How Much Does Water Weigh? Calculators, Charts & Guide (2024)

ByJack Gray, Roof Online Editor• Last updated July 27, 2024

How Much Does Water Weigh? Calculators, Charts & Guide (1)

Table of Contents

  • Water Weight Calculator (by Area and Depth)
  • How to Calculate the Weight of Water
  • Weight of Water by Unit of Volume
    • About This Table
    • Table 1: Weight of Water by Unit of Volume
  • Weight of Water by Temperature
    • Table 2: Density of Water by Temperature
  • Water Weight per Inch per Square Foot
    • About This Table
    • Table 3: Weight of Water per Inch per Square Foot
  • Related Articles

Water Weight Calculator (by Unit & Temp.)

Note that water is at maximum density (or weight per unit of volume) at 39.2°F/4.0°C. The weight of water is usually given for water at maximum density by default, but we are using room temperature (70°F) as the default setting.

If you select a temperature other than 39.2°F/4.0°C, the weight values calculated will likely be slightly different than water weight values found elsewhere.

Water Weight Calculator

Water Weight Calculator

Total Weight:

Water Weight Calculator (by Area and Depth)

Water Weight by Area and Depth Calculator

Water Weight Calculator
By Area and Depth

Approx. Total Weight:

How to Calculate the Weight of Water

To find the weight of water, you need to pick which unit of volume you want to use to measure the water, and then figure out how many of these units your quantity of water contains. All of the most common units of volume are included in Table 1 below.

Once you know the type of unit and the number of units, refer to the weight of your unit given in Table 1, and multiply the weight for one of those units by the number of units you have.

Next you need to adjust the weight to account for the temperature of the water.

The weights given in Table 1 are for water at maximum density, which water achieves at 39.2°F (or 4°C). The density of water changes with the temperature of the water, so the mass of a particular volume of water changes with the temperature as well, which means that the weight also changes.

Table 2 below shows water density by temperature, and the second column in the table shows the percentage of maximum density for each temperature. You can select your temperature and see what percentage of maximum density it is.

Since the weight value you got from table 1 is for maximum density, you can multiply the weight from Table 1 by the percentage from Table 2 to get the actual weight of the water you are concerned with.

Example:

How much does 100 gallons of water weigh at room temperature?

Step 1:

According to Table 1, a gallon of water weighs 8.34540 pounds at maximum density.

Step 2:

8.34540 x 100 = 834.54 pounds

100 gallons of water weighs 834.54 pounds at maximum density.

Step 3:

According to Table 2, the density of water at room temperature (70°F) is 99.802% of the density of water at 39.2°F (maximum density).

Multiply 834.54 pounds by 0.99802 to get 832.8876108 pounds, which we would round off to 832.89 pounds.

So 100 gallons of water weighs 832.89 pounds at room temperature.

Weight of Water by Unit of Volume

About This Table

The following table gives the weight of water per unit for all of the common measurement units used to measure liquid volume. The weight values provided are for pure water at maximum density, which occurs at 39.2° Fahrenheit or 4.0° Celsius.

Weight of water and temperature: Note that the density of water at room temperature will be 0.00198 g/cm³ less than water at its maximum density (see the next table below). We are assuming room temperature to be 70°F (21°C) for simplicity’s sake.

You can figure that the weight of water at room temperature for any specific volume will be approximately 99.8 percent of the weight of the same volume of water at 39.2°F (4.0°C). For example, a cubic foot of water at room temperature will weigh 62.3044 lbs., which is approximately 99.8% of the 62.4280 lbs. that a cubic foot of water weighs at 39.2°F (4.0°C)

We are aware that a mole of water is a specific number of water molecules and not a unit of volume but we thought we’d include it anyway.

We are also aware that a surprising number of people don’t realize that a fluid ounce is a unit of volume and not weight…

Table 1: Weight of Water by Unit of Volume

Weight of Water for All Common Units of Volume Measurement
(Weight of water at maximum density. Water is at maximum density at 39.2°F or 4°C.)
Unit of VolumeAbbreviationSame Volume in MillilitersWeight of Water in PoundsWeight of Water in OuncesWeight of Water in KilogramsWeight of Water in Grams
Centilitercl, cL10 mL0.02205 lb0.35274 oz0.01 kg10 g
Cubic Centimetercm³, cc, ccm1 mL0.00220 lb0.03527 oz0.001 kg1 g
Cubic Footft³, cu ft28,316.8 mL62.42786 lb998.84573 oz28.3168 kg28,316.8 g
Cubic Inchin³, cu in16.3871 mL0.03613 lb0.57804 oz0.01639 kg16.3871 g
Cubic Meter1,000,000 mL2,204.62 lb35,273.96 oz1,000 kg1,000,000 g
Cubic Yardyd³, cu yd764,555 mL1,685.56 lb26,968.88 oz764.555 kg764,555 g
Cup (Imperial)C, c284.131 mL0.62640 lb10.02243 oz0.28413 kg284.131 g
Cup (Metric)C, c250 mL0.55116 lb8.81849 oz0.25 kg250 g
Cup (U.S. Customary)C, c236.58824 mL0.52159 lb8.34540 oz0.23659 kg236.58824 g
Cup (U.S. Legal)C, c240 mL0.52911 lb8.46575 oz0.24 kg240 g
Deciliterdl, dL100 mL0.22046 lb3.5274 oz0.1 kg100 g
Drop (Pharm.)gt, gtt0.05 mL0.00011 lb0.00176 oz0.00005 kg0.05 g
Fluid Dram (U.S.)fl dr, fʒ3.69669 mL0.00815 lb0.13040 oz0.00370 kg3.69669 g
Fluid Ounce (U.S.)fl oz, f℥29.5735 mL0.06520 lb1.04317 oz0.02957 kg29.5735 g
Gallon (U.S.)gal3,785.41 mL8.34540 lb133.52641 oz3.78541 kg3,785.41 g
Half Gallon1/2 gal1892.71 mL4.17271 lb66.76338 oz1.89271 kg1892.71 g
Literl, L1,000 mL2.20462 lb35.274 oz1 kg1,000 g
Milliliter (ml)ml, mL1 mL0.00220 lb0.03527 oz0.001 kg1 g
Minim (U.S.)min, ♏︎0.06161 mL0.00014 lb0.00217 oz0.00006 kg0.06161 g
MolemolN.A.0.03972 lb0.63547 oz0.01802 kg18.01528 g
Pint (U.S.)pt, p473.176 mL1.04317 lb16.69079 oz0.47318 kg473.176 g
Quart (U.S.)qt946.353 mL2.08635 lb33.38162 oz0.94635 kg946.353 g
Tablespoon (U.S.)tbsp, T14.7868 mL0.03260 lb0.52159 oz0.01479 kg14.7868 g
Teaspoon (U.S.)tsp, t4.92892 mL0.01087 lb0.17386 oz0.00493 kg4.92892 g

Weight of Water by Temperature

Table 2: Density of Water by Temperature

Water Density by Temperature
Temperature
°F/°C
Density as Percentage of Maximum DensityPounds per
Cubic Foot
lb/ft³
Pounds per
Cubic Inch
lb/in³
Kilograms per
Cubic Meter
kg/m³
Grams per
Cubic Centimeter
g/cm³
32°F/0°C99.987%62.4198 lb/ft³0.03612 lb/in³999.87 kg/m³0.99987 g/cm³
39.2°F/4.0°C100%62.4280 lb/ft³0.03613 lb/in³1,000 kg/m³1.00000 g/cm³
40°F/4.4°C99.999%62.4273 lb/ft³0.03613 lb/in³999.99 kg/m³0.99999 g/cm³
50°F/10°C99.975%62.4124 lb/ft³0.03612 lb/in³999.75 kg/m³0.99975 g/cm³
60°F/15.6°C99.907%62.3699 lb/ft³0.03609 lb/in³999.07 kg/m³0.99907 g/cm³
70°F/21°C99.802%62.3044 lb/ft³0.03606 lb/in³998.02 kg/m³0.99802 g/cm³
80°F/26.7°C99.669%62.2213 lb/ft³0.03601 lb/in³996.69 kg/m³0.99669 g/cm³
90°F/32.2°C99.510%62.1221 lb/ft³0.03595 lb/in³995.10 kg/m³0.99510 g/cm³
100°F/37.8°C99.318%62.0022 lb/ft³0.03588 lb/in³993.18 kg/m³0.99318 g/cm³
120°F/48.9°C98.870%61.7225 lb/ft³0.03572 lb/in³988.70 kg/m³0.98870 g/cm³
140°F/60°C98.338%61.3904 lb/ft³0.03553 lb/in³983.38 kg/m³0.98338 g/cm³
160°F/71.1°C97.729%61.0102 lb/ft³0.03531 lb/in³977.29 kg/m³0.97729 g/cm³
180°F/82.2°C97.056%60.5901 lb/ft³0.03506 lb/in³970.56 kg/m³0.97056 g/cm³
200°F/93.3°C96.333%60.1387 lb/ft³0.03480 lb/in³963.33 kg/m³0.96333 g/cm³
212°F/100°C95.865%59.8466 lb/ft³0.03463 lb/in³958.65 kg/m³0.95865 g/cm³
How Much Does Water Weigh? Calculators, Charts & Guide (2)

About This Table

The table below provides the weight of water per inch in pounds for various areas/square footages.

This should allow you to quickly and accurately estimate the weight of any amount of standing water on your low slope roof.

One cubic inch of water weighs 0.036127 of a pound. One square foot of water one inch deep weighs 144 times this, or 5.202288 pounds. Everything else has been calculated from this.

This table should give you an idea of how much weight a rain load could be imposing on your roof due to areas of ponding water or clogged drains.

Also see our Roof Drainage page.

Weight of water values for areas or depths not covered in the table should be easy to arrive at simply by adding together values for areas or depths which are listed.

Table 3: Weight of Water per Inch per Square Foot

Weight of Water per Inch per Square Foot in Pounds
Depth of Water
in Inches
Surface Area of Water in Square Feet
1
Square Foot
2
Square Feet
3
Square Feet
5
Square Feet
10
Square Feet
20
Square Feet
30
Square Feet
50
Square Feet
100
Square Feet
500
Square Feet
1000
Square Feet
0.25 inch1.30
lbs.
2.60
lbs.
3.90
lbs.
6.50
lbs.
13.01
lbs.
26.01
lbs.
39.02
lbs.
65.03
lbs.
130.06
lbs.
650.29
lbs
1,300.57
lbs.
0.5 inch2.605.207.8013.0126.0152.0278.03130.06260.111,300.572,601.14
1 inch5.2010.4115.6126.0152.02104.05156.07260.11520.232,601.145,202.29
2 inches10.4120.8131.2152.02104.05208.09312.14520.231,040.465,202.2910,404.58
3 inches15.6131.2146.8278.03156.07312.14468.21780.341,560.697,803.4315,606.86
4 inches20.8141.6262.43104.05208.09416.18624.271,040.462,080.9210,404.5820,809.15
5 inches26.0152.0278.03130.06260.11520.23780.341,300.572,601.1413,005.7226,011.44
6 inches31.2162.4393.64156.07312.14624.28936.411,560.693,121.3715,606.8631,213.73
7 inches36.4272.83109.25182.08364.16728.321,092.481,820.803,641.6018,208.0136,416.02
8 inches41.6283.24124.86208.09416.18832.371,248.552,080.924,161.8320,809.1541,618.30
9 inches46.8293.64140.46234.10468.21936.411,404.622,341.034,682.0623,410.3046,820.59
10 inches52.02104.05156.07260.11520.231,040.461,560.692,601.145,202.2926,011.4452,022.88
11 inches57.23114.45171.68286.13572.251,144.501,716.762,861.265,722.5228,612.5857,225.17
12 inches62.43124.86187.28312.14624.281,248.551,873.043,121.376,242.7531,213.7362,427.46
24 inches124.86249.71374.57624.281,248.552,497.103,745.656,242.7512,485.4962,427.46124,854.91
36 inches187.28374.57561.85936.411,872.823,745.655,618.479,364.1218,728.2493,641.18187,282.37
48 inches249.71499.42749.131,248.552,497.104,994.207,491.2912,485.4924,970.98124,854.91249,709.82
60 inches312.14624.28936.411,560.693,121.376,242.759,364.1215,606.8631,213.73156,068.64312,137.28

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How Much Does Water Weigh? Calculators, Charts & Guide (2024)

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