Dimensional Weight ↔ Chargeable Weight
Calculate and compare shipping dimensional weight against actual weight to find the chargeable billing weight.
Dim weight pricing applies to large, light parcels where shipping charges are billed based on space occupied rather than weight alone. Minimize box sizes to save cost!
Explore Additional Utilities
Trim speed ↔ bar pressure — speed system calibration
Calibrate speedbar travel, resulting airspeed increase, and required bar pressure.
Fuel burn rate — engine HP ↔ liters per hour
Calculate marine engine fuel consumption (liters/hr or gal/hr) using Brake Specific Fuel Consumption (BSFC) or standard marine power constants.
Cable loss — frequency + length → signal attenuation
Estimate transmission line losses and remaining signal power for standard coaxial cables and optical fiber spans.
Braille Translator (Grade 1)
Convert standard text into visual Grade 1 Braille cell dots, and design custom cells using an interactive 6-dot braille builder.
Cooling & HVAC Power (BTU/h ↔ W)
Compare heating, cooling, and air conditioning power capacities with corresponding watt ratings.
Navy Body Fat Estimator
Estimate body fat percentage using standard US Navy circumference measurements.
Concrete strength — MPa ↔ psi ↔ N/mm²
Convert concrete compressive strength between MPa, psi, and N/mm². View typical application guidelines and concrete classes.
Grout coverage — tile size ↔ joint width → bags needed
Estimate dry grout requirements based on tile dimensions, joint width, joint depth, and overall surface area.
Flash Guide Number Calculator
Solve the photography flash equation to find guide numbers, aperture, subject distance, or ISO speed for perfect manual flash exposures.
Electron volts ↔ joules ↔ nanometers — photon energy
Convert between photon energy (eV, Joules) and physical wavelengths (nm, pm) or frequency (THz).
Heat flux — watts per square meter ↔ BTU/hr·ft²
Convert heat transfer rates per unit area between W/m², kW/m², BTU/hr·ft², and cal/s·cm².
Industrial & Tire Pressure Gauges
Convert heavy industrial or automotive pressure indicators across PSI, bar, kPa, and atm indexes.
Entropy bits ↔ password strength — character set + length
Calculate Shannon entropy bits based on character pool variety and length. Estimate brute-force resistance across various threat models.
Roman Numeral Converter
Convert between classical Roman numerals (XIV, MCMLXX) and decimal integers dynamically.
Pediatric Dosing Calculator
Estimate pediatric dosages from adult recommendations using standard pediatric clinical rules: Clark's, Young's, Webster's, Fried's, and BSA methods.
Gear ratio (input RPM ↔ output RPM ↔ torque)
Calculate gear ratios and convert input RPM and torque to output values based on compound single or double-stage tooth configurations.
Shorthand speed — words per minute ↔ strokes
Analyze cursive shorthand writing velocities (Gregg, Pitman, Teeline) to compare stroke density limits and WPM targets.
Standing timber volume — DBH + height → cubic meters
Calculate merchantable standing timber volume in cubic meters or board feet using Doyle, Scribner, or International rules.
Vibration Converter (d ↔ v ↔ a)
Convert sinusoidal mechanical vibration parameters between displacement, velocity, and acceleration at a given frequency.
Chlorophyll concentration ↔ water color index
Convert Chlorophyll-a bio-concentrations (mg/m³) to ocean water color classes, Forel-Ule index, and trophic status.