Farm calculators
Hydroponic nutrient solutions, livestock due dates, seeding rates, land measurements and more. Free, no sign-up, and they work on your phone even without signal.
💧 Hydroponics
- Hydroponic nutrient calculator Work out how many grams of each fertilizer salt you need for a Steiner, Hoagland or custom nutrient solution, with A and B stock tanks.
- EC to ppm converter Convert electrical conductivity (mS/cm, µS/cm) to ppm on the 500, 640 and 700 scales, with recommended EC ranges by crop.
🐄 Livestock
- Animal gestation calculator Find the expected due date from the breeding or AI date, with the normal birth window, heat check date and dry-off date.
- Cattle weight calculator Estimate the live weight of cattle from heart girth and body length with the Schaeffer formula. Results in pounds and kilograms, no scale needed.
🌱 Crops & land
- Land area converter Convert Latin American land units (manzana, tarea, cuerda, vara, caballería, fanegada) to acres, hectares, square meters and square feet.
- Seeding rate calculator Calculate plants per acre for row, square or triangular spacing, plus the seeds and pounds of seed you need based on germination and seed weight.
- Sprayer mix calculator Work out how much herbicide, insecticide or fungicide to add per sprayer tank from a per-acre, per-100-gallon or per-gallon label rate.