Garden & outdoors
tools and calculators.
20 practical tools with clear inputs and explanations. Choose a tool below, or explore a role-based toolbox for a collection that fits your day.
Square-foot garden grid
Create a labelled planting allocation grid from your chosen cell density.
Garden sowing date worksheet
Turn crop offsets into dated sowing and transplant plans.
Succession planting schedule
Plan repeated sowings and expected harvest dates on a calendar.
Seed germination batch log
Compare observed germination rates across your seed batches.
Drip irrigation zone budget
Group whole drip lines within a supplied flow capacity.
Sprinkler catch-can analysis
Calculate catch-depth uniformity and application rate from your measurements.
Compost carbon–nitrogen mass balance
Combine supplied dry-mass carbon and nitrogen compositions.
Fertiliser nutrient mass budget
Sum declared N–P₂O₅–K₂O masses across listed products.
Liquid orifice discharge
Estimate discharge from head, circular opening size and a supplied coefficient.
Gravity tank drain curve
Plot liquid head and outflow as a constant-area tank drains.
Soil volume calculator
Estimate loose soil and whole bags for a rectangular area.
Raised bed fill calculator
Account for internal dimensions and unfilled space at the top.
Plant pot volume calculator
Estimate a tapered round pot’s internal capacity.
Mulch coverage calculator
See how far a bag or delivery will cover at your chosen depth.
Plant spacing planner
Lay out an evenly spaced rectangular planting grid.
Lawn seed quantity calculator
Estimate seed from area and the application rate on your pack.
Pond volume calculator
Estimate capacity from surface dimensions and average water depth.
Rainwater collection estimator
Translate rainfall and roof area into a potential collection volume.
Irrigation runtime calculator
Calculate the time needed to deliver a chosen water volume.
Seed tray planner
Estimate trays and seeds for a target number of seedlings.