Free calculators built for African farms
Quick, practical sums for the decisions you make every season, in metric units and with the working shown. No sign-up and nothing to install, and they work on your phone in the field.
Crops
Plan inputs, planting and spraying, and estimate your harvest.
Fertiliser rate calculator
How much product to apply to hit a target kg/ha of N, P or K, and what it costs.
Open calculatorSeeding rate & plant population
Seeds per hectare and kg of seed needed for your target stand, row width and germination.
Open calculatorMaize yield estimator
Estimate grain yield in t/ha before harvest by counting cobs and kernels in the field.
Open calculatorGrowing degree days
Heat units accumulated since planting at any location in Africa, using live weather data.
Open calculatorSpray tank mix
Product per tank and number of tank loads for a field, from label rate and spray volume.
Open calculator
Soil & water
Work out how much water your crop needs and how long to irrigate.
Livestock
Match your herd to what your veld can carry.
Results are planning estimates. Always check product labels, and confirm rates with your agronomist, extension officer or local department of agriculture before you act on them.