Garden tools and calculators
Simple planning aids. Each one shows its units, its assumptions and its limits. They do not know your soil, your plants or your climate.
Raised-bed soil volume
How much soil or compost does a rectangular bed need? Imperial or metric, with an optional settling allowance and bag count.
Garden spacing
How many plants fit in a bed, given the spacing on the seed packet or plant tag?
Tools we link to instead of rebuilding
Climate and hardiness lookups, plant databases and local growing advice are better served by the organizations that maintain them.
- USDA Plant Hardiness Zone Map: Look up your hardiness zone by ZIP code. Zones describe average winter lows, not frost dates or heat.
- Land-grant university website directory (USDA NIFA): Find your state's land-grant university, the home of its Cooperative Extension gardening guidance.