Agriculture & Farming
Farm planning calculators for seeds, fertilizer, irrigation, crop yields, and livestock management.
Our agriculture calculators help farmers, gardeners, and growers make informed decisions about planting, fertilizing, irrigating, and managing livestock. Each tool uses USDA data and extension service recommendations to provide practical estimates for farm planning. You might also find our Convert land area units, Calculate solar land needs, Analyze yield trends, Calculate farm break-even, Estimate land purchase costs, Convert measurement units, Model yield variability and Calculate growing seasons helpful for related calculations.
Agriculture & Farming Guide
Last updated: February 21, 2026
Last updated: February 21, 2026
What you can do in Agriculture & Farming
- •Calculate seed rates, spacing, and planting density for row crops and broadcast seeding
- •Determine fertilizer application rates based on soil test results and crop nutrient requirements
- •Estimate irrigation water needs using crop evapotranspiration (ET) and efficiency factors
- •Project crop yields based on planting density, expected losses, and regional averages
- •Plan greenhouse and high tunnel capacity with plant spacing and bench configurations
- •Calculate livestock feed requirements and feed conversion ratios for common species
Accuracy, assumptions, and sources
- •Seed rates and yields use USDA averages and land-grant university recommendations. Actual results vary with variety, soil, and weather.
- •Fertilizer calculations assume standard nutrient content. Always verify actual N-P-K percentages on product labels.
- •Irrigation estimates use reference evapotranspiration (ET₀) and crop coefficients. Local climate data improves accuracy.
- •Yield projections assume average growing conditions. Drought, pests, disease, and frost can significantly reduce actual yields.
- •Livestock feed ratios are typical values. Work with an animal nutritionist for commercial operations.
- •All calculations are for planning purposes. Verify with local extension services for region-specific recommendations.
Pick the right calculator fast
- If you need seed rates or fertilizer amounts→Seed & Fertilizer Application Calculator
- If you need to estimate crop water requirements→Irrigation Water Requirement Calculator
- If you want to project harvest yields→Crop Yield Estimator
- If you're planning greenhouse plant capacity→Greenhouse Capacity Planner
- If you need livestock stocking density calculations→Livestock Stocking Density Planner
- If you're planning crop rotation→Crop Rotation Planner
- If you need to plan tree planting layout→Tree Planting Layout Planner
Common mistakes to avoid
- •Using seed rates without accounting for germination percentage—always factor in expected germination rate.
- •Applying fertilizer based solely on calculator output without a soil test. Soil tests reveal actual nutrient levels.
- •Assuming irrigation needs are constant. Water requirements change dramatically with growth stage and weather.
- •Ignoring calibration of application equipment. Spreader and sprayer output varies with speed, pressure, and settings.
- •Using generic crop coefficients instead of local or variety-specific values for irrigation planning.
- •Forgetting to account for headlands, waterways, and other unplanted areas when calculating field inputs.
- •Applying nitrogen fertilizer rates designed for irrigated land to dryland crops.
- •Not adjusting planting density for soil type—heavier soils may support fewer plants than light, well-drained soils.
Editorial policy
- ✓All calculators provide educational estimates for farm planning, not certified agronomic recommendations.
- ✓Data sources include USDA, university extension services, and peer-reviewed agricultural research.
- ✓We don't store your farm data. All calculations run client-side in your browser.
- ✓Regional variations exist—always consult your local extension office for location-specific guidance.
- ✓Found an error? Email us at hello@everydaybudd.com and we'll fix it promptly.
- ✓Tools are updated when agricultural research provides improved calculation methods or data.
Top Picks
All Agriculture & Farming Tools
Frequently Asked Questions
How accurate are crop yield estimates?
Our yield calculators provide estimates based on average conditions, seed rates, and typical efficiencies. Actual yields vary significantly with weather, soil quality, pest pressure, and farming practices. Use estimates for planning, not guarantees.
What data sources do the agriculture calculators use?
We reference USDA data, university extension service publications, and peer-reviewed agricultural research. Fertilizer rates follow land-grant university recommendations. Regional variations exist—always verify with your local extension office.
How do I calculate fertilizer needs for my specific soil?
Our Fertilizer Calculator provides general recommendations based on crop type and area. For precise rates, you need a soil test showing current N-P-K levels. Most extension services offer affordable soil testing with customized recommendations.
Are livestock feed calculations suitable for commercial operations?
Our calculators provide educational estimates based on standard feed conversion ratios and nutritional requirements. Commercial operations should work with animal nutritionists who can formulate rations based on specific feed analyses and production goals.
How do irrigation calculators account for local conditions?
We use crop evapotranspiration (ET) formulas that factor in temperature, humidity, and growth stage. However, local soil drainage, rainfall patterns, and microclimate vary. Soil moisture sensors provide better real-time guidance than formulas alone.
Can I use these tools for organic or sustainable farming calculations?
Our calculators cover conventional metrics. Organic farming often uses different approaches (cover crops, compost rates, biological pest control) not fully captured here. Check USDA Organic or your certifier's guidelines for organic-specific calculations.