Gardening Calculators
Calculators for planning garden beds — plant spacing and soil volume.
Number of Calculators: 9
What to Know
Planning a garden bed's soil volume, plant spacing, and watering needs, plus a few sustainability-adjacent calculators (Compost C:N Ratio, Rain Barrel, Compost Volume) for anyone managing a garden's inputs more deliberately.
Lawn Fertilizer and Lawn Watering both use real, cited application-rate guidelines rather than a generic rule of thumb — over- or under-applying either one has a real cost, in money or in a lawn's actual health. Hydroponic Nutrients and Seed Starting round out the set for anyone growing indoors or starting a garden from seed rather than transplants.
- Plant SpacingFind how many plants fit in a garden bed on an evenly-spaced grid, from the bed size and your plant spacing.
- Raised Garden Bed SoilCalculate how much soil you need to fill a raised garden bed, in cubic yards, cubic feet, and standard bags.
- Seed StartingFind when to start seeds indoors and roughly when to transplant them outside, from your local frost date and a plant's own weeks-before-frost guidance.
- Lawn FertilizerFind how many pounds of fertilizer to spread on your lawn, from its area, your desired nitrogen rate, and the product's own N-P-K label.
- Compost C:N RatioEstimate your compost pile's blended carbon-to-nitrogen ratio from the weight of your greens and browns, and see if it's in the ideal range.
- Compost VolumeEstimate how much compost your bin holds and how much finished compost it will produce, from its dimensions and fill level.
- Rain BarrelEstimate how many gallons or liters of rainwater your roof could collect from a storm or an average rainfall, and how many barrels that fills.
- Hydroponic NutrientsFind exactly how much nutrient concentrate to add to your reservoir from its dosage label, and convert between EC and PPM using the 500 or 700 scale.
- Lawn WateringFind out how much water your lawn needs each week and how long to run the sprinkler to deliver it, based on your lawn's area, rainfall, and your sprinkler's own output rate.