---
title: "Sea of Green Calculator: Plant Density, Canopy Yield, and the Hidden Cost of the SCROG Veg Trap"
canonical: "https://theyieldgrid.com/sea-of-green-calculator/"
model_id: "tyg-749"
model_version: "1.0.0"
last_reviewed: "2026-08-25T01:29:41"
reviewed_by: "Umer Hayiat"
---

# Sea of Green Calculator: Plant Density, Canopy Yield, and the Hidden Cost of the SCROG Veg Trap

> Canonical calculator: [https://theyieldgrid.com/sea-of-green-calculator/](https://theyieldgrid.com/sea-of-green-calculator/)

## What this calculator does

Home - Free Gardening Calculators & Tools - Sea of Green Calculator: Plant Density, Canopy Yield, and the Hidden Cost of the SCROG Veg Trap Plant count is not the bottleneck in indoor growing. Canopy coverage is. A single plant spread across a 4×4 screen and sixteen plants squeezed into the same footprint can produce identical yields on paper, but the time, electricity, and operational complexity to get there are radically different. The variable that most online guides skip is the vegetative electricity load: the wattage your lights burn for weeks before a single flower develops.

## Inputs

| Input | ID | Type | Unit | Range or choices | Required |
|---|---|---|---|---|---|
| Tent Length (ft) | `pdye_length` | number | ft | 1 to 50 | No |
| Tent Width (ft) | `pdye_width` | number | ft | 1 to 50 | No |
| Grow Style | `pdye_style` | select | ft | — Select Style — = ``; SOG — Sea of Green (many small plants) = `sog`; SCROG — Screen of Green (few large plants) = `scrog` | No |
| Target Yield (g/sq ft) | `pdye_targetYield` | number | g/sq ft | 10 to 300 | No |
| Total Grow Light Wattage (W) | `pdye_watts` | number | W | 50 to 10000 | No |

## Outputs

| Output ID | Default state |
|---|---|
| `pdye_results` | Your Grow Results Canopy Area — sq ft — Est. Total Yield — g — Grams per Watt — g/W — Grow Performance Breakdown ⚡ Hidden Veg Electricity Cost (per cycle) Warnings & Standards Reference: Yield by Canopy Size (at your g/sq ft target) Canopy Size Style Plant Count Est. Yield @ 600W (g/W) Recommended Equipment |
| `pdye_out_area` | — |
| `pdye_out_yield` | — |
| `pdye_out_gpw` | — |
| `pdye_warnings_section` | Warnings & Standards |

## Formula and method

Show the calculation steps Canopy Area (sq ft) = Length x Width Straightforward multiplication. Both inputs are in feet; the result is square feet. Rounding rule: display to one decimal place. Plant Count Range SOG: minimum = Area x 2.0, maximum = Area x 4.0. SCROG: minimum = Area x 0.25, maximum = Area x 1.0. Results are rounded up to whole plants using ceiling rounding, since a partial plant slot requires a full plant. The midpoint of the range is displayed as the recommended count. Estimated Yield (g) = Canopy Area x Target Yield (g/sq ft) Rounded to the nearest whole gram. Ounce conversion: grams divided by 28.35, displayed to one decimal place. Grams per Watt = Estimated Yield / Total Wattage Displayed to two decimal places. This is a planning ratio, not an efficiency score from measured data. Veg Electricity Cost ($) = (Watts / 1000) x 18 x Veg Days x $0.13 SOG veg days = 14. SCROG veg days = 56. Rate used = $0.13/kWh (US average as of calculation date). Displayed to two decimal places. Both SOG and SCROG costs are computed regardless of which style is selected, enabling direct comparison. Light Coverage (W/sq ft) = Total Watts / Canopy Area Displayed to one decimal place. Threshold bands: below 20 W/sq ft triggers a danger flag; 20 to 30 triggers a caution; 30 to 50 is optimal; above 50 triggers a light-burn warning. Assumptions and Limits The yield estimate assumes 100% canopy fill. Sparse coverage, uneven training, or dead zones in the light footprint reduce actual yield without changing the calculation. g/W uses total fixture wattage, not wall draw adjusted for driver losses or heat load. Actual wall draw may be 5 to 15 W higher per fixture than the rated output. The electricity cost calculation assumes a constant $0.13/kWh. Rates vary significantly by region and time-of-use tariff. Adjust mentally for your actual rate. SOG veg period is assumed at 14 days. Some cultivars require 10 days; others need 21. SCROG veg is assumed at 56 days (8 weeks). Large canopies or slow-growing genetics may require 10 to 12 weeks. Plant density ranges are based on standard indoor photoperiod cultivation. Autoflowering strains are typically run at lower density and may not follow these ranges. This tool does not model multi-layer or vertical growing systems where canopy area and light footprint interact differently. Ounce conversion uses 28.35 g/oz (dry weight standard). Wet weight at harvest will be significantly higher. The tool does not account for nutrient costs, substrate costs, or labor. Electricity is one variable in the full cycle cost picture.

## Verified worked examples

### Example 1: Standard 4×4 SOG with 600W LED

Tent Length: 4 ft Tent Width: 4 ft Grow Style: SOG Target Yield: 50 g/sq ft Total Wattage: 600 W Result: Canopy area = 16 sq ft. Estimated yield = 800 g (28.2 oz). g/W = 1.33. Plant range = 32 to 64. SOG veg electricity cost = $19.66. W/sq ft = 37.5 (optimal range). This setup clears the 1.0 g/W LED benchmark comfortably. With 37.5 W/sq ft of light coverage, the canopy is well within the 30 to 50 W/sq ft optimal band. SOG allows a flip after approximately 14 days of veg at a total vegetative electricity cost under $20.

### Example 2: 4×8 SCROG with 1000W LED

Tent Length: 4 ft Tent Width: 8 ft Grow Style: SCROG Target Yield: 60 g/sq ft Total Wattage: 1000 W Result: Canopy area = 32 sq ft. Estimated yield = 1,920 g (67.7 oz). g/W = 1.92. Plant range = 8 to 32. SCROG veg electricity cost = $130.56. W/sq ft = 31.25 (acceptable). The g/W outcome looks strong, but the full picture includes $130.56 in electricity burned over 56 days of 18-hour veg before a single flower site initiates. SOG at the same wattage and yield target would reach the same harvest weight while spending $32.76 on veg electricity, saving $97.80 per cycle.

### Example 3: 3×3 SOG with 400W LED, Conservative Yield Target

Tent Length: 3 ft Tent Width: 3 ft Grow Style: SOG Target Yield: 40 g/sq ft Total Wattage: 400 W Result: Canopy area = 9 sq ft. Estimated yield = 360 g (12.7 oz). g/W = 0.90. Plant range = 18 to 36. SOG veg cost = $13.10. W/sq ft = 44.4 (optimal). At 0.90 g/W, this setup sits just below the 1.0 g/W LED benchmark. The light intensity is well-matched to the canopy at 44.4 W/sq ft, so the efficiency gap comes from the conservative 40 g/sq ft yield target. Raising the target to 45 g/sq ft or upgrading to a 450W fixture would push g/W to 1.0 without changing anything else.

## Assumptions

Tent Length: 4 ft Tent Width: 4 ft Grow Style: SOG Target Yield: 50 g/sq ft Total Wattage: 600 W Result: Canopy area = 16 sq ft. Estimated yield = 800 g (28.2 oz). g/W = 1.33. Plant range = 32 to 64. SOG veg electricity cost = $19.66. W/sq ft = 37.5 (optimal range). This setup clears the 1.0 g/W LED benchmark comfortably. With 37.5 W/sq ft of light coverage, the canopy is well within the 30 to 50 W/sq ft optimal band. SOG allows a flip after approximately 14 days of veg at a total vegetative electricity cost under $20. Show the calculation steps Canopy Area (sq ft) = Length x Width Straightforward multiplication. Both inputs are in feet; the result is square feet. Rounding rule: display to one decimal place. Plant Count Range SOG: minimum = Area x 2.0, maximum = Area x 4.0. SCROG: minimum = Area x 0.25, maximum = Area x 1.0. Results are rounded up to whole plants using ceiling rounding, since a partial plant slot requires a full plant. The midpoint of the range is displayed as the recommended count. Estimated Yield (g) = Canopy Area x Target Yield (g/sq ft) Rounded to the nearest whole gram. Ounce conversion: grams divided by 28.35, displayed to one decimal place. Grams per Watt = Estimated Yield / Total Wattage Displayed to two decimal places. This is a planning ratio, not an efficiency score from measured data. Veg Electricity Cost ($) = (Watts / 1000) x 18 x Veg Days x $0.13 SOG veg days = 14. SCROG veg days = 56. Rate used = $0.13/kWh (US average as of calculation date). Displayed to two decimal places. Both SOG and SCROG costs are computed regardless of which style is selected, enabling direct comparison. Light Coverage (W/sq ft) = Total Watts / Canopy Area Displayed to one decimal place. Threshold bands: below 20 W/sq ft triggers a danger flag; 20 to 30 triggers a caution; 30 to 50 is optimal; above 50 triggers a light-burn warning. Assumptions and Limits The yield estimate assumes 100% canopy fill. Sparse coverage, uneven training, or dead zones in the light footprint reduce actual yield without changing the calculation. g/W uses total fixture wattage, not wall draw adjusted for driver losses or heat load. Actual wall draw may be 5 to 15 W higher per fixture than the rated output. The electricity cost calculation assumes a constant $0.13/kWh. Rates vary significantly by region and time-of-use tariff. Adjust mentally for your actual rate. SOG veg period is assumed at 14 days. Some cultivars require 10 days; others need 21. SCROG veg is assumed at 56 days (8 weeks). Large canopies or slow-growing genetics may require 10 to 12 weeks. Plant density ranges are based on standard indoor photoperiod cultivation. Autoflowering strains are typically run at lower density and may not follow these ranges. This tool does not model multi-layer or vertical growing systems where canopy area and light footprint interact differently. Ounce conversion uses 28.35 g/oz (dry weight standard). Wet weight at harvest will be significantly higher. The tool does not account for nutrient costs, substrate costs, or labor. Electricity is one variable in the full cycle cost picture. The yield estimate assumes 100% canopy fill. Sparse coverage, uneven training, or dead zones in the light footprint reduce actual yield without changing the calculation. g/W uses total fixture wattage, not wall draw adjusted for driver losses or heat load. Actual wall draw may be 5 to 15 W higher per fixture than the rated output. The electricity cost calculation assumes a constant $0.13/kWh. Rates vary significantly by region and time-of-use tariff. Adjust mentally for your actual rate. SOG veg period is assumed at 14 days. Some cultivars require 10 days; others need 21. SCROG veg is assumed at 56 days (8 weeks). Large canopies or slow-growing genetics may require 10 to 12 weeks. Plant density ranges are based on standard indoor photoperiod cultivation. Autoflowering strains are typically run at lower density and may not follow these ranges. This tool does not model multi-layer or vertical growing systems where canopy area and light footprint interact differently. Ounce conversion uses 28.35 g/oz (dry weight standard). Wet weight at harvest will be significantly higher. The tool does not account for nutrient costs, substrate costs, or labor. Electricity is one variable in the full cycle cost picture. Critical Warnings Our calculator exposes the hidden "electricity trap" by comparing the 14-day and 56-day vegetative power requirements. The SCROG Veg Electricity Trap: A 4×4 tent running a 600W LED on an 8-week SCROG veg consumes approximately 78 kWh before the first day of flower. At $0.13/kWh, that is $78.62 in electricity for vegetative growth alone, plus 56 days of calendar time. The same wattage, same canopy, and the same yield target under SOG completes its veg cycle in 14 days for $19.66. The tool surfaces this number explicitly because most yield calculators treat veg electricity as zero. Cloning Capacity Bottleneck in High-Density SOG: A 4×4 tent at maximum SOG density requires 64 plants. Continuous SOG cycling demands a permanent cloning pipeline. Without an aeroponic or propagation system capable of producing clones on a 14-day rotation, the SOG veg advantage collapses into irregular harvest gaps. Plant count at the high end of the density range is only sustainable with active clone production. Below 0.5 g/W: A Lighting Problem, Not a Technique Problem: If the calculator returns a g/W below 0.5, the issue is almost always a mismatch between light output and canopy size, not grow style or plant count. Swapping SOG for SCROG will not fix an under-lit canopy. The correct fix is to reduce the canopy footprint or increase fixture wattage. Light Intensity Above 50 W/sq ft: The tool flags this as a caution zone. While high-intensity LEDs can support above 50 W/sq ft with CO2 supplementation and precise vapor pressure deficit management, without those environmental controls, light intensities in this range risk photo-bleaching at the top of the canopy and uneven penetration below. Minimum Standards Minimum g/W threshold for LED: 1.0 g/W. Below 0.75 g/W warrants a lighting audit before the next cycle. Minimum light coverage: 30 W/sq ft. Below this level, canopy penetration is insufficient for dense SOG fills. SOG minimum veg duration: enough time for the canopy to fill the footprint, typically 10 to 21 days depending on plant size at transplant and cultivar growth rate. SCROG net should be set at 20 to 30 cm above the container tops to allow adequate branching volume below the screen before training begins. Competitor Trap: Most sea of green calculators online return a plant count and a yield number and stop there. They treat both SOG and SCROG as equivalent methods that differ only in plant count. The calculation that exposes the real difference is the vegetative electricity cost: not a subtle variable, but a number that can exceed $100 per cycle in a mid-size tent running SCROG. Growers who choose SCROG for “better yield” without running this number are often paying more in electricity and waiting twice as long to reach flower for the same harvest weight a well-executed SOG would have produced in half the time. To see your full operating cost picture beyond veg electricity, the grow light cost calculator breaks down monthly fixture running costs across the entire cycle. For climate control sizing, a correctly sized air conditioning unit is essential when running high-wattage setups in sealed rooms; the grow room AC sizing tool calculates the BTU load your lights contribute to the ambient heat budget. Minimum g/W threshold for LED: 1.0 g/W. Below 0.75 g/W warrants a lighting audit before the next cycle. Minimum light coverage: 30 W/sq ft. Below this level, canopy penetration is insufficient for dense SOG fills. SOG minimum veg duration: enough time for the canopy to fill the footprint, typically 10 to 21 days depending on plant size at transplant and cultivar growth rate. SCROG net should be set at 20 to 30 cm above the container tops to allow adequate branching volume below the screen before training begins. Competitor Trap: Most sea of green calculators online return a plant count and a yield number and stop there. They treat both SOG and SCROG as equivalent methods that differ only in plant count. The calculation that exposes the real difference is the vegetative electricity cost: not a subtle variable, but a number that can exceed $100 per cycle in a mid-size tent running SCROG. Growers who choose SCROG for “better yield” without running this number are often paying more in electricity and waiting twice as long to reach flower for the same harvest weight a well-executed SOG would have produced in half the time. To see your full operating cost picture beyond veg electricity, the grow light cost calculator breaks down monthly fixture running costs across the entire cycle. For climate control sizing, a correctly sized air conditioning unit is essential when running high-wattage setups in sealed rooms; the grow room AC sizing tool calculates the BTU load your lights contribute to the ambient heat budget.

## Limitations and safety

The yield estimate assumes 100% canopy fill. Sparse coverage, uneven training, or dead zones in the light footprint reduce actual yield without changing the calculation. g/W uses total fixture wattage, not wall draw adjusted for driver losses or heat load. Actual wall draw may be 5 to 15 W higher per fixture than the rated output. The electricity cost calculation assumes a constant $0.13/kWh. Rates vary significantly by region and time-of-use tariff. Adjust mentally for your actual rate. SOG veg period is assumed at 14 days. Some cultivars require 10 days; others need 21. SCROG veg is assumed at 56 days (8 weeks). Large canopies or slow-growing genetics may require 10 to 12 weeks. Plant density ranges are based on standard indoor photoperiod cultivation. Autoflowering strains are typically run at lower density and may not follow these ranges. This tool does not model multi-layer or vertical growing systems where canopy area and light footprint interact differently. Ounce conversion uses 28.35 g/oz (dry weight standard). Wet weight at harvest will be significantly higher. The tool does not account for nutrient costs, substrate costs, or labor. Electricity is one variable in the full cycle cost picture. Critical Warnings Our calculator exposes the hidden "electricity trap" by comparing the 14-day and 56-day vegetative power requirements. The SCROG Veg Electricity Trap: A 4×4 tent running a 600W LED on an 8-week SCROG veg consumes approximately 78 kWh before the first day of flower. At $0.13/kWh, that is $78.62 in electricity for vegetative growth alone, plus 56 days of calendar time. The same wattage, same canopy, and the same yield target under SOG completes its veg cycle in 14 days for $19.66. The tool surfaces this number explicitly because most yield calculators treat veg electricity as zero. Cloning Capacity Bottleneck in High-Density SOG: A 4×4 tent at maximum SOG density requires 64 plants. Continuous SOG cycling demands a permanent cloning pipeline. Without an aeroponic or propagation system capable of producing clones on a 14-day rotation, the SOG veg advantage collapses into irregular harvest gaps. Plant count at the high end of the density range is only sustainable with active clone production. Below 0.5 g/W: A Lighting Problem, Not a Technique Problem: If the calculator returns a g/W below 0.5, the issue is almost always a mismatch between light output and canopy size, not grow style or plant count. Swapping SOG for SCROG will not fix an under-lit canopy. The correct fix is to reduce the canopy footprint or increase fixture wattage. Light Intensity Above 50 W/sq ft: The tool flags this as a caution zone. While high-intensity LEDs can support above 50 W/sq ft with CO2 supplementation and precise vapor pressure deficit management, without those environmental controls, light intensities in this range risk photo-bleaching at the top of the canopy and uneven penetration below. Minimum Standards Minimum g/W threshold for LED: 1.0 g/W. Below 0.75 g/W warrants a lighting audit before the next cycle. Minimum light coverage: 30 W/sq ft. Below this level, canopy penetration is insufficient for dense SOG fills. SOG minimum veg duration: enough time for the canopy to fill the footprint, typically 10 to 21 days depending on plant size at transplant and cultivar growth rate. SCROG net should be set at 20 to 30 cm above the container tops to allow adequate branching volume below the screen before training begins. Competitor Trap: Most sea of green calculators online return a plant count and a yield number and stop there. They treat both SOG and SCROG as equivalent methods that differ only in plant count. The calculation that exposes the real difference is the vegetative electricity cost: not a subtle variable, but a number that can exceed $100 per cycle in a mid-size tent running SCROG. Growers who choose SCROG for “better yield” without running this number are often paying more in electricity and waiting twice as long to reach flower for the same harvest weight a well-executed SOG would have produced in half the time. To see your full operating cost picture beyond veg electricity, the grow light cost calculator breaks down monthly fixture running costs across the entire cycle. For climate control sizing, a correctly sized air conditioning unit is essential when running high-wattage setups in sealed rooms; the grow room AC sizing tool calculates the BTU load your lights contribute to the ambient heat budget.

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## Provenance

- Model ID: `tyg-749`
- Model version: `1.0.0`
- Reviewed by: Umer Hayiat
- Page modified: 2026-08-25T01:29:41
- Runtime SHA-256: `1fe325d15c9cf20ab610f4a87b84986ae7315af38366d439e73825d7fee0ff7a`

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