Appendices: Appendix M. The Metric System

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Pub 811: Agronomy Guide > Appendices > Appendix M. The Metric System

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• Metric Units
• Application Rate Conversions
• Dry Weight Equivalents
• Liquid Equivalents
• Speed
• Abbreviations
• Conversion Tables - Metric to Imperial
• Conversion Tables - Imperial to Metric

Metric Units

Linear Measures (length)

10 millimetres (mm) = 1 centimetre (cm)
100 centimetres (cm) = 1 metre (m)
1,000 metres (m) = 1 kilometre (km)

Square Measures (area)

100 m x 100 m = 10,000 m² = 1 hectare (ha)
100 hectares = 1 square kilometre (km²)

Cubic Measures (volume)

Dry Measure

1,000 cubic millimetres (mm³) = 1 cubic centimetre (cm³)
1,000,000 cubic centimetres (cm³) = 1 cubic metre (m³)

Liquid Measure

1,000 millilitres (mL) = 1 litre (L)
100 litres (L) = 1 hectolitre (hL)

Weight-Volume Equivalents (for water)

(1.00 kg) 1,000 grams = 1 litre (1.00 L)
(0.50 kg) 500 grams = 500 millilitres (0.50 L)
(0.10 kg) 100 grams = 100 millilitres (0.10 L)
(0.01 kg) 10 grams = 10 millilitres (0.01 L)
(0.001 kg) 1 grams = 1 millilitre (0.001 L)

Weight Measures

1,000 milligrams (mg) = 1 gram (g)
1,000 grams (g) = 1 kilogram (kg)
1,000 kilograms (kg) = 1 tonne (t)
1 milligram/kilogram = 1 part per million (ppm)

Dry Liquid Equivalents

1 cubic centimetre (cm³) = 1 millilitre (mL)
1 cubic metre (m³) = 1,000 litres (L)

Application Rate Conversions

Metric to Imperical or US (Approximate)

litres per hectare x 0.09 = gallons per acre
litres per hectare x 0.11 = US gallons per acre
litres per hectare x 0.36 = quarts per acre
litres per hectare x 0.36 = US quarts per acre
litres per hectare x 0.71 = pints per acre
litres per hectare x 0.86 = US pints per acre
millilitres per hectare x 0.015 = fluid ounces per acre
grams per hectare x 0.015 = ounces per acre
kilograms per hectare x 0.89 = pounds per acre
tonnes per hectare x 0.45 = tons per acre

Imperial or US to Metric (Approximate)

gallons per acre x 11.23 = litres per hectare (L/ha)
gallons US per acre x 9.35 = litres per hectare (L/ha)
quarts per acre x 2.8 = litres per hectare (L/ha)
quarts US per acre x 2.34 = litres per hectare (L/ha)
pints per acre x 1.4 = litres per hectare (L/ha)
pints US per acre x 1.17 = litres per hectare (L/ha)
fluid ounces per acre x 70 = millilitres per hectare (mL/ha)
fluid ounces US per acre x 73 = millilitres per hectare (mL/ha)
tons per acre x 2.24 = tonnes per hectare (t/ha)
pounds per acre x 1.12 = kilograms per hectare (kg/ha)
pounds per acre x 0.45 = kilograms per acre (kg/acre)
ounces per acre x 70 = grams per hectare (g/ha)

Fertililizer Conversions

K₂O x 0.83 = K (elemental)
P₂O₅ x 0.44 = P (elemental)
Phosphorus (P) x 2.29 = P₂O₅
Potash (K₂O) x 0.83 = Potassium (K)
Potassium (K) x 1.2 = Potash (K₂O)

Metric Conversion

5 mL = 1 tsp
15 mL = 1 tbsp
28.5 mL = 1 fl. oz

Dry Weight Equivalents

Metric	Imperial
100 grams/hectare (g/ha) =	1½ ounces/acre (oz/acre)
200 grams/hectare (g/ha) =	3 ounces/acre (oz/acre)
300 grams/hectare (g/ha) =	4¼ ounces/acre (oz/acre)
500 grams/hectare (g/ha) =	7 ounces/acre (oz/acre)
700 grams/hectare (g/ha) =	10 ounces/acre (oz/acre)
1.10 kilograms/hectare (kg/ha) =	1 pound/acre (lb/acre)
1.50 kilograms/hectare (kg/ha) =	1¼ pounds/acre (lb/acre)
2.00 kilograms/hectare (kg/ha) =	1-3/4 pounds/acre (lb/acre)
2.50 kilograms/hectare (kg/ha) =	2¼ pounds/acre (lb/acre)
3.25 kilograms/hectare (kg/ha) =	3 pounds/acre (lb/acre)
4.00 kilograms/hectare (kg/ha) =	3½ pounds/acre (lb/acre)
5.00 kilograms/hectare (kg/ha) =	4½ pounds/acre (lb/acre)
6.00 kilograms/hectare (kg/ha) =	5¼ pounds/acre (lb/acre)
7.50 kilograms/hectare (kg/ha) =	6-3/4 pounds/acre (lb/acre)
9.00 kilograms/hectare (kg/ha) =	8 pounds/acre (lb/acre)
11.00 kilograms/hectare (kg/ha) =	10 pounds/acre (lb/acre)
13.00 kilograms/hectare (kg/ha) =	11½ pounds/acre (lb/acre)
15.00 kilograms/hectare (kg/ha) =	13½ pounds/acre (lb/acre)

 

Liquid Equivalents

Litres/Hectare	Approximate Gallons/Acre
50 =	5
100 =	10
150 =	15
200 =	20
250 =	25
300 =	30

 

Speed

miles per hour x 88 = feet per minute
miles per hour x 1.467 = feet per second
miles per minute x 88 = feet per second
feet per minute x 0.01667 = feet per second
feet per minute x 0.01136 = miles per hour
feet per second x 18.288 = metres per minute
feet per second x 0.3048 = metres per second
feet per second x 1.09728 = kilometres per hour
centimetres per second x 1.968504 = feet per minute
centimetres per second x 0.0328084 = feet per second
centimetres per second x 0.02236936 = miles per hour
kilometres per hour x 27.777778 = centimetres per second
kilometres per hour x 3280.8399 = feet per hour
kilometres per hour x 54.680665 = feet per minute
kilometres per hour x 0.6213712 = miles per hour
miles per hour x 1.6093439 = kilometres per hour

Abbreviations

% = per cent (by weight)
ai = active ingredient
AP = agricultural powder
cm = centimetre
cm² = square centimetre
DG - dispersible granular
DP = dispersible powder
E = emulsifiable
e.g. = for example
EC = emulsifiable concentrate
F = flowable
g = gram
Gr = granules, granular
ha = hectare
kg = kilogram
km/h = kilometres per hour
kPa = kilopascal
L = litre
m = metre
m/sec = metres per second
m² = square metre
mL = millilitre
mm = millimetre
SC = sprayable concentrate
SP = soluble powder
t = tonne
W = wettable (powder)
WDG = water dispersible granular
WP = wettable powder
km/h = kilometres per hour

Conversion Tables - Metric to Imperial

Length

1 millimetre (mm) = 0.04 inch (in.)
1 centimetre (cm) = 0.40 inch (in.)
1 metre (m) = 39.40 inches (in.)
1 metre (m) = 3.28 feet (ft)
1 metre (m) = 1.09 yards (yd)
1 kilometre (km) = 0.62 mile (mi)

Area

1 square centimetre (cm²) = 0.16 square inch (in2)
1 square metre (m²) = 10.77 square feet (ft²)
1 square metre (m²) = 1.20 square yards (yd²)
1 square kilometre (km²) = 0.39 square mile (mi²)
1 hectare (ha) = 107,636 square feet (ft²)
1 hectare (ha) = 2.5 acres (acre)

Volume (dry)

1 cubic centimetre (cm³) = 0.061 cubic inch (in.³)
1 cubic metre (m³) = 1.31 cubic yards (yd³)
1 cubic metre (m³) = 35.31 cubic feet (ft³)
1,000 cubic metres (m³) = 0.81 acre-foot
1 hectolitre (hL) = 2.8 bushels (bu)

Volume (liquid)

1 millilitre (mL) = 0.035 fluid ounce (Imp)
1 litre (L) = 1.76 pints (Imp)
1 litre (L) = 0.88 quart (Imp)
1 litre (L) = 0.22 Imperial gallons (gal)
1 litre (L) = 0.26 U.S. gallon (U.S. gal)

Weight

1 gram (g) = 0.035 ounce (oz.)
1 kilogram (kg) = 2.21 pounds (lb)
1 tonne (t) = 1.10 short tons
1 tonne (t) = 2,205 pounds (lb)

Pressure

1 kilopascal (kPa) = 0.15 pounds/square inch (lb/in.²)

Speed

1 metre per second (m/sec) = 3.28 feet per second (ft/sec)
1 metre per second (m/sec) = 2.24 miles per hour (mph)
1 kilometre per hour (km/h) = 0.62 mile per hour (mph)

Temperature

°F = (°C x 9/5) + 32

 

Conversion Tables - Imperial to Metric

Length

1 inch (in) = 2.54 centimetres (cm)
1 foot (ft) = 0.30 metre (m)
1 yard (yd) = 0.91 metre (m)
1 mile (mi) = 1.61 kilometre (km)

Area

1 square foot (ft²) = 0.09 square metres (m²)
1 square yard (yd²) = 0.84 metre (m²)
1 acre (ac) = 0.40 hectare (ha)

Volume (dry)

1 cubic yard (yd³) = 0.76 cubic metre (m³)
1 bushel (bu) = 36.37 litres (L)

Volume (liquid)

1 fluid ounce (Imp.) = 28.41 millilitres (mL)
1 pint (Imp.) = 0.57 litre (L)
1 gallon (Imp.) = 4.55 litres (L)
1 gallon (U.S.) = 3.79 litres (L)

Weight

1 ounce (oz) = 28.35 grams (g)
1 pound (lb) = 453.6 grams (g)
1 ton = 0.91 tonne (t)

Pressure

1 pound per square inch (lb/in2) = 6.90 kilopascals (kPa)

Temperature

°C = (°F-32) x 5/9