Seismology & Earthquakes
Seismological Settings
Explore Additional Utilities
Crown position ↔ function — hand setting vs winding
Map out the mechanical state and winding functions of crowns at positions 0, 1, and 2, including quickset dates and hacking.
US Inflation Adjuster
Evaluate historical purchasing power changes in the United States using official CPI records.
Narcosis depth — nitrogen % ↔ equivalent air depth
Calculate Equivalent Narcotic Depth (END) and Equivalent Air Depth (EAD) for nitrox and trimix gas breathing mixtures.
Semaphore flag positions ↔ letters
Map letters to naval Semaphore flag clock angles and visualize the exact left/right arm positions interactively.
Mechanical Power (W ↔ hp)
Convert physical engine horsepower ratings, mechanical draft forces, and electric wattages.
Mohs Hardness & Scratch Resistance
Compare minerals, absolute hardness values, and scratch interactions using the classic 1-10 Mohs scale and Knoop indentation hardness.
Cloud Base Height Estimator
Estimate cloud condensation levels and cloud base height based on temperature and dewpoint spreads.
Knitting Gauge Converter
Convert knitting and crochet stitches and rows count between centimeters and inches.
Sail area ↔ displacement ratio
Calculate Sail Area to Displacement Ratio (SADR) to evaluate a sailboat’s performance characteristics, speed potential, and light-wind capability.
True wind ↔ apparent wind
Calculate apparent wind speed and angle from true wind speed, sailing angle, and boat speed (or vice versa).
Servo angle ↔ PWM pulse width
Convert between servo rotation angle in degrees and standard PWM pulse width in microseconds, with continuous rotation presets.
Navy Body Fat Estimator
Estimate body fat percentage using standard US Navy circumference measurements.
Shoe Size Converter
Convert footwear sizes across US, UK, Europe, and Japanese standards for men and women.
Cooling & HVAC Power (BTU/h ↔ W)
Compare heating, cooling, and air conditioning power capacities with corresponding watt ratings.
Length Converter
Convert between meter, kilometer, centimeter, mile, yard, foot, inch, and more.
Wind Turbine Power Generator
Estimate power output (watts) of a wind turbine based on wind speed, rotor diameter, blade sweep area, and aerodynamic power coefficients.
Thread Weight Converter
Convert between different thread sizing standards including Tex, Denier, and Number English (Ne).
Equatorial Coordinates Converter
Convert Right Ascension (RA) and Declination (Dec) to Hour Angle and Alt-Azimuth coordinates.
Base64 Encoder
Encode textual strings to Base64 format, or decode Base64 back to raw text.
dB gain ↔ power ratio — amplifier and antenna specs
Convert logarithmic decibels (dB) to linear power and voltage ratios, or translate absolute power in Watts to dBm.