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.
Compaction Ratio
Convert between bank, loose, and compacted volumes of soil, using swell and shrinkage factors for civil earthwork calculations.
Explore Additional Utilities
Twist rate — caliber ↔ bullet length → stabilization
Calculate the optimal barrel rifling twist rate needed to stabilize a bullet of a given length, caliber, and velocity.
Specific heat capacity — J/kg·K ↔ BTU/lb·°F
Convert between specific heat capacity units including J/kg·K, kJ/kg·°C, BTU/lb·°F, and cal/g·°C.
NATO Phonetic Alphabet
Spell out commands or names phonetically using the standard military/aviation phonetic alphabet.
Dew point ↔ condensation risk — wall insulation check
Check wall surface dew point parameters and assess condensation and mold growth risks from room relative humidity.
Capacitor & Inductor Codes
Convert between capacitance and inductance units, and decode SMD/3-digit codes.
Electricity Billing (kWh ↔ MJ)
Analyze electric billing kilowatt-hours and physical energy auditing megajoule metrics.
NPK Fertilizer Blend Designer
Calculate exact commercial fertilizer weights (Nitrogen, Phosphate, Potash) required to hit crop nutrient targets.
Paper Size Comparer
Convert standard paper formats (A4, Letter, Legal, A3) in mm/inches and visually compare overlap.
Marine Fuel Consumption Estimator
Estimate marine engine fuel consumption in liters per hour at given RPM values using theoretical propeller law curves.
Pipe thread standard — NPT ↔ BSP ↔ metric
Compare dimensions, angles, thread pitches, and sealing mechanics of NPT, BSPP, BSPT, and Metric thread systems.
Exposure Triangle & F-Stop
Calculate absolute stop adjustments, exposure reciprocal tradeoffs, f-stop quotients, and ISO noise tradeoffs.
High-Altitude Baking Adjustments
Adjust bread/pastry structures for high altitude low atmospheric pressure.
GPS Format Converter
Convert global latitude and longitude between Decimal Degrees (DD) and Degrees Minutes Seconds (DMS).
De Broglie wavelength — particle mass + velocity → wavelength
Calculate quantum mechanical wavelengths for matter waves under both classical and relativistic velocities.
Shoe Size Converter
Convert footwear sizes across US, UK, Europe, and Japanese standards for men and women.
Mechanical Power (W ↔ hp)
Convert physical engine horsepower ratings, mechanical draft forces, and electric wattages.
Lumens & Bulb Wattage Equivalence
Compare light outputs in lumens with electrical consumption in bulb watts.
Semaphore flag positions ↔ letters
Map letters to naval Semaphore flag clock angles and visualize the exact left/right arm positions interactively.
ISO Week Number ↔ Calendar Date
Calculate ISO 8601 week numbers, week dates, and determine start/end weekdays of any given week year.
Paper weight — gsm ↔ lb bond ↔ lb cover ↔ lb text
Convert paper weights between Grams per Square Meter (GSM) and standard US basis weights (Bond, Text/Book, Cover).