Tool category
Garden calculators
Buying the right amount once beats guessing twice. Each calculator shows the math behind the answer, states its assumptions, and gives results in the units materials are actually sold in.
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Soil calculator
Calculate how much soil your garden needs.
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Mulch calculator
Estimate mulch volume and bags required.
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Compost calculator
Size a topdressing layer or a soil amendment blend.
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Plant spacing calculator
Find how many plants fit in your garden.
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Watering calculator
Convert weekly water depth into gallons and runtime.
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Drip irrigation calculator
Turn emitter flow rates into weekly drip runtime.
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Seed quantity calculator
Work out how many seeds a garden bed needs.
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Fertilizer calculator
Convert a nitrogen rate into dry product weight.
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Potting mix calculator
Size pots and planters in quarts, cubic feet, and bags.
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Seed germination calculator
Turn a towel test into a sowing rate.
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Raised bed calculator
Get a lumber cut list and soil volume for a bed.
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Square foot garden planner
Lay out a bed in 1 foot squares and count the plants.
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Soil pH amendment calculator
Get pounds of lime or sulfur to move your soil pH.
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Plants per person calculator
Size each crop planting to your household.
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Compost mix calculator
Balance greens and browns for a healthy pile.