Pond and Lake Calculator

Acreage Calculation

For acreage of a square or rectangle, multiply the Length (in feet) by Width (in feet) = Square Footage. Then divide Square Footage by 43,560 (amount of square feet in 1 acre) = Acreage.

Example: I have a rectangular pond that is 100' long by 50' wide. 100' x 50' = 5,000 square feet. Then 5,000 / 43,560 = 0.11 acres


For acreage of a circular area, multiply the Length (in feet) by Width (in feet) = Square Footage. Then multiply Square footage by 0.8 = Adjusted Square Footage. Finally divide your Adjusted Square Footage by 43,560 = Acreage (of circle).


Example: I have a circular pond that is 100' long by 100' wide. 100' x 100' = 10,000 square feet. Then 10,000 x 0.8 = 8,000 adjusted square feet. Finally, 8,000 / 43,560 = 0.18 acres

Volume Calculation

For acres per foot, multiply the Acreage by the Average Depth (in feet) = Acre/feet

Example: I have a 1.25 acre pond with a 6' average depth. 1.25 x 6' = 7.5 acre/feet.


For gallons, multiply acre-feet by 325,829 (gallons in 1 acre - foot) = Gallons.

Example: I have 7.5 acre-feet of water. 7.5 x 325,829 = 2,443,717 gallons.

Conversion Calculator

square units

cubic units

Circular Waterbody

Rectangular Waterbody

(use the same units for each measurement, i.e. all in inches or feet)

square units

cubic units

Area Conversion

acre [ac]:

square foot [ft2]:

square mile [mi2]:

hectare [ha]:

square kilometer:

square meter [m2]:

Volume Conversion

acre-foot [ac*ft]

cubic inch [in3]:

cubic foot [ft3]:

fluid ounce (US):

cup (US):

pint (UK) [pt (UK)]:

quart (US) [qt (US)]:

cc [cc, cm3]:

gallon (US) [gal (US)]:

liter [L, l]:

cubic meter [m3]:

Flow Conversion

cubic foot/second:

cubic foot/minute:

cubic foot/hour:




gallon (US)/second:

gallon (US)/hour:

gallon (US)/minute:

gallon (US)/day:

liter/second [L/s]:

liter/minute [L/min]:

liter/hour [L/h]:

cubic meter/minute:

liter/day [L/d]:

cubic meter/hour:

cubic meter/day:

cubic meter/second: