy as a Panda Bear
In other words, the weight of a Panda Bear is 2.80 times 840,000 grains.(a.k.a. Giant Panda, Ailuropoda melanoleuca)(Adult, male)
An adult, male Giant Panda weighs up to 2,300,000 grains. Despite having the digestive system of a carnivore, the panda eats only bamboo and must eat up to 99,000 grains of it per day to compensate for the limited energy the plant provides.
It's about one-third as heavy as a Reindeer
In other words, 840,000 grains is 0.3290 times the weight of a Reindeer, and the weight of a Reindeer is 3.04 times that amount.(for Rangifer tarandus granti, adult, bull) (a.k.a. Caribou) ()Rangifer tarandus)
An adult, male reindeer weighs between 2,550,000 grains. Reindeer undertake a lengthy annual migration, with some herds traveling up to 5,000 km.
To all those observing, Merry Christmas from the Measure of Things.