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
Salinity — PSU ↔ g/kg ↔ % — seawater concentration
Convert between Practical Salinity Units (PSU), salinity concentration in g/kg (ppt ‰), and percentage (%).
Signature count — total pages ↔ sheets per signature
Divide book blocks into balanced signatures and calculate standard folded sheet configurations.
Body Surface Area (BSA) Calculator
Calculate body surface area (BSA) for clinical dosing using Mosteller, DuBois, Haycock, and Gehan-George formulas.
Paper size ↔ finished model size — origami scaling
Determine required starting paper square dimensions to fold specific final 3D origami model sizes.
Sound Pressure Level (SPL) Converter
Convert sound pressure from Pascals (Pa) to decibels (dB SPL) and calculate distance attenuation or sound level summing.
Sidereal Time Converter
Convert between standard Solar Time and Sidereal Time based on your longitude.
Sail area ↔ displacement ratio
Calculate Sail Area to Displacement Ratio (SADR) to evaluate a sailboat’s performance characteristics, speed potential, and light-wind capability.
Becquerel ↔ curie (Activity)
Convert between Becquerels (Bq), Curies (Ci), rutherfords, and decay rates to evaluate isotope source strengths and nuclear decay events.
Ore Grade & Concentration Converter
Convert mineral grade concentrations between grams per ton (g/t), weight percentage (%), troy ounces per ton (oz/st), and ppm.
Visual Acuity Converter
Convert visual acuity measurements between Snellen US (20/20), Snellen Metric (6/6), decimal, LogMAR, and Percentage systems.
Carat weight ↔ grams
Convert between diamond or gemstone carats, metric grams, grains, and points of gem weight.
Drug Concentration Converter
Convert pharmaceutical concentrations between % w/v, mg/mL, and mol/L using substance molecular weight presets.
Feed conversion ratio — feed weight ↔ fish weight gain
Determine feed efficiency (FCR), specific growth rate, and economic cost per kg of fish biomass gain.
Ballistic coefficient ↔ drag — projectile performance
Calculate bullet Sectional Density (SD) and Ballistic Coefficient (BC) using projectile weight, caliber, and form factor.
Telescope Magnification Calculator
Calculate telescope magnification, exit pupil, and resolving limit from focal lengths and aperture.
Livestock Live Weight ↔ Carcass Yield
Estimate hot carcass weight (HCW), dressing percentage, and final retail cut take-home meat yield for beef, pork, lamb, and goat.
Wing loading — pilot weight + gear ↔ glider area
Calculate paraglider wing loading in kg/m² to determine wing dynamics and agility.
Wick size ↔ container diameter — burn pool coverage
Find recommended wick sizes based on container diameter, wax type, and burn pool coverage guidelines.
Length Converter
Convert between meter, kilometer, centimeter, mile, yard, foot, inch, and more.
Grout coverage — tile size ↔ joint width → bags needed
Estimate dry grout requirements based on tile dimensions, joint width, joint depth, and overall surface area.