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Build, garden, sports, and hobby math — from lumber and pools to outdoor gear sizing.
A short list of high-use tools in this category.
Pool & Water
Estimate the total volume of water in your swimming pool. Supports rectangular, round, and oval pools for accurate chemical balancing.
Landscaping & Outdoor
Estimate vinyl privacy fence material costs from linear feet, fence height, gates, and your local price per foot. Includes a height factor for 8 ft panels and gate allowances for planning.
Gardening & Growing
Calculate how many pounds of fertilizer to apply from bag N-P-K and a target nitrogen rate per 1,000 sq ft. Shows P and K applied at that product rate and optional bag counts.
Gardening & Growing
Estimate weekly irrigation demand, per-session gallons, and runtime from garden area, target inches of water, efficiency, and flow rate.
Gardening & Growing
Estimate US gallons and liters from inner drum diameter, inner height, and optional fill percentage using cylinder volume for rainwater harvesting planning.
Gardening & Growing
Blend C:N from multiple compost ingredients by mass, or solve green-to-brown mass ratio for a target carbon-to-nitrogen ratio. Planning tool for backyard piles.
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