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.
- 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.
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.
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