Seismology & Earthquakes
Seismological Settings
Explore Additional Utilities
Reading & Speaking Timer
Convert total word counts to estimated reading or speaking time at standard speeds.
Bullet drop — distance ↔ inches ↔ cm at given range
Estimate bullet drop trajectories over distance based on muzzle velocity, projectile mass, and gravitational pull.
Refrigerant charge — system size ↔ kg of refrigerant
Estimate split system factory and added line set refrigerant charge adjustments using liquid tube diameters.
Ore dilution — grade ↔ waste ↔ recovered grade
Calculate recovered ore grade, tonnage adjustments, dilution percentages, and mining waste contamination levels.
Pipe nominal size ↔ actual OD — NPS vs DN standards
Cross-reference standard Nominal Pipe Sizes (NPS) with Diameter Nominal (DN), wall thickness, and outer diameter measurements.
Responsive Font Units Converter
Compute points, pixels, em, rem web font guidelines, and equivalent font sizes.
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.
Roman Numeral Converter
Convert between classical Roman numerals (XIV, MCMLXX) and decimal integers dynamically.
Clothing Size Converter
Convert apparel sizes (XS to 3XL) across US, UK, European, and Asian standards.
NATO Phonetic Alphabet
Spell out commands or names phonetically using the standard military/aviation phonetic alphabet.
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.
Electron volts ↔ joules ↔ nanometers — photon energy
Convert between photon energy (eV, Joules) and physical wavelengths (nm, pm) or frequency (THz).
Drain slope — mm per meter ↔ inches per foot
Convert drainage slope units and calculate vertical height drops across horizontal sewage pipes run lengths.
Preservative usage rate — product weight ↔ grams needed
Determine exact weight additions of cosmetic-grade preservatives in grams based on batch specifications.
Frequency ↔ wavelength — antenna length calculation
Determine electromagnetic wavelength from frequency and velocity factors. Get recommended quarter-wave and half-wave antenna lengths.
Original gravity ↔ potential ABV — beer brewing
Calculate alcohol by volume (ABV), attenuation percentages, and calorie estimations from Original and Final Gravity values.
Shoe Size Converter
Convert footwear sizes across US, UK, Europe, and Japanese standards for men and women.
Yeast pitch rate — batch volume + gravity → grams of yeast
Determine required yeast cell counts and dry yeast weight based on batch volume, wort gravity, and target pitch rates.
Planck units ↔ SI units — fundamental physics constants
Translate between SI physical units and the fundamental Planck natural units based on universal constants.
Julian ↔ Gregorian Calendar
Convert between Julian Dates (JD, MJD) and standard Gregorian calendar dates with day of the year and century metrics.