Plumbing Math & Pressure Calculations for IPC Journeyman Plumber

Convert:

2 3/8” to decimal inches

2.375”

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Convert:

5 5/16” to decimal inches

5.312”

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Convert:

7 15/16” to decimal inches

7.937”

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Convert:

4 13/16” to decimal inches

4.812”

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Convert:

6.187” to fractional inches

6 3/16”

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Convert:

9.625” to fractional inches

9 5/8”

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Convert:

4.125” to fractional inches

4 1/8”

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Convert:

8.875” to fractional inches

8 7/8”

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Convert:

12’ 9 1/4” to decimal feet

12.77’

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Convert:

15’ 11 3/4” to decimal feet

15.98’

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Convert:

4’ 6 1/2” to decimal feet

4.54’

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Convert:

2’ 2 1/2” to decimal feet

2.21’

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Convert:

16.71’ to feet and fractional inches

16’ 8 1/2”

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Convert:

6.75’ to feet and fractional inches

6’ 9”

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Convert:

21.125’ to feet and fractional inches

21’ 1 1/2”

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Convert:

18.83’ to feet and fractional inches

18’ 10”

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Find the area:

a square that is 8” on each side

Area = Side x Side

64 square inches

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Find the area:

a square that is 24’ 3” on each side

Area = Side x Side

588 square feet

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Find the area:

a room that is 8’ 6” in width and 16’ in length

Area = Length x Width

136 square feet

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Find the area:

a room that is 24’ in width and 30’ in length

Area = Length x Width

720 square feet

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Find the area:

a tank that has a diameter of 12 feet

Area = π x radius²

113 square feet

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Find the area:

a tank that has a diameter of 20 inches

Area = π x radius²

314 square inches

Remember the radius is 1⁄2 of the diameter.
π = 3.14

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Convert:

7.58’ to feet and fractional inches

7’ 7”

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How tall is a water tower if the pressure at the base is 55 psi?

127 feet

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What is the pressure if the water source is 155 feet above the point of delivery?

67.1 psi

Calculate the diagonal for a rolling offset made with two 45 degree fittings which has a rise of 8 inches and an offset of 7 inches.

15.03 inches

# Convert: 8’ 7 1/4” to decimal feet

8.60'

Calculate the volume of a cylindrical tank that has a diameter of 30' and a height of 20'. ## Footnote Use Pi = 3.14

14,130 cubic feet

Calculate the diagonal for a pipe that offsets 36 inches using two 45 degree fittings.

50.9 inches

75 gallons into weight measurement in pounds

625 pounds

A toilet costs $257.00 at the supplier. The plumber will sell the toilet with a markup of 25%. What is the new price for the toilet?

$321.25

Find the drop if the grade is 1/8" per foot and the run is 100 feet.

12 1/2"

Calculate the measurement for M if the spread between pipes in parallel is 10" and J is 17". | See Math Practice Test Figure 7-33

12 7/8”

Calculate the measurement for N if the offset between pipes in parallel is 9". | See Math Practice Test Figure 7-33

12 ¾”

Calculate the measurement for O if the spread between pipes is 10" and L is 16". | See Math Practice Test Figure 7-33

20 1/8”

Find the drop if the grade is 1/4" per foot and the run is 30 feet.

7 1/2"

Find the percentage grade if the drop is 5 inches and the run is 40 feet.

# Convert: 2.375” to fractional inches

2 3/8"

# Convert: 8 3/16” to decimal inches

8.187"

Calculate the diagonal for a pipe that offsets 40 inches using two 45 degree fittings.

56.5 inches

# Convert: 39' 9 7/8” to decimal feet

39.82'

Find the drop if the percentage grade is 1% and the run is 40 feet.

4 7/8”

Find the area of a tank base that has a diameter of 18 feet. (Use Pi = 3.14)

254 square feet

Find the grade of a pipe if the drop is 7 1/4" and the run is 58 feet.

1/8" per foot

# Convert: 7' 5 1/8” to decimal feet

7.43'

# Convert: 9 1/8” to decimal inches

9.125"

A faucet costs $675.00 at the supplier. The plumber will sell the faucet with a markup of 25%. What is the new price for the faucet?

$843.75

# Convert: 3.687” to fractional inches

3 11/16"

# Convert: 10 cubic feet into gallons

75 gallons

# Convert: 13.91’ to feet and fractional inches

13' 11"

Calculate the measurement for a special case 90 degree offset using 45 degree elbows for N if the spread between pipes is 12". | See Math Practice Test Figure 7-34

25 7/16"

Calculate the measurement for a special case 90 degree offset using 45 degree elbows for O if the spread between pipes is 12". | See Math Practice Test Figure 7-34

19 1/16"

Calculate the measurement for a special case 90 degree offset using 45 degree elbows for M if the spread between pipes is 12" | See Math Practice Test Figure 7-34

8 1/16"

# Convert: 41,472 cubic inches into cubic feet

24 cubic feet

# Convert: 10 3/4” to decimal inches

10.75"

Calculate the diagonal for a rolling offset made with two 45 degree fittings which has a rise of 5 inches and an offset of 4 inches.

9.05 inches

Find the volume of a tub that is 32” wide, 72” long and 17” deep on inside dimensions.

39,168 cubic inches

# Convert: Find the volume of a tub that is 32” wide, 72” long and 17” deep on inside dimensions.

12 cubic feet

Find the grade of a pipe if the drop is 7" and the run is 56 feet.

1/8" per foot

# Convert: 270 gallons to cubic feet

36 cubic feet

What is the pressure at the base of a water tower that is 115 feet tall?

49.9 psi

Find the area of a room that is 14' in width and 18’ in length.

252 square feet

A fixture costs $167.00 at the supplier. The plumber will sell the fixture with a markup of 20%. What is the new price for the fixture?

$200.40

A faucet costs $425.00 at the supplier. The plumber will sell the faucet with a markup of 15%. What is the new price for the faucet?

$488.75

A water softener costs $765.00 at the supplier. The plumber will sell the water softener with a markup of 45%. What is the new price for the softener?

$1109.25

Find the grade of a pipe if the drop is 18 3/4" and the run is 75 feet.

1/4" per foot

Find the grade of a pipe if the drop is 12 1/2" and the run is 25 feet.

1/2" per foot

Find the grade of a pipe if the drop is 12 1/2" and the run is 200 feet.

1/16" per foot

Find the drop if the grade is 1/4" per foot and the run is 50 feet.

12 1/2"

Find the drop if the grade is 1/4" per foot and the run is 80 feet.

20"

Find the drop if the grade is 1/8" per foot and the run is 50 feet.

6 1/4"

Find the percentage grade if the drop is 12 1/2 inches and the run is 100 feet.

Find the percentage grade if the drop is 40 inches and the run is 160 feet.

Find the drop if the percentage grade is 1% and the run is 80 feet.

9 5/8"

Find the drop if the percentage grade is 2% and the run is 50 feet.

12"

Plumbing Math & Pressure Calculations Flashcards

Develop skills in plumbing calculations and pressure measurements. (75 cards)