Free Garden Planning Tools
Eight free calculators for home gardeners. Get instant answers on spacing, fertilizer, water, and yield — no email required.
Accurate formulas
Based on extension service guidelines and university research — not guesswork.
Instant results
No loading, no sign-up, no ads interrupting your flow. Just type and get your answer.
Imperial & metric
Every calculator supports both unit systems. Switch with one click.
Spring Planting Season
Planning your spring garden? Start with the Plant Spacing Calculator to map your beds, then use the Seed Quantity tool to know exactly how many seeds to buy.
Every calculator is free, instant, and works on mobile. No account needed.
Find how many plants fit in your bed and the exact spacing between each one. Supports square, rectangular, and triangular grid layouts.
Calculate how much fertilizer to apply based on your garden area and NPK ratio. Supports pounds per 1,000 sq ft and kg per 100 sq m.
Find out how much water your garden needs per week based on bed size, plant type, and your local climate. Accounts for rainfall.
Calculate exactly how much soil, compost, and amendments you need to fill your raised bed. Supports custom soil mix ratios.
Find how much compost or mulch you need to cover your garden beds at a given depth. Outputs in cubic feet, cubic yards, and bags.
Estimate your expected harvest weight from any vegetable garden. Enter your crop, plant count, and bed size to forecast your yield.
Figure out exactly how many seeds to buy for your planned garden rows or beds. Accounts for germination rate and thinning.
Calculate how much lime or sulfur to add to reach your target soil pH. Enter your current pH, target pH, and soil type to get the right amount.