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McCabe-Thiele Calculator: Stages and Minimum Reflux
Design a binary distillation column with real ethanol–water VLE, azeotrope limits, animated stage stepping, minimum reflux, and Fenske–Underwood–Gilliland comparisons.
Drinking-Water Chlorine CT and Contact Tank Calculator
Calculate chlorine CT, T10 from a baffling factor, required contact-tank volume and maximum flow. Compare a Giardia log target with EPA tables and explore an illustrative tracer response.
Cooling Tower Makeup Water and Cycles of Concentration
Calculate cooling tower evaporation, drift, blowdown and makeup water. Compare cycles of concentration with an LSI scaling screen, range and approach.
Air Compressor Size, Receiver Tank and Leak Cost Calculator
Size compressor free-air delivery and receiver storage from demand, duty cycle and pressure band. Estimate leak flow and electricity cost at your tariff.
Water Softener Size Calculator: Salt and Regeneration
Size a resin bed from hardness, iron and water demand. Compare salt doses, regeneration intervals, yearly salt and water use, and sodium added.
Sprayer Calibration Calculator & Spray Drone Coverage
Calculate nozzle flow from pressure, spray application rate and tank loads. Plan a spray drone field path, battery swaps and effective hectares per hour.
Septic Tank Size Calculator, Drain Field & Pump-Out Interval
Estimate septic tank capacity, drain field size and pump-out timing. Compare published maintenance intervals with sludge and scum growth, with metric and US units.
Hydroponic Nutrient Calculator: Salt Weights, ppm and EC
Calculate macronutrient salt weights, compare target and achieved elemental ppm, plan separate A/B stocks, and estimate EC from the dissolved ions.
Greenhouse Heat Loss & Ventilation Calculator: 24-Hour Climate
Model greenhouse temperature over 24 hours with solar gain, shade, fan ventilation, evaporative pads and heating. Compare heat loss and cooling capacity.
Drip Irrigation Calculator: Lateral Length & Uniformity
Calculate pressure and emitter flow along a sloping drip lateral. Find the maximum line length that meets emission uniformity and operating-pressure limits.
Fertilizer Calculator: NPK Blend and Rate Planner
Blend two or three mineral fertilizers to match an N–P₂O₅–K₂O target. Compare cost, excess nutrients, nitrogen limits and split application doses.
FAO-56 Irrigation Scheduler: ET, Soil Water and Run Time
Calculate grass-reference evapotranspiration, crop water use, soil depletion and sprinkler or drip run time. Explore a daily FAO-56 water balance across a growing season.
Grain Bin Capacity, Aeration Fan and Drying Time
Estimate grain bin capacity with a peaked cone and packing. Match corn resistance to a fan curve, calculate water shrink, and explore a rising drying front.
Pot Still ABV Calculator: Run Simulator and Cuts
Simulate ethanol–water pot still ABV over time using Rayleigh batch distillation. Watch the boiler empty and compare heads, hearts, and tails for education and licensed distilling.
Sous Vide Pasteurization Time and Core Temperature
Estimate sous vide time by thickness and shape. Compare core warming, accumulated Listeria log reduction, and a conservative come-up-plus-hold schedule.
Fermenter Cooling and Glycol Chiller Sizing
Size a brewery glycol chiller from fermentation heat, crash cooling and cold holding. Compare staggered tank loads, check jacket UA and estimate glycol flow.
Brewing Water Calculator and Mash pH Planner
Plan mash salts and acid with a transparent malt-buffer model. See the titration-curve intersection, residual alkalinity and a typical ±0.15 pH planning band.
Keg Line Length & Carbonation Calculator | Draft Balancer
Balance keg carbonation, CO₂ regulator pressure and beer line length using flow-dependent friction. Includes altitude, warming, foam-risk profiles, bottle priming sugar and ABV.
Alcohol Dilution Calculator — Spirit Proofing
Calculate water needed to proof spirits, accounting for volume contraction or expansion and hydrometer temperature correction. Use ABV or US proof, with metric or US units.
Helmholtz Resonator Calculator: Bass Traps, Exhausts, Bottles
Calculate Helmholtz resonance with neck end corrections, damping and half-power bandwidth. Size a cavity for a target tone and explore bass traps, bottles and exhaust resonators.
Wind Chime Length, Marimba Bar and Tubular Bell Calculator
Size tubes, rods and marimba bars for a musical note. Find hang points, compare overtones, explore undercut tuning and animate free-free bending modes.
Arc-Flash Incident Energy and Boundary (IEEE 1584-2018)
Arcing current, incident energy and arc-flash boundary of a three-phase 208 V to 15 kV equipment by the IEEE Std 1584-2018 empirical model, with the arcing current variation.
Wall Sound Insulation Calculator: Mass Law, Double Walls & Leaks
Estimate wall transmission loss, mass–air–mass resonance, coincidence dips and the effect of openings. Compare single and separated double leaves with approximate STC/Rw ratings.
Rotor Sail Thrust and Route Fuel Saving
Estimate Flettner rotor thrust, electrical demand and route fuel savings from three wind conditions. Includes a thrust polar plot and animated Magnus-effect schematic.
