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Conversion Tables
Weights & Measures
  SpaCyclopedia Index How to Calculate the Water Volume of a Hot Tub

Hose End Fill Filter

Conversion tables - weights and measures Below are some handy conversions for common measurements used by spa and hot tub owners, plus other helpful formulas and information. NOTE: Most figures are close rounded approximations.

See also: Figuring Spa's Water Volume

U.S. to Metric

Capacity
1/5 teaspoon = 1 milliliter
1 teaspoon = 5 ml
1 tablespoon = 15 ml
1/5 cup = 50 ml
1 cup = 240 ml
2 cups (1 pint) = 470 ml
4 cups (1 quart) = .95 liter
4 quarts (1 gal.) = 3.8 liters

  Weight
1 fluid oz. = 30 milliliters
1 pound = 454 grams


Metric to U.S.

Capacity
1 milliliter = 1/5 teaspoon
5 ml = 1 teaspoon
15 ml = 1 tablespoon
30 ml = 1 fluid oz.
100 ml = 3.4 fluid oz.
240 ml = 1 cup
1 liter = 34 fluid oz.
1 liter = 4.2 cups
1 liter = 2.1 pints
1 liter = 1.06 quarts
1 liter = .26 gallon
  Weight
1 gram = .035 ounce
100 grams = 3.5 ounces
500 grams = 1.10 pounds
1 kilogram = 2.205 pounds
1 kilogram = 35 oz.

Household Measurement Equivalents
Household measures

16 tablespoons = 1 cup
12 tablespoons = 3/4 cup
10 tablespoons + 2 teaspoons = 2/3 cup
8 tablespoons = 1/2 cup
6 tablespoons = 3/8 cup
5 tablespoons + 1 teaspoon = 1/3 cup
4 tablespoons = 1/4 cup
2 tablespoons = 1/8 cup
2 tablespoons + 2 teaspoons = 1/6 cup
1 tablespoon = 1/16 cup
 
2 cups = 1 pint
2 pints = 1 quart
4 quarts = 1 gallon
1 gallon = 231 cubic inches
1 gallon water = 8.34 pounds
3 teaspoons = 1 tablespoon
48 teaspoons = 1 cup
1 teaspoon = 1/6 fl. ounce
6 teaspoons = 1 fl. ounce
1 tablespoon = 1/2 fl. ounce
2 tablespoons = 1 fl. ounce

Water Weight
Water weight conversions

Pounds Grams Kilograms
Cubic centimeter 0.0022 1 0.001
Cubic inch 0.036 16.4 0.016
Liter 2.2 1000 1
Gallon 8.35 3785 3.8
Cubic foot 62.4 28317 28.3

See also: Figuring Spa's Water Volume


PPM (parts per million in water)

1 ppm = 1 mg/L


Electrical Formulas

amps x volts = watts
volts = amps x resistance (in ohms)
resistance = volts / amps
1000 watts = 1 kilowatt
1 kilowatt hour (kWh) = 1000 watts used for 1 hour

Spa electrical

Estimating the Cost of Power Consumption

You can calculate the average operating cost of any electrical appliance by using the following formula, which multiplies kilowatt hours by the electrical rate:

Calculating electrical power consumption kWh x kWh rate = cost
(kilowatt hours used x power company rate = cost)

Example:
What is the monthly cost to operate a spa heater rated at 4,000 watts running for 3 hours per day in heating mode, with a local electrical rate of $0.08 per kilowatt hour?

4 kW x $0.08 rate x 3 hours per day x 30 days = $28.80 per month


 

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