30 free tools
All Garden Tools
Calculators and planners for every part of gardening — planting dates, watering, soil, seeds, light and pest problems. Free to use, no sign-up.
Planting & frost
Planting Calendar by ZIP / Zone
Enter your ZIP code or USDA zone and see what to plant this month — vegetables, herbs and flowers, with sowing and transplant windows.
❧Frost Date Calculator
Find the average last spring frost and first autumn frost for your USDA zone — ranges, not exact dates, with a reminder to check your local extension.
❧Last / First Frost Lookup
Look up average last and first frost dates for any USDA hardiness zone, from zone 1 to zone 13.
❧Hardiness Zone Finder
Find your USDA hardiness zone from your ZIP code or state, and see what it means for the plants you can grow.
❧Garden Planner — What to Plant This Month
Pick your zone and month and get a planting list for this month — what to sow outdoors, start indoors and transplant.
❧Pruning Calendar
Find the right pruning window for common shrubs, trees and roses — by plant type and your zone.
Sowing & growing calculators
Seed-Starting Calculator
Enter your last frost date and a crop to work out when to start seeds indoors and when to transplant them out.
❧Seed Spacing Calculator
Work out how many seeds or seedlings fit in a row or bed at the recommended spacing for each crop.
❧Plant Spacing Calculator
Calculate plant spacing for beds and rows — how many plants fit, and how far apart to set them.
❧Germination Time Calculator
See typical germination times for common vegetables, herbs and flowers at different soil temperatures.
❧Harvest Date Calculator
Enter a sowing or transplant date and a crop to estimate the harvest window from days to maturity.
❧Seed Viability Checker
Check how long common seeds stay viable and how to run a simple germination test on old seed packets.
❧Vegetable Yield Estimator
Estimate the harvest from a bed or row — typical yields per plant or per row-foot for common vegetables.
❧Soil Volume Calculator
Work out how much soil, compost or potting mix you need for a raised bed, container or pot — in cubic feet and bags.
❧Raised-Bed Soil Calculator
Calculate the soil volume for a raised bed by length, width and depth, with a topsoil-compost mix suggestion.
❧Mulch Calculator
Work out how many bags or cubic yards of mulch you need to cover a bed at your chosen depth.
❧Potting-Mix Calculator
Calculate the parts for a homemade potting mix — peat or coir, perlite and compost — for any pot size.
❧Fertiliser Calculator
Work out how much fertiliser to apply per square foot or per plant from the label rate and your bed size.
❧Compost Ratio Calculator
Balance greens and browns in your compost pile — the ratio to aim for and how to fix a pile that is too wet or too dry.
Planners
Care, light & problems
Watering Calculator
Estimate how much water a bed, container or houseplant needs based on size, soil and weather — a starting point, not a rule.
❧Watering Schedule Generator
Build a watering schedule for your houseplants or garden beds — by plant type, pot size, light and season.
❧Grow-Light Calculator
Work out how many hours of grow light your seedlings or houseplants need and how far to hang the light.
❧Humidity & Temperature Checker
Check whether your room's temperature and humidity suit common houseplants, and what to adjust if they do not.
❧Sunlight Calculator
Work out how many hours of direct sun a garden spot or windowsill gets, and which plants suit it.
❧Repotting Calculator
Find the next pot size for a root-bound houseplant and how much fresh potting mix you will need.
❧Herb Drying Calculator
Convert fresh herb harvests to dried weight and work out drying time for common culinary herbs.
❧Pest Identifier Helper
Answer a few questions about the damage you see and narrow down the likely garden pest, with organic control steps.
❧Plant Disease Checker
Match leaf spots, wilting and discolouration to common plant diseases, with what to do next — and when to ask your local extension.