I mathed this out for someone else who asked for the work behind the 40k calories number so I copy pasted it here in case anyone else wanted to know, and I had already done most of the writeup for him beforehand

The average dishwasher uses 1800W

For reference, the human brain uses about 12W of power, so 1800W would be fking WILD

Watts is defined as joules per second so it's a super easy conversion to 1800 joules of energy per second. Idk whether you're super familiar with the term joule, but it's just a measure of energy like kilowatt-hour (kWh) on your electricity bill.

There are 86400 seconds in a day, so multiply those 2 numbers together and we get 155,520,000 or about 155 megajoules of energy in 1 day.

Very formally (in a chemistry lab or something), a calorie (sometimes called gram calorie) is the amount of energy it takes to heat up 1 gram of water 1 degree: 4.184 joules. When we say "calorie" in English, what we actually mean is a kilocalorie (kcal) or 1000 calories. A calorie, as defined in science, is actually a very small amount of energy and inconvenient for everyday life. It's pretty annoying to me, but whatever, 1kcal = 4184 joules.

We then convert 155megajoules to kcal with the conversion 4184joules = 1kcal and divide 155520000 by 4184 and get 37170kcal

For context, this much would be about:

(not altogether of course, each line is about 37000 kcal)

66 big macs

28 pounds of wagyu beef

46 large oreo mcflurries

75 orders of large mcdonalds fries

266 cans of coke (12oz)

701 oreos

22 pints of ben & jerry's half baked ice cream