Our farming calculators help growers, smallholders, agronomy students and hobby gardeners put numbers on the decisions that drive a season. Seed, fertilizer, water and feed are the biggest variable costs on most farms, and small errors multiplied across a field add up quickly. These six tools take your area, rates and product details and return quantities you can order or apply, so you spend less time on back-of-envelope sums and more on the work itself.
Working with land records in bigha? The Acre to Bigha Converter translates field sizes first.
How do I turn a nutrient rate into a fertilizer amount? Divide the nutrient rate by the nutrient percentage of the product. For 50 kg of nitrogen per hectare using urea (46% N), that is about 109 kg of urea per hectare.
Why does germination rate change the seed rate? If only 85% of seeds germinate, you need proportionally more seed to reach the same stand. Use the germination figure on the seed tag rather than assuming 100%.
Can these replace a soil test? No. Fertilizer maths is only as good as the recommendation you feed in, and a soil test is the best source for it.
All of these farming calculators are free, run in your browser and need no sign-up.