Gardening & Crops Calculators
Free gardening & crops calculators. Instant results, no login required.
13 tools availableAcres Per Hour Calculator
Calculate how many acres per hour your farm equipment covers based on implement width, travel speed, and field efficiency. Includes metric conversion and daily output estimate.
Bulb Spacing Calculator
Calculate how many bulbs you need for any planting bed, or how much space a set number of bulbs requires. Supports square grid and triangular offset planting patterns with metric and imperial units.
Compost Calculator
Calculate exactly how much compost you need for any garden bed, raised bed, or lawn. Get volume in cubic feet and cubic yards, bag count, bulk order quantity, weight estimate, and a bagged vs bulk cost comparison.
Corn Yield Calculator
Estimate corn yield per acre using the ear count pre-harvest method or moisture-corrected actual harvest weight. Outputs bu/acre, t/ha, total bushels, and revenue estimate.
Daily Light Integral Calculator
Calculate DLI from PPFD and photoperiod, find the PPFD needed to hit a target DLI, or plan supplemental greenhouse lighting. Includes crop targets and fixture efficacy conversion.
Fertilizer Calculator
Calculate exactly how much fertiliser you need for any garden area. Enter the N-P-K ratio on your bag, your area, and application rate to get precise product quantities, nutrient delivery, and seasonal crop comparisons. Supports granular and liquid feeds, metric and imperial.
GDU Calculator (Growing Degree Units)
Calculate daily and cumulative Growing Degree Units for corn, wheat, soybean, tomato, and apple. Track crop stage progress, forecast days to maturity, and plan harvest timing with the three-mode GDU tool.
Grain Conversion Calculator
Convert grain quantities between bushels, metric tonnes, short tons, long tons, kilograms and pounds for 14 crops. Includes moisture correction (shrinkage) and price conversion between $/bu and $/MT.
Grass Seed Calculator
Calculate how much grass seed you need for a new lawn or overseeding project. Enter your area and grass type to get exact grams needed, bags to buy, and germination timelines. Supports perennial ryegrass, fine fescue, tall fescue, bent grass, and more.
Lawn Mowing Cost Calculator
Calculate your annual lawn mowing costs for contractor or DIY mowing. Enter lawn size and frequency to get annual totals, monthly averages, and a 5-year projection. Includes UK contractor benchmarks and DIY true cost with equipment amortisation.
Mulch Calculator
Calculate how much mulch you need for any garden border, bed, or path. Enter your area and depth to get exact volume in m³ and litres, weight, and number of bags to buy. Supports bark, compost, gravel, and 8 mulch types.
Plant Population Calculator
Calculate plant population per hectare, acre, or m² from row and in-row spacing. Supports square, triangular, and row planting patterns with crop presets for corn, wheat, soybean, potato, and more. Includes reverse mode: target population to required spacing.
Plant Spacing Calculator
Calculate how many plants you need for any bed or border. Enter your plant spacing and area to get exact plant counts and order quantities with 10% contingency. Includes presets for 15 vegetables and flowers with RHS-sourced spacing recommendations.