Greenhouse Calculators
Free calculators to help you plan, set up and run your greenhouse. Each one works out the numbers for your greenhouse and your climate, then shows the products that fit.
- Heater Size CalculatorHow many BTUs it takes to keep your greenhouse warm on the coldest night.
- Heating Cost CalculatorWhat a winter of heating will cost with electric, propane or natural gas.
- Fan and Ventilation CalculatorThe exhaust fan CFM and vent openings that keep summer heat down.
- Solar Panel CalculatorHow many solar panels and how much battery it takes to run your fans, pumps and lights.
- Snow Load CalculatorHow much the snow on your roof weighs and when to brush it off.
- Foundation CalculatorConcrete, gravel, pavers and lumber for your greenhouse base.
- Greenhouse Size CalculatorHow big a greenhouse you need for the plants you want to grow.
- Shade Cloth CalculatorThe right shade percentage and cloth size for your greenhouse.
- Grow Light CalculatorHow many grow lights it takes to give your plants enough light in winter.
- Rainwater CalculatorHow much water your greenhouse roof can collect for your plants.
- Food Yield CalculatorHow many pounds of food your greenhouse can grow, and how much of your family's produce that covers.
- Water Storage CalculatorHow many days your stored rainwater will last your greenhouse plants.
Please note: these results are estimates
This calculator gives general estimates based on typical conditions and the information you enter. Results depend on your location, climate, greenhouse type and how you set it up and use it. Your actual results may be different, so use these numbers as a starting point for planning, not a guarantee. Always follow the manufacturer's instructions, and talk to a qualified professional before making important decisions. Questions? Call us at 678-408-8222.
Where to start
Which calculator do I need?
Choosing a greenhouse? Start with the greenhouse size calculator, then check the snow load calculator if you get heavy snow, and plan the base with the foundation calculator.
Getting ready for winter? Size your heater with the heater size calculator, see what it will cost with the heating cost calculator, and check your plants get enough light with the grow light calculator.
Getting ready for summer? Use the fan and ventilation calculator and the shade cloth calculator to keep things cool, and the rainwater calculator to plan your watering.
Going off-grid? The solar panel calculator sizes the panels, battery and charge controller for your fans, pumps and lights. The food yield calculator shows how much food you can grow, and the water storage calculator shows how long your rain barrels will last. See our Going Off the Grid guide for the full plan.
Want a second opinion?
Tell us about your greenhouse and where you live, and we will help you get it right.
Call 678-408-8222Send us a message