Geotechnical & Soil Lab
Convert soil bearing capacities, calculate loose-compacted volumes, model groundwater hydraulic flow with Darcy\'s Law, interpret Atterberg limits, and run USCS sieve classifications.
Bearing Capacity
Convert soil bearing capacities between Kilopascals (kPa), Tons/sq ft (tsf), Pounds/sq ft (psf), and kg/cm² with safety factor calculators.
Explore Additional Utilities
Propeller pitch ↔ boat speed — theoretical boat speed
Calculate theoretical boat speed and actual speed based on propeller pitch, engine RPM, gear ratio, and hull slip percentages.
Line length ↔ kite steering response — pivot arc
Analyze steering response lag and turning pivot arc diameter based on line length.
Tanning solution strength — hide weight ↔ chemical ratio
Calculate tanning agent concentrations, water ratios, and oil emulsions needed based on cured hide weight.
Roving weight ↔ finished yarn yardage estimate
Calculate expected yarn yardage from roving mass based on target spinning grist (yards per pound or run).
Retention aid — filler % ↔ chemical dosage
Determine required dry retention aid chemical dosage and mineral filler weights based on dry pulp fiber mass.
Cabochon dome height ↔ base diameter ratio
Calculate cabochon dome proportions, bezel edge thickness, and curvature radii based on base shapes.
Pattern scaling — original size ↔ scaled dimensions
Scale sewing and cutting patterns up or down uniformly. Convert dimensions between source and target sizes.
Dye concentration — leather area ↔ product needed
Estimate leather dye volume needed based on total surface area, coat layers, and color reduction ratios.
Bit size — horse mouth width ↔ mm/inch measurement
Convert horse mouth width measurement to proper bit sizing in inches, centimeters, and millimeters with clearance safety margins.
Soil Plasticity Index Calculator
Calculate Plasticity Index (PI) from Liquid Limit (LL) and Plastic Limit (PL), and interpret soil state using the Atterberg limits chart.
Tolerance converter (ISO fit classes ↔ clearance)
Find upper and lower deviation limits for shaft and hole ISO 286 fit classes like H7, g6, f7, and compute clearances in microns or mm.
Signature count — total pages ↔ sheets per signature
Divide book blocks into balanced signatures and calculate standard folded sheet configurations.
Sink rate — airspeed ↔ altitude loss per minute
Calculate glider sink rate in knots or m/s from airspeed and polar parameters, yielding altitude loss rate.
Nectar ↔ honey — volume reduction during curing
Calculate volume and weight reduction as bees dehydrate raw floral nectar (80% moisture) down to cured honey (18% moisture).
pH buffer amount — solution volume ↔ ml of pH up/down
Estimate the volume of phosphoric acid (pH Down) or potassium hydroxide (pH Up) needed to adjust nutrient water reservoirs.
Prism Power Converter
Convert ophthalmic prism power between prism diopters (PD) and degrees of deviation, with light bending estimations.
Vibration Converter (d ↔ v ↔ a)
Convert sinusoidal mechanical vibration parameters between displacement, velocity, and acceleration at a given frequency.
Adhesive ratio — PVA ↔ paste ↔ water formulation
Formulate custom bookbinding adhesive mixtures (polyvinyl acetate and wheat starch paste) for perfect open time and flexibility.
Cadence ↔ speed — gear ratio + RPM → km/h
Determine speed based on cadence (RPM), chainring/cog teeth counts, and tire circumference.
Visibility — Secchi depth ↔ water clarity rating
Estimate underwater horizontal visibility and water quality indices using standard Secchi disk depth readings.