Contact
Contact us
Found a mistake, have a question about a result, or want a tool that is not here yet? Email is the way to reach us.
What to write about
- Report a wrong number
Say which page, what you typed and what you expected to see. A screenshot helps. Corrections are checked against the source and fixed first.
- Ask about a result
Not sure what a reading means for your room? Send your numbers and your setup (tent size, lights, stage).
- Suggest a tool or a change
Missing a unit, a crop or a calculator you need? Ideas from growers decide what gets built next.
- Embedding and links
Questions about putting the calculator on your site, or about linking to a page.
Before you write
- Where each number and target range comes from is listed under Sources at the bottom of each calculator.
- What the site stores (only settings in your own browser) is on the Privacy Policy page.
- Please do not send passwords, payment details or anything private. We never ask for them.