Soil health, testing, and amendment tools. Browse our free soil tools below — all calculators are instant, accurate, and require no sign-up.
Available Water Capacity Calculator — Calculate available water capacity from field capacity, wilting point, root depth, and bulk density. Plan irrigation amounts and frequency.
Compost Application Rate Calculator — Calculate compost application rate in tons per acre based on target nitrogen availability, total N content, and mineralization rate.
Cation Exchange Capacity (CEC) Calculator — Calculate and interpret cation exchange capacity from soil test data. Understand nutrient holding capacity and base saturation ratios.
Field Capacity Estimator — Estimate soil field capacity from texture and organic matter using Saxton-Rawls pedotransfer functions. Plan irrigation scheduling.
Gypsum Application Rate Calculator — Calculate gypsum tons per acre to reduce sodium percentage in soil based on soil Na%, target Na%, CEC, and treatment depth.
Lime Application Rate Calculator — Calculate agricultural lime application rate in tons per acre using buffer pH, lime factor, and effective neutralizing power (ENP).
Soil Bulk Density Calculator — Calculate soil bulk density from core sample measurements. Determine dry mass per volume for compaction assessment and soil health.
Soil Carbon Sequestration Calculator — Estimate carbon stored in soil from organic matter change. Calculate CO₂ equivalent sequestered per acre from soil health practices.
Soil Compaction Assessment Calculator — Assess soil compaction severity from penetrometer readings. Estimate yield drag percentage and get management recommendations.
Soil Erosion (USLE) Calculator — Estimate annual soil loss using the Universal Soil Loss Equation (USLE). Enter R, K, LS, C, and P factors for erosion prediction.
Soil Moisture Content Calculator — Calculate gravimetric and volumetric soil moisture content from wet and oven-dry soil sample weights. Essential for irrigation management.
Soil pH Adjustment Calculator — Calculate the amount of lime or sulfur needed to adjust soil pH based on current pH, target pH, soil texture, and buffer index.
Soil Test Interpretation Calculator — Interpret soil test results for pH, phosphorus, potassium, organic matter, and CEC. Classify nutrient levels and get recommendations.
Soil Texture Triangle Calculator — Determine USDA soil texture class from sand, silt, and clay percentages. Enter particle size analysis results to classify your soil.
Permanent Wilting Point Estimator — Estimate soil permanent wilting point from texture and organic matter using Saxton-Rawls pedotransfer functions for irrigation planning.