This page explains how GardenCalc creates, checks and updates its calculators and guides.
Accuracy
- Every formula is published on the calculator page alongside a worked example using realistic inputs.
- Before publishing, each calculator is tested with typical, minimum, fractional, maximum and invalid inputs, and every unit conversion is checked against known reference values.
- Numbers are kept at full precision during the calculation. We round up only where the result is something you buy whole, such as bags, trays, posts or plants.
Horticultural assumptions
Yields, spacings and productive periods vary widely with variety, climate, soil, season length and care. Where we offer default figures they are clearly labelled as starting points, and every one can be edited. Where no dependable figure exists, we ask you to enter your own rather than inventing a global default.
Safety limits
Our tools never assess structural loads. For balconies, railings, walls and window ledges, consult the building owner or a qualified professional before adding heavy planters. We do not give food-safety processing advice.
Reviews and updates
Each calculator shows the month it was last reviewed. We revisit tools when readers report a problem, when we add features, and at least once a year.
Corrections
If you find an error, please contact us with the calculator name and the inputs you used. We correct confirmed errors promptly and note significant changes on the page.
Advertising and independence
We may show advertising to keep the tools free. Ads are always kept visually separate from calculator inputs, results and buttons, and advertisers have no influence over our formulas or content.