Tools · Cost
Cost per gram calculator
for cannabis growers
Enter your electricity price, lamps, days of veg and flower, consumables and dry yield. Get the real cost per gram, where the money goes and how much a better harvest saves.
Inputs
Currency
Electricity
Consumables per cycle
Result
Cost per gram
–/ g
Cost per gram at different yields
Same costs, harvest from −40% to +40% of your yield.
Method and sources. Electricity (kWh) = lamp W × hours × days ÷ 1,000: veg at 18 h/day, flower at 12 h/day, climate equipment at 24 h/day for the whole cycle. Cost per gram = (kWh × price + consumables + equipment wear) ÷ dry yield. Example values follow our cost per gram guide; replace them with your own receipts.
How the cost per gram is calculated
The calculator adds up one full cycle and divides it by the dry weight you harvest:
Cost per gram = (electricity + consumables + equipment wear) ÷ dry yield (g)
Electricity is counted for the lights in veg (18 hours a day), the lights in flower (12 hours a day) and the climate equipment running around the clock for the whole cycle, at your price per kWh. Consumables are what you spend per cycle on nutrients, substrate, genetics and water; equipment wear is the share of what your lamp, tent and fans cost that one cycle uses up.
What moves the number
- Yield is the biggest lever. Most costs are fixed for the cycle, so every extra gram lowers the price of all the others. Light at the canopy, genetics and harvest timing matter more than any single expense.
- Electricity is the largest running cost in most indoor grows. Efficient LEDs, a cheaper night tariff for the lights-on period and a climate that does not fight the lamps all show up here.
- Losses cost twice. Bud rot, a late chop or a rushed dry waste the money already spent on the whole cycle.
For the full breakdown with an example, read what it really costs to grow cannabis indoors. To check your light and yield efficiency, see grams per watt and the DLI calculator.