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GreenPlanet Nutrient Calculator

Choose your Feed Program

Using our Nutrient Calculator is simple. Begin by choosing the Feed Program you are using. Enter in the volume of your reservoir in Litres. If you are not using reverse osmosis (RO) water or rain water for your water supply, choose 'Your Water' as your water supply. Measure and enter in the EC of your water supply. Our nutrient calculator will adjust the values using your settings.

The water type will affect the amount of base nutrients that are required. When using RO (Reverse Osmosis) water or rain water, it is recommended to include ProCal in your nutrient program. If you are using water other than RO or Rain Water, choose Your Water below, and then measure the EC of of your water supply and enter it in.

EC variance relative to water temperature

Temperature (deg C) EC (rel to 25 ℃) EC variance vs EC at 25 ℃
30
1.1
10%
29
1.08
8%
28
1.06
6%
27
1.04
4%
26
1.02
2%
25
1.00
0%
24
0.98
-2%
23
0.96
-4%
22
0.94
-6%
21
0.92
-8%
20
0.90
-10%
19
0.88
-12%
18
0.86
-14%
17
0.84
-16%
16
0.82
-18%
15
0.80
-20%

Note all EC measurements were taken at 18℃

Useful Conversions

Measures
 

Useful Conversions
1 tsp
5 mL
1 tbsp
15 mL
1 oz
30 mL
1 qt
946 mL
1 L
1000 mL
1 gal (US)
3.875 L
1 gal (US)
128 oz
1 gal (AU)
4.546 L

EC Conversion Chart

EC
ms/cm
CF ppm 500
TDS
ppm 700
(ECx700)
0.2
2
100
140
0.4
4
200
280
0.6
6
300
420
0.8
8
400
560
1
10
500
700
1.2
12
600
840
1.4
14
700
980
1.6
16
800
1120
1.8
18
900
1260
2
20
1000
1400
2.2
22
1100
1540
2.4
24
1200
1680
2.6
26
1300
1820
2.8
28
1400
1960
3
30
1500
2100
3.2
32
1600
2240
3.4
34
1700
2380
3.6
36
1800
2520