Skip the guesswork. Get exact plant counts, soil volumes, frost dates, and planting schedules — calculated instantly for your garden.
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Most Popular Tools
The tools home gardeners reach for most — pick what you need right now.
Calculate how many plants fit in any bed using grid or triangular patterns. Works for any vegetable or flower.
Use Calculator →Get exact bags and cubic yards to fill any raised bed. Includes Mel's Mix option for premium soil blends.
Use Calculator →Enter your ZIP code for last spring frost, first fall frost, and your USDA hardiness zone — instantly.
Use Calculator →Custom indoor and outdoor planting dates for 20 vegetables based on your ZIP code and frost dates.
Use Calculator →Enter your planting date and crop type to find your exact expected harvest date. Works for 20+ vegetables.
Use Calculator →Find which plants grow well together and which ones fight. Covers 22 common vegetables and herbs.
Use Calculator →No complicated setup. No learning curve. Just answers.
Browse 30 free calculators organized by category. Spacing, soil, timing, fertilizer, irrigation, planning.
Simple inputs — bed size, ZIP code, or plant type. No gardening degree required, no account needed.
Results calculate instantly using NOAA climate data and university extension service guidelines.
30
Free Tools
200+
Plants
NOAA
Climate Data
26
USDA Zones
All 30 Tools
Browse the complete collection — all 30 calculators are free, mobile-friendly, and live now.
Plant Spacing Calculator
Square Foot Garden Planner
Raised Bed Soil Calculator
Mulch Volume Calculator
Compost Ratio Calculator
Frost Date Calculator
Planting Calendar
Seed Starting Calculator
Days to Harvest
Companion Planting Checker
NPK Fertilizer Calculator
Watering Schedule Calculator
Vegetable Yield Estimator
Raised Bed Cost Calculator
USDA Zone Lookup
Growing Season Calculator
Succession Planting Calculator
Garden ROI Calculator
Soil pH Calculator
Drip Irrigation Calculator
Grow Bag Size Calculator
Flower Bulb Calculator
Tomato Cage Size Calculator
Crop Rotation Planner
Worm Composting Calculator
Cover Crop Seeding Rate
Tree Spacing Calculator
Seed Packet Planner
Hedge Spacing Calculator
Sun Hours Calculator
Every formula follows guidelines from Cornell, Purdue, and UC Davis Cooperative Extension services — not rough estimates.
Frost dates and planting windows come from NOAA's 30-year climate normals — the same data professional growers rely on.
No accounts. No emails. No paywalls. Open the tool, enter your numbers, get your answer. Takes under 30 seconds.
Every calculator is fully mobile-optimized. Use it in the garden with your phone in hand — even on slow connections.
GardenCalc By the Numbers
30 free tools. Zero signup. Instant answers.
Browse All 30 Tools →