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Weights and Measures: Converting Garden Measurements

By Eric Hopper
Published: March 11, 2022
Key Takeaways

Not great at converting imperial to metric and vice versa? Don’t worry. Like that good buddy who helped you cheat your way through math class, Eric Hopper has done the work for you.

The planning, building, and maintaining of an indoor garden requires a variety of calculations. Although it would be simple and straightforward to have one system of measurement, the U.S. remains the only industrialized country in the world that uses the imperial system as its main system of measurement. It is important for indoor gardeners to be able to convert from imperial to metric and vice versa because fertilizer, lighting, ventilation, and HVAC companies may use different measurement systems for their recommendations. Below are a series of conversion charts that indoor growers can use to make conversions between imperial and metric systems.

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Capacity Measure (Liquid Volume)

Conversions for liquid volume measurements will help growers with fertilizer dosage, pesticide dilution, hydroponic reservoir capacities, and other irrigation-related measurements.

IMPERIAL

METRIC

1 US liquid teaspoon

4.92 ml

1 US liquid Tablespoon

14.78 ml

1 (US liquid) fl. oz. (1/16 US pint)

29.57 ml

1 (US liquid) gill (1/4 US pint)

118.29 ml

1 (US liquid) pint (16 fl. US oz.)

473.18 ml

1 (US Liquid) quart (32 fl. US oz)

946.35 ml

1 (US liquid) gallon (4 quarts)

4.546 liters


METRIC

IMPERIAL

1 millilitre

0.002 (imperial) pint

1 centilitre (10 ml)

0.018 pint

1 deciliter (100 ml)

0.176 pint

1 litre (1000 ml)

1.76 pints


Mass (Weight)

Weight or mass conversions can be used by horticulturists for more accurate dry fertilizer dosage and figuring the dry weight of culinary herbs or produce.

IMPERIAL

METRIC

1/16 ounce (1 dram)

1.772 grams

1/8 ounce (2 dram)

3.544 grams

1/4 ounce (4 dram)

7.087 grams

1/2 ounce (8 dram)

14.17 grams

1 ounce (16 drams)

28.35 grams

1 pound (16 ounces or 7,000 grains)

0.453 kilogram


METRIC

IMPERIAL

1 milligram

0.015 grain

1 gram (1,000 mg)

15.43 grain

1 hectogram (100 g)

3.527 ounces

1 kilogram (1,000 g)

2.205 pounds

1 tonne (1,000 kg)

0.984 ton



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Temperature

Indoor growers can use the following temperature conversions to convert Fahrenheit to Celsius and vice versa. Growroom temperatures are important to horticulturists, but those who make plant extracts also need precise temperatures.

To convert from Fahrenheit to Celsius, subtract 32, then multiply by 0.5556 (or 5/9).
To convert from Celsius to Fahrenheit, multiply by 1.8 (or 9/5), then add 32.

FAHRENHEIT

CELSIUS

5 degrees

-15 degrees

10 degrees

-12 degrees

25 degrees

-4 degrees

32 degrees

0 degrees

50 degrees

10 degrees

100 degrees

37 degrees

200 degrees

93 degrees

212 degrees

100 degrees

250 degrees

121 degrees

300 degrees

150 degrees

325 degrees

160 degrees

350 degrees

180 degrees

400 degrees

200 degrees


Length/Distance

Length/distance and area are useful for setting up an indoor growroom, calculating artificial lighting needs, and/or determining the area of an outdoor garden or farm.

IMPERIAL

METRIC

1 inch

25.4 millimeters

1 foot (12 inches)

0.3048 meter

1 yard (3 feet)

0.9144 meter


METRIC

IMPERIAL

1 millimeter

0.0394 inch

1 centimeter (10 mm)

0.3937 inch

1 decimeter (10 cm)

3.937 inches

1 meter (100 cm)

1.0936 yards

1 decameter (10 m)

10.936 yards


Area (Square Measure)

IMPERIAL

METRIC

1 square inch

6.4516 sq. centimeters

1 square foot (144 square inches)

9.29 square decimeters

1 square yard (9 square feet)

0.8361 square meters

1 acre (4,840 square yards)

0.40469 hectare

1 square mile (640 acres)

259 hectares


METRIC

IMPERIAL

1 square centimeter

0.1550 sq. inch

1 square meter (10,000 sq. cm)

1.1960 sq. yards

1 hectare

2.4711 acres

1 square kilometer

0.3861 sq. mile


Cubic Measure (Volume)

For indoor growers, understanding the cubic measure of a grow space is imperative for ventilation. Calculating loads for intake, exhaust, and HVAC equipment will all require cubic measurements along with other variables.

IMPERIAL

METRIC

1 cubic foot (1,728 cubic inches)

0.0283 cubic meters

1 cubic yard (27 cubic feet)

0.765 cubic meters


METRIC

IMPERIAL

1 cubic meter (one million cu. cm)

1.308 cubic yards


Indoor horticulturists who can convert from imperial to metric will be able to quickly and accurately take important measurements in their growrooms. From fertilizing to calculating lighting for an area to knowing the cubic volume of a space for ventilation, indoor growers are constantly taking measurements that will affect the performance of their gardens. Those who can accurately convert these measurements based on manufacturer recommendations will be that much more successful.

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Written by Eric Hopper | Writer, Consultant, Product Tester

Profile Picture of Eric Hopper

Eric Hopper’s past experiences within the indoor gardening industry include being a hydroponic retail store manager and owner. Currently, he works as a writer, consultant and product tester for various indoor horticulture companies. His inquisitive nature keeps him busy seeking new technologies and methods that could help maximize a garden’s performance.

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