Agriculture & Environment calculators
Choose a task below. Check each calculator’s assumptions and units before using its result.
Activated Sludge F to M Calculator - Aeration MCRT Sizing
Determine Food-to-Microorganism (F/M) ratio, Mean Cell Residence Time (MCRT sludge age), hydraulic detention time, and aeration basin volatile solids inventory.
Activated Sludge F/M Ratio Calculator - Aeration MLVSS
Balance organic food substrate (BOD5) against biological mixed liquor volatile biomass (MLVSS) and determine hydraulic retention time (HRT).
Anaerobic Digester Biogas Calculator - Methane Yield Sizing
Determine daily biogas production (SCFD), pure methane energy yield, volatile solids destruction (VSD), and CHP cogenerated electric power in kW.
API 421 Oil Water Separator Calculator - Sizing Area Flow
Size gravity oil-water separators per API Publication 421: calculate droplet rise velocity, chamber cross-sectional area, required plan surface area, and chamber dimensions.
Baghouse Air to Cloth Calculator - Filter Area Sizing
Determine required filter media cloth area, total bag count, operating Air-to-Cloth (A/C) ratio, and interstitial can velocity per ACGIH guidelines.
Bucket Elevator Capacity Calculator - BPH & Motor HP
Determine volumetric handling capacity in bushels per hour (BPH), metric tons/hour, belt speed in FPM, and required head shaft drive motor horsepower.
Chlorine Disinfection CT Calculator - Contact Time Sizing
Determine EPA Surface Water Treatment Rule (SWTR) CT compliance, T10 effective contact detention time, baffling factors, and log-inactivation of pathogens.
Clarifier Overflow Rate Calculator - Surface & Weir Loading
Determine surface overflow rate (SOR), peripheral V-notch weir loading rate (WLR), hydraulic detention time, and solids loading rate (SLR) for sedimentation clarifiers.
Commercial Bulk Fertilizer Blending & N-P-K Application Calculator | AnythingOnline
Free bulk fertilizer blending calculator. Compute exact pounds of Urea, DAP, Potash, and AMS to meet target N-P-K soil test recommendations across farm acres with multi-nutrient credits.
Compost C:N Ratio & Carbon-Nitrogen Balance Calculator | AnythingOnline
Free compost C:N ratio calculator. Balance carbon browns and nitrogen greens to reach the optimal 25:1 to 30:1 C:N ratio and 50%–60% moisture for rapid hot composting.
Crop Evapotranspiration (ETc) & Water Demand Calculator | AnythingOnline
Free crop evapotranspiration calculator. Calculate ET0, crop coefficients (Kc), and daily irrigation water requirements per acre and hectare using FAO-56 standards.
Cyclone Dust Collector Calculator - Lapple Cut Point Sizing
Calculate cyclone cut-point diameter (d50), fractional particulate collection efficiency, gas inlet velocity, and static pressure drop per Lapple and Stairmand models.
DAF Air to Solids Ratio Calculator - Flotation Efficiency
Size DAF recycle pressurization systems and calculate the Air-to-Solids (A/S) ratio, microscopic bubble air release, and hydraulic loading rates.
Diffused Aeration Oxygen Calculator - SOTR AOTR Sizing
Convert Actual Oxygen Transfer Rate (AOTR) to Standard Oxygen Transfer Rate (SOTR) per ASCE 2-06 and calculate required blower airflow in SCFM and motor horsepower.
Drip Irrigation Run Time & Emitter Flow Calculator | AnythingOnline
Free drip irrigation runtime calculator. Calculate irrigation run time, emitter application rate (in/hr and mm/hr), and water volume for crops, orchards, and gardens.
Dust Conveying Velocity Calculator - Duct Transport Sizing
Determine ACGIH minimum particulate transport velocities, duct branch diameters, velocity pressures, and friction static pressure losses for dust collection systems.
Flare Knockout Drum Calculator - API 521 Droplet Sizing
Size horizontal flare knockout (KO) drums per API 521: calculate critical droplet settling velocity (300 - 600 µm), allowable vapor velocity, vessel diameter, and emergency liquid holdup.
Flare Purge Gas Rate Calculator - Husa Ingress Velocity
Calculate continuous purge gas flow rates (SCFH) and velocity to prevent atmospheric oxygen ingress and internal burnback explosions per API 521 and the Husa correlation.
Flare Stack Height Calculator - API 521 Radiation
Calculate minimum required flare stack height, thermal radiation contours at grade, flame length, and wind tilt angles per API Standard 521.
Flare Tip Velocity Calculator - API 521 Mach Number
Calculate flare tip exit velocity, Mach number, and regulatory compliance limits per API 521 and EPA 40 CFR 60.18 to ensure flame stability and prevent blow-off.
Gas Turbine Water Injection Calculator - NOx Diluent Rate
Calculate demineralized water or steam injection flow rates (GPM & lb/hr), water-to-fuel mass ratios, thermal NOx suppression (ppmvd), and power augmentation boost.
Grain Aeration Fan CFM Calculator - Static Pressure inWG
Determine total fan airflow delivery (CFM), system resistance static pressure in inches water gauge (inWG) from Shedd's curves, and motor horsepower.
Grain Auger Capacity Calculator - BPH Throughput & Angle
Calculate portable screw conveyor throughput in bushels per hour (BPH), angle-of-incline derating, flight rotational RPM, and drive PTO horsepower.
Grain Drying Shrink Calculator - Moisture Loss & Bushels
Calculate exact physical water loss, commercial elevator handling shrink deductions, net delivered bushels, and drying fuel expenses.
Grain Silo Capacity Calculator - Bushels & Metric Tons
Determine total grain storage capacity in Winchester bushels, metric tons, and cubic feet, accounting for conical roof peaking and deep-bin pack compaction.
Greenhouse Heater Calculator - BTU Loss & Glazing
Calculate total BTU/hr heating requirements based on surface area, glazing U-value, and winter design temperatures.
Growing Degree Days (GDD 86/50) & Corn Maturity Calculator | AnythingOnline
Free corn Growing Degree Day (GDD 86/50) calculator. Compute accumulated GDU heat units, crop phenology stages from emergence to black layer maturity, and planting date adjustments.
Hay Bale Moisture & Spontaneous Combustion Risk Calculator | AnythingOnline
Free hay bale moisture and combustion risk calculator. Evaluate fire hazard, microbial heating curves, and dry matter feed loss for round and square bales.
Ion Exchange Softener Calculator - Resin Volume Sizing
Size industrial Strong Acid Cation (SAC) water softener resin beds, calculate total hardness grains removed, salt regenerant consumption, and cycle service runtimes.
Lamella Clarifier Calculator - Inclined Plate Settler
Calculate total effective horizontal settling area, footprint space reduction percentage, plate pack hydraulic loading, and Reynolds flow stability for lamella plate clarifiers.
Lawn Fertilizer Calculator - Nitrogen Rate & Bag Pounds
Determine exact fertilizer bag weight to apply 0.5 to 1.0 lb of nitrogen per 1,000 square feet.
Manure Nutrient (N-P-K) Application Rate & Fertilizer Credit Calculator | AnythingOnline
Free manure nutrient application calculator. Determine crop N & P application rates, incorporation volatilization factors, and commercial fertilizer savings.
Mixed Bed Polisher Calculator - Silica Breakthrough Life
Calculate mixed-bed demineralizer polisher service run time to reactive silica breakthrough (<10 ppb), Strong Base Anion (SBA) resin capacity, and chemical regenerant demand.
Mulch Coverage Calculator - Cubic Yards & Bag Count
Determine exact cubic yards, cubic feet, and bagged mulch quantities for garden beds.
Pasture Carrying Capacity & AUM Grazing Calculator | AnythingOnline
Free pasture carrying capacity and AUM calculator. Calculate stocking rates, animal unit equivalents (AUE), available forage, and grazing days.
Plant Spacing Calculator - Grid Rows & Square Footage
Calculate total plant counts for square and staggered triangular groundcover patterns.
Planter Seed Spacing, Population & Seed Units Calculator | AnythingOnline
Free planter seed spacing calculator. Compute in-row seed drop spacing in inches, seeds per foot, planter population adjustments for emergence mortality, and total seed bags across farm acres.
Pulse Jet Baghouse Air Calculator - Pulse Cleaning Sizing
Determine continuous compressed air consumption (SCFM), air receiver tank sizing, pulse valve air volume per shot, and required air compressor motor horsepower.
Pure Live Seed (PLS) & Seeding Rate Calculator | AnythingOnline
Free Pure Live Seed (PLS) calculator. Calculate bulk seeding rate, total seed needed, and true cost per live seed pound from purity and germination lab ratings.
Raised Bed Soil Calculator - Cubic Feet, Yards & Mix
Calculate total cubic feet, cubic yards, and component blend ratios for garden raised beds.
Reverse Osmosis NDP Calculator - Osmotic Pressure Sizing
Calculate feed-concentrate average osmotic pressure, Net Driving Pressure (NDP), temperature correction factor (TCF), and normalized permeate flux per ASTM D4516.
Silage & Baleage Dry Matter (DM) Tonnage & Feed Value Calculator | AnythingOnline
Free silage and baleage dry matter calculator. Compute wet vs dry matter tonnage, cost per ton of DM, and cattle herd feed consumption based on moisture percentage.
Silage Bunker Silo Density, Tonnage & Packing Calculator | AnythingOnline
Free silage bunker silo calculator. Compute bunker volume, dry matter compaction density (lbs DM/cu ft), total stored forage tonnage, packing tractor weight, and face spoilage removal rates.
Silt Density Index Calculator - ASTM D4189 SDI Sizing
Calculate ASTM D4189 Silt Density Index (SDI15, SDI10, SDI5) from filtration times, percent plugging, and reverse osmosis membrane colloidal fouling risk.
Sludge Dewatering Polymer Calculator - Belt Press Sizing
Determine polymer conditioning dosage (lbs/dry ton), dewatered cake production (wet tons/day), filtrate capture efficiency, and operational chemical operating costs.
Sludge Thickener Sizing Calculator - Gravity Flux Solids
Size municipal and industrial gravity sludge thickeners: calculate required tank surface area, circular diameter, solids flux loading (lb/ft²·day), and thickened underflow volume.
Sludge Volume Index SVI Calculator - Settleability & MLSS
Compute SVI in mL/g from 30-minute settleometer jar tests and mixed liquor suspended solids (MLSS), diagnose filamentous bulking, and estimate RAS density.
Soil pH Amendment (Lime & Sulfur) Application Rate Calculator | AnythingOnline
Free soil pH amendment calculator. Compute precise lime (calcite/dolomite CCE) or elemental sulfur application rates for gardens, lawns, and farms based on soil texture.