Yield Calculator - HPS Lamps
Click here for the Metal Halide Calculator

Choose Your Growing Scenario
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Select a High Pressure Sodium lamp (scenarios are for single lamp gardens)
Select a light intensity (determines canopy space)
Select a level of growing experience (use the default if you've never grown or researched indoor cultivation)
If you don't use hydroponic media change the default to non-hydro medium
Optionally change defaults for your target production settings
Click any ReCalc button to refresh the totals (a custom report is generated each time)

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Crop Yield

Grams
Ounces
Pounds

Grams per Square Foot
Grams per kilolumen

Space

Canopy Square Feet

Light

Total HPS Lumens

Self-sufficiency Planner
Synchronizes consumption, production, veg time and maturity time

Target Production Settings
Select your daily cannabis consumption
Select a Veg time if different from the 3 Week default. Or select No Veg Time if you plan to use a high enough number of plants to bypass a veg phase in your single grow area, or veg concurrently in a second grow area.
Adjust your rainy day safety margin (surplus)
Please choose a growing scenario before using the planner

Annual Target & Consumption Projection
	Grams	Ounces	Pounds
Target Production (incl. safety margin)
Consumption

Workload & Time Frame (to meet annual Target Production)
Days Spent Growing Crops	Strain Maturity Time (Days Flowering)	Crops Grown Annually
	40
	50
	60
	Current 63 Scenario
	70
	80
	90
	100

Days Spent Growing Crops

Greater than 365: you will not meet your annual target (readjust your target settings or growing scenario).

Exactly 365: you will meet your annual target, growing continuous back-to-back crops for the entire year.

Less than 365: you will meet your annual target, growing intermittently with some free time between crops.

Based only on your daily consumption and growing scenario's crop yield, a single crop would produce a day supply of cannabis. However, in order to replenish your supply as it runs out over time, your crop yield, veg time and maturity time for the strain you use needs to be synchronized with your target production. The first table shown above projects your annual consumption and target production (target production is your annual consumption plus the selected safety margin).

The second table uses your target production, 63-day crop yield, veg time and, in conjunction with a list of other strain maturity times, estimates how many crops and how long it will take for each in the list to meet your target production. Consult the notes above for interpreting days spent growing crops. Crop numbers have been rounded up to the next integer so that all crops can be counted as consumable, fully matured crops. To see the numbers before rounding click the Fractional Crops button, but be aware that a fraction of a crop (0.5) cannot be consumed until the crop has fully matured (use at your own discretion).

Maturity times for many cannabis strains can be found at
The Seedbank Update web site (listed by strain)
Strainguide archives (listed by seedbank)

Tips for finding a niche that fits your schedule & life style

Growing Scenario - A growing scenario that produces more crop yield has a powerful global affect on your workload, and is by far the best way to reduce both the number of crops grown and the number of days it takes to meet your target. If minimizing your workload and time in the grow room is important to you, don't scrimp on the crop yield produced by your growing scenario.
Veg Time - Veg time will not affect the number of crops needed to meet your target, but will affect the total number of days each crop needs to be grown. Given the same strain maturity time, longer veg times usually require fewer plants.
Safety Margin - This will affect both the number of crops and days spent growing. The effect is the percentage difference in the change you make. For example, changing from 15% to 0% will reduce your Target Production by 15%. However, keep in mind that with no safety margin you may have no surplus to draw from in the event of a poorly producing crop.
Crops Grown - The number of crops needed to meet your Annual Target Production. Each crop requires the same duties and chores to be repeated by the grower, such as media replacement, plant replacements, reservoir changes and between-crop clean up. Costs would be repeated as well. A higher number implies a degree of extra work, time and expense not reflected in the days spent growing crops. Those interested in minimizing their workload and time in the grow room would want to seriously consider the number of repeat crops as well as the days spent growing them.

Yield Calculator - HPS Lamps Click here for the Metal Halide Calculator

Yield Calculator - HPS Lamps
Click here for the Metal Halide Calculator