Useful US Equivalent Measurement Units, Approximates, Estimates, and Rough Conversions

These commonly used USA units of measure and their equivalents, rough estimates, and approximate values are useful in a variety of day to day applications including but not limited to:

HOME:
- cooking in the kitchen
- medicine cabinet in the bathroom
- medications and prescription drugs
- food and drink measurements
- home hobbies
- home work and assignments
- and more...

SCHOOL:
- school projects
- physics subject
- chemistry subject
- mathematics subject
- practical arts and trades subjects
- and more...

BUSINESS/COMMERCIAL:
- drugstores and pharmacies
- canteen, cafeteria, coffee shops, restaurants
- groceries and supermarkets
- shopping centres
- home hardware stores
- factories and warehouses
- manufacturing plants
- and more...

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Note:
The symbol ~ has been used here to mean approximate.

ONE CENTIMETER (cm):
1 cm ~ 0.4 inch
1 cm ~ 2/5 inch

ONE INCH:
1 inch ~ 2 1/2 centimeters
1 inch ~ 2.5 centimetres

ADULT HUMAN BODY PARTS MEASUREMENT APPROXIMATIONS:
nail width of little finger ~ 1 centimeter
1 thumb width ~ 1 inch
1 little finger length ~ 2 inches
1 index finger length ~ 3 inches
1 palm width ~ 4 inches
from index finger to front edge of thumb ~ 5 inches
from index finger to back edge of thumb ~ 6 inches
from middle finger to back edge of thumb ~ 7 inches
from middle finger to the wrist joint ~ 8 inches
1 human foot ~ 12 inches
1 cubit (middle finger to elbow) ~ 1 1/2 foot 
1 cubit (middle finger to elbow) ~ 18 inches
1 step at normal walking pace ~ 2 feet
1 step at normal walking pace ~ 24 inches
1 arm length ~ 2 1/2 feet
1 arm length ~ 30 inches

ONE GRAM:
1 gram of water = 1 cubic centimeter (cc) of water
1 gram of water = 1 ml of water

ONE MILLILITER (ml or mL):
1 ml = 1 cc (cubic centimeter)
1 ml = 16 drops

ONE TEASPOON:
1 teaspoon ˜ 5 mL

ONE TABLESPOON:
1 tablespoon ~ 3 teaspoons
1 tablespoon ˜ 15 mL

ONE FLUID OUNCE:
1 US fluid ounce = 2 tablespoons
1 US fluid ounce = 6 teaspoons
1 US fluid ounce ~ 30 ml

ONE GILL:
1 US gill = 1/2 cup
1 US gill = 4 US fluid ounces
1 US gill = 8 tablespoons

ONE CUP:
1 cup = 16 tablespoons
1 cup ˜ 250 mL

CAN OF SODA, COLA, POP, SOFTDRINK:
1 can of soda pop softdrink ~ 1 1/2 cups
1 can of soda pop softdrink = 355 ml

ONE PINT:
1 pint = 2 cups

BOTTLED WATER:
1 bottled water 500 ml = 1/2 liter
1 bottled water 500 ml ~ 2 cups

GLASS OF WATER:
1 small glass of water ~ 1 pint
1 small glass of water ~ 2 cups
1 big glass of water ~ 2 1/2 cups

ONE QUART:
1 quart ~ 1 liter
1 quart = 2 pints
1 quart = 4 cups

ONE LITER:
1 liter ~ 1 quart
1 liter ~ 2 pints
1 liter ~ 4 cups
1 liter of water = 1 kilogram (kg.)
1 liter of water ~ 2 pounds (lbs.)

ONE GALLON:
1 gallon ~ 4 liter
1 gallon = 4 quarts
1 gallon = 8 pints
1 gallon = 16 cups
1 gallon = 32 gills

ONE PECK:
1 peck ~ 2.3 gallons liquid measure
1 peck = 2 gallons dry measure

ONE DRINKING WATER DISPENSER BOTTLE:
1 commercial drinking water dispenser bottle = 5 gallons
1 commercial drinking water dispenser bottle ~ 19 liters

ONE BUCKET:
1 bucket = 5 gallons liquid measure
1 bucket ~ 4 gallons dry measure

ONE BUSHEL:
1 bushel ~ 9 gallons liquid measure   
1 bushel = 8 gallons dry measure

ONE KEG:
1 keg (beer) = 1/2 beer barrel
1 keg (beer) = 15.5 U.S. gallon 

ONE BARREL:
1 barrel = 31.5 gallons (liquid measure)
1 barrel = 27 gallons (dry measure)
1 U.S. beer barrel = 31 U.S. gallons
1 oil barrel = 42 US gallons
1 barrel (wine) = 38 gallons (liquid measure)
1 barrel (wine) = 32.5 gallons (dry measure)

ONE DRUM (petroleum):
1 drum = 55 gallons liquid measure
1 drum = 47 gallons dry measure

ONE PIPE:
1 pipe ~ 2 drums (petroleum)
1 pipe = 3 barrels (petroleum)
1 pipe = 126 gallons (liquid measure)
 

 PICTURES:

A 5 gallon water dispenser bottle.

A 355 ml canned softdrink approximately 1 and half cup.

A 500 ml bottled water is about 2 cups.

A 710 ml pop softdrink or carbonated beverage.

A big glass is about 2 and half cups.

A cup is 250 ml approximately.

A gallon is equal to 4 quarts (approximately 4 liters).

A pint of ice cream is equal to 2 cups.

A quart of ice cream is equal to 2 pints or 4 cups.

A small glass is about 2 cups.

One cup is equal to 16 tablespoons.

One liter of vinegar is equal to 4 cups (estimate).

One tablespoon is roughly equal to 15 mL.

One teaspoon is roughly equal to 5 mL.

One US fluid ounce is equal to 2 tablespoons and approximately  30 ml.

The cubit or length from the middle finger to the elbow is close to 18 inches.

The distance from the tip of the index finger to the front edge of the thumb is 5 inches approx.

The distance from the tip of the middle finger to the wrist joint is 8 inches approximately.

The human foot is approximately 12 inches.

The index finger is about 3 inches long.

The little finger has a length of about 2.5 inches.

The nail width of the little finger is 1 cm approx.

The palm width is about 4 inches wide.

The width of the thumb is about 1 inch wide.