Cannabis Cost Per Gram Calculator

Calculate exactly what your homegrown cannabis costs per gram. Enter your setup and recurring expenses, compare against dispensary prices, and find out when you break even.

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Setup Costs (one-time)

Recurring Costs (per grow cycle)

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Cost/Gram (First Grow)
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Cost/Gram (Ongoing)
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Annual Cost
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Annual Yield
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Break-Even Point
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How Much Does It Cost to Grow Cannabis at Home

Typical startup cost: $75 - $250 for a basic indoor setup. Ongoing cost per gram: $2 - $5 once equipment is paid off. Most home growers recoup their initial investment within 2 - 3 harvests and save hundreds of dollars per year compared to dispensary purchases.

The total cost of growing cannabis at home depends on whether you grow indoors or outdoors, the quality of equipment you choose, and how many plants you cultivate per cycle. Indoor setups require more upfront investment but give you year-round growing capability and full environmental control. Outdoor grows are dramatically cheaper but limit you to one harvest per year in most climates.

The single biggest factor in your cost per gram is yield. A grower who harvests 400 g from a $200 recurring cycle pays $0.50/g, while someone harvesting 100 g from the same inputs pays $2.00/g. Improving your cultivation skills directly reduces your cost per gram.

Startup Costs for Indoor Cannabis Growing

Here is what you can expect to spend on a first-time indoor setup, broken down by budget tier:

Item Budget Option Mid-Range Premium
Grow Tent $50 - $70 $100 - $150 $200 - $350
Grow Light $60 - $100 $150 - $250 $400 - $700
Ventilation $30 - $50 $80 - $130 $150 - $250
Pots / Containers $10 - $15 $25 - $40 $50 - $80
Nutrients $20 - $30 $40 - $60 $80 - $120
Growing Medium $10 - $15 $25 - $40 $50 - $80
Seeds $20 - $30 $40 - $60 $80 - $120
pH Meter $10 - $15 $30 - $50 $80 - $120
Total $210 - $325 $490 - $780 $1,090 - $1,820

Monthly Recurring Costs for a Home Grow

Once your equipment is set up, these are the ongoing monthly expenses to budget for:

Category Estimated Monthly Cost Notes
Electricity $20 - $50 Varies by light wattage and local rates; LEDs use 30 - 40% less than HPS
Nutrients $10 - $25 Concentrated liquid lines last 2 - 4 grow cycles per bottle
Water $5 - $15 Higher with hydro systems; consider RO filter costs if using one
Replacement Supplies $5 - $15 pH solution, calibration fluid, replacement carbon filters, tape, ties

Homegrown vs Dispensary — Cost Comparison

Here is how growing at home stacks up against buying from a dispensary across the factors that matter most:

Factor Homegrown Dispensary
Cost per gram $2 - $5 (after setup) $8 - $15 (avg $10 - $12)
Quality control Full control over nutrients, pesticides, and flush Lab-tested but grower practices vary
Strain variety Any seed you can source; grow exactly what you want Limited to store inventory; popular strains sell out
Convenience Requires 10 - 30 min daily maintenance Walk in, walk out; available immediately
Time investment 3 - 5 months seed-to-harvest per cycle None
Legal considerations Home cultivation laws vary by state; check local limits Legal where dispensaries operate

How to Reduce Your Growing Costs

  1. Switch to LED lighting — LEDs use 30 - 40 % less electricity than HPS for the same light output. A 400 W LED replacing a 600 W HPS saves roughly $8 - $15 per month on your electric bill, which adds up to $100 - $180 per year.
  2. Reuse and amend soil — Instead of buying fresh soil every cycle, top-dress with compost and dry amendments. A $30 bag of amendments re-charges 4 - 6 pots, saving $20 - $40 per grow compared to buying new soil each time.
  3. Buy nutrients in concentrate — Concentrated nutrient lines (like dry salts) cost $0.01 - $0.03 per gallon of feed water versus $0.10 - $0.25 for pre-mixed liquid bottles. Switching saves $30 - $50 per grow cycle.
  4. Clone instead of buying seeds — One mother plant can produce unlimited clones for free. Seeds cost $8 - $15 each; with 4 plants per cycle and 3 cycles per year, cloning saves $100 - $180 annually.
  5. Grow outdoors when possible — Eliminating the tent, light, and ventilation drops startup cost to under $75 and monthly electricity to zero. Outdoor growers often report cost per gram below $1, saving $150 - $300 per cycle versus indoor.
  6. Buy equipment during sales — Black Friday, Prime Day, and 4/20 sales regularly discount grow tents 20 - 40 % and lights 15 - 30 %. Timing your initial purchase around these events can save $50 - $150 on a mid-range setup.

Frequently Asked Questions

How much does it cost to grow one cannabis plant?
A single indoor cannabis plant costs roughly $50 - $100 per grow cycle in recurring expenses (nutrients, electricity, soil, water). If you factor in a share of one-time setup costs ($200 - $500 for a basic tent, light, and ventilation), your first plant could run $150 - $300 total. By the second or third grow, recurring costs dominate and your per-plant cost drops significantly.
Is it cheaper to grow your own weed?
Yes, in most cases. After the initial equipment investment, homegrown cannabis costs $2 - $5 per gram, compared to $8 - $15 per gram at dispensaries. Most growers break even within 2 - 3 grow cycles and save $500 - $2,000 per year depending on consumption. Outdoor grows are even cheaper, often dropping below $1 per gram.
How much electricity does an indoor grow use?
A typical 4x4 tent with a 400 W LED light running 18/6 in veg and 12/12 in flower uses about 150 - 250 kWh per month, costing $15 - $40 depending on your electricity rate. Add ventilation fans and you might see $20 - $50 per month total. HPS lights use roughly 40 % more electricity than LEDs for the same output.
How many grows before I break even on setup costs?
Most home growers break even within 2 - 3 grow cycles. If your setup costs $400 and each harvest yields 200 g that would otherwise cost $10/g at a dispensary, you save $2,000 worth of product per cycle minus $150 - $200 in recurring costs. The exact break-even depends on your yield, local dispensary prices, and how much you consume.
What's the cheapest way to start growing cannabis?
The cheapest indoor setup is a small 2x2 tent ($50 - $70), a budget LED light ($60 - $100), a clip fan ($15), and basic soil with liquid nutrients ($30). Total: roughly $160 - $220. Outdoor growing is even cheaper — seeds, soil amendments, and a pot can get you started for under $50. The trade-off is less control over environment and a single harvest per year.
Do outdoor grows cost less than indoor?
Significantly. Outdoor grows eliminate electricity and equipment costs almost entirely. Your main expenses are seeds ($10 - $15 per seed), soil or amendments ($20 - $40), nutrients ($20 - $30), and water. A single outdoor plant can yield 200 - 600 g at a cost of $0.50 - $1.50 per gram. The downside is one harvest per year and less environmental control.

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