Indoor cultivation energy consumption and cost calculator
01/14/2025 00:00:00 Oblicz koszty uprawy indoor
Indoor growing involves several costs that can be estimated even before purchasing the equipment. Lighting usually has the biggest impact, but ventilation, humidity control devices, pumps and other electrical equipment should also be included. In practice, the difference between a poorly matched setup and a well-planned one can mean dozens or even hundreds of kWh over the course of a complete growing cycle.
⚡ Indoor grow calculator
Want to calculate everything without doing the math manually? Our calculator lets you estimate electricity costs, choose an approximate LED power range for your grow tent size and calculate the required ventilation capacity.
The calculator can also direct you to suitable LED light categories, grow tents and complete grow kits matched to the selected growing area.
Table of contents
- What generates the highest costs?
- How to calculate electricity consumption?
- How much does an LED grow light cost to run?
- How much electricity does ventilation use?
- How to include additional devices?
- How to reduce indoor growing costs?
- FAQ
What generates the highest costs in indoor growing?
The largest electricity consumer in most indoor setups is lighting. A grow light rated at several hundred watts may operate for many hours every day, so even a relatively small difference in power consumption can noticeably affect the monthly electricity bill.
The second important element is ventilation. An extractor fan usually uses much less electricity than the lighting system, but it may operate 24 hours a day. Additional equipment may include circulation fans, water pumps, humidifiers, dehumidifiers, air conditioning, heating mats or air pumps.
For this reason, the real operating cost should be calculated as the total consumption of all devices rather than the lighting alone.
How to calculate electricity consumption in a grow tent?
The basic calculation is very simple:
Device power in kW × operating time in hours × number of days = electricity consumption in kWh
Example: a 300 W LED grow light equals 0.3 kW. If it operates for 12 hours per day for 30 days:
0.3 × 12 × 30 = 108 kWh
Then multiply 108 kWh by the actual price of one kWh from your electricity tariff.
It is best to use the current electricity price from your own bill, because rates vary depending on country, tariff, supplier and additional charges.
How much does an LED grow light cost to run?
Electricity consumption depends mainly on the actual power draw of the LED grow light and the number of hours it operates. Do not rely only on the commercial model name — for calculations it is better to use the real power consumption specified by the manufacturer.
| LED power | 12 h/day | 18 h/day |
|---|---|---|
| 100 W | 36 kWh / 30 days | 54 kWh / 30 days |
| 200 W | 72 kWh / 30 days | 108 kWh / 30 days |
| 300 W | 108 kWh / 30 days | 162 kWh / 30 days |
| 480 W | 172.8 kWh / 30 days | 259.2 kWh / 30 days |
| 650 W | 234 kWh / 30 days | 351 kWh / 30 days |
Not sure what LED power you need?
Enter the width and length of your grow tent. The calculator will suggest an approximate power range and show suitable LED lights, grow tents and complete grow kits.
Choose an LED grow light for your grow tent →How much electricity does ventilation use?
An extractor fan usually consumes far less electricity than grow lighting, but it may run 24 hours a day. For example, a 40 W fan running continuously for 30 days consumes:
0.04 × 24 × 30 = 28.8 kWh
Circulation fans should also be included. Two small 15 W fans operating continuously consume another 21.6 kWh per month.
When selecting ventilation capacity, resistance caused by a carbon filter, ducting and bends should also be considered. For this reason, the real ventilation system should have an appropriate performance reserve.
Calculate the required grow tent ventilation →
How to include additional devices?
In more advanced indoor setups, LED lighting and ventilation alone do not show the full electricity cost. Additional devices may include:
- circulation fans,
- humidifiers,
- dehumidifiers,
- air conditioners,
- heaters and heating mats,
- water pumps,
- air pumps,
- ozone generators,
- controllers and automation systems.
The indoor grow calculator allows you to add these devices separately and specify their power, quantity and operating time. This makes it possible to estimate the total electricity cost more realistically.
How to reduce indoor growing costs?
The biggest savings usually come from selecting the right lighting power. An oversized lamp not only uses more electricity but may also increase the temperature inside the grow tent, which can require stronger ventilation or air conditioning.
It is also worth choosing ventilation according to the actual tent size, using fan speed controllers where appropriate and controlling how long additional devices operate.
The lowest power consumption is not always the best solution. What matters most is matching the complete setup to the actual growing area.
Choose a complete setup for your grow tent
Enter the dimensions of your planned growing area to receive an approximate LED power recommendation, required ventilation capacity and direct access to suitable LED lights, grow tents and complete grow kits.
Try the indoor grow calculator →FAQ – electricity costs and indoor grow calculator
At 12 hours per day, a 300 W LED grow light consumes approximately 108 kWh over 30 days. At 18 hours per day, consumption is approximately 162 kWh. Lighting is usually the largest electricity consumer. In larger installations, dehumidifiers, air conditioning and heating can also account for a significant share of energy consumption. A single fan normally consumes far less electricity than a grow light, but it may operate 24 hours per day, so it should still be included in the calculation. Calculate the electricity consumption of all devices during each stage and multiply the total by your electricity price. The indoor grow calculator performs these calculations automatically. Yes. After entering the grow tent dimensions, the calculator suggests an approximate LED power range and directs you to suitable lighting and grow tent categories. Yes. Additional devices can be added separately by entering their power, quantity and daily operating time. Use the real price per kWh from your current electricity tariff or bill. This will make the result much closer to your actual operating costs. How much electricity does a 300 W LED grow light use?
What uses the most electricity in a grow tent?
Does a ventilation fan use a lot of electricity?
How do I calculate the cost of a complete growing cycle?
Does the calculator also help choose an LED grow light?
Can I include a humidifier, dehumidifier or pump?
What electricity price should I enter?
Summary
Electricity costs in indoor growing can be estimated quite accurately before the system is even switched on. The key is to include not only lighting but also ventilation and additional equipment.
If you are still choosing your equipment, use our indoor grow calculator. In addition to electricity costs, it can help estimate LED power, ventilation requirements and direct you to suitable grow lights, grow tents and complete grow kits.