All of our interactive garden tools are free, work in any browser, and require no sign-up. Built for US gardeners in zones 4–9.
💧Garden Watering CalculatorCalculate weekly water needs by plant type, bed size, and climate zone. Get a watering schedule and monthly cost estimate.
♻Compost Recipe BuilderAdd your materials and see your carbon-to-nitrogen ratio update in real time. Aim for 25–30:1 for fastest decomposition.
🌺Container Size MatchmakerSearch any plant and get recommended pot size, depth, material, and drainage requirements. Covers 100+ varieties.
❄Frost Date CalculatorSelect your USDA zone and get a countdown to your last spring frost and first fall frost, with a full planting timeline.
🥕Garden Harvest Value TrackerLog your harvests and see how much you save versus grocery store prices. Calculate your garden’s true ROI.
🌿Companion Planting ToolSearch any plant to see its best companions and plants to avoid, with the reason behind each pairing. 100+ plants covered.
📍Garden PlannerDrag and drop plants onto a grid layout. Set spacing, view companion conflicts, and plan your beds before you dig.
📅Seasonal Garden CalendarMonth-by-month tasks for zones 5–8. See what to sow, plant, prune, and harvest every month of the year.
Frequently Asked Questions
Are these garden tools really free?
Yes. All nine tools are completely free to use with no sign-up, no account, and no paywall. They run entirely in your browser.
Do the tools work on mobile?
Yes. Each tool is designed to work on phones and tablets as well as desktop browsers. The calculators and planners resize to fit your screen.
Seasonal Garden Calendar
Know exactly what to plant, prune and sow — every month of the year.
How accurate are the calculators?
The calculators use standard formulas from US extension service guidelines (University of Minnesota, University of Georgia, NOAA). They give reliable estimates for planning purposes. Actual results vary based on your specific soil, climate, and plant varieties.
Which tool should I start with?
If you’re setting up a new garden, start with the Frost Date Calculator to establish your planting window, then the Soil Calculator to fill your beds correctly. If you’re planning what to grow where, the Companion Planting Tool and Garden Planner are the best starting points.