Garden calculators
Handy online conversions and charts for all your planting needs.

Spacing  10 sq. ft.  15 sq. ft.  25 sq. ft.  50 sq. ft.  100 sq. ft. 
5" x 6"  48  72  120  240  480 
5" x 8"  36  54  90  180  360 
6" x 6"  40  60  100  200  400 
6" x 7"  34  51  86  171  343 
6" x 8"  30  45  75  150  300 
7" x 8"  26  39  65  130  260 
8" x 8"  23  34  57  113  225 
8" x 9"  20  30  50  100  200 

1 (one) lb. of bluegrass will cover  667 sq. ft. 
1 (one) lb. of common mixed seed
(40% Kentucky bluegrass, 40% creeping red fescue,
20% perennial ryegrass) will cover  200 sq. ft. 
1 (one) lb. of perennial rye will cover  143 sq. ft. 
1 (one) lb. of Chewings fescue will cover  286 sq. ft. 
1 (one) lb. of Colonial bent will cover  2000 sq. ft. 
1 (one) lb. of creeping bent will cover  2000 sq. ft. 



Spaced 4" apart will cover  11 sq. ft. 
Spaced 6" apart will cover  25 sq. ft. 
Spaced 8" apart will cover  44 sq. ft. 
Spaced 10" apart will cover  70 sq. ft. 
Spaced 12" apart will cover  100 sq. ft. 
Spaced 15" apart will cover  156 sq. ft. 
Spaced 18" apart will cover  225 sq. ft. 
Spaced 24" apart will cover  400 sq. ft. 
Spacing is figured centre to centre. 

Gallons per minute  Cubic feet per minute  Gallons per hour  Gallons per 24 hr.  Acre ft. per 24 hr. 
100  13.37  6000  144,000  .44 
200  26.74  12,000  288,000  .88 
300  40.10  18,000  432,000  1.32 
500  66.80  30,000  720,000  2.20 
900  120.30  54,000  1,296,000  3.96 
All above numbers for the water conversion chart are based on standard industry U.S. gallon calculations. The following conversion factors can be used if necessary:
1 U.S. gal.= .833 Imperial gal.
1 Imperial gal. = 1.201 U.S. gal.
1 U.S. gal. = 3.785 litres
1 litre = .264 U.S. gal.
