Garden Calculators

Carbon-to-nitrogen ratio of a compost mix by the Cornell formula, or the greens-to-browns amounts that reach a target ratio.

Drip irrigation math: gallons for inches of water over an area, emitter flow, supply limit and run time per watering.

Growing degree days from daily lows and highs with a base temperature and upper cutoff: daily and cumulative totals.

Fertilizer product needed for a nutrient target per 1000 sq ft from its N-P-K analysis, with the P and K delivered and bags.

Frost or freeze class of a forecast low against plant hardiness, plus where a date sits against your average frost dates.

Plants that fit a bed at a spacing (grid or offset rows) and seeds to sow from germination rate, per bed and per square foot.

Soil or mulch for a rectangular or round bed: cubic feet, yards, litres, bags, settling allowance and a mix split by parts.