Lap Surface Speed SFPMLapidary Guild
Calculate surface velocity (SFPM) at different points on grinding and polishing laps based on disk diameter and RPM.
Velocity Match Advice
Fine Faceting & Pre-polishing
Explore Additional Utilities
Sink rate — airspeed ↔ altitude loss per minute
Calculate glider sink rate in knots or m/s from airspeed and polar parameters, yielding altitude loss rate.
Radioactive Decay Half-Life
Estimate remaining isotope amounts and decay timelines from standard half-life periods.
Bleed & Margin Helper
Convert print bleed and margins, and calculate print-ready canvas sizes for offset printing.
JSON Formatter
Format, validate, beautify, and minify your JSON data structures in real-time.
Barometric Altimeter Settings
Calibrate pressure settings between QNH and QFE based on airfield elevation and temperature.
Cooling & HVAC Power (BTU/h ↔ W)
Compare heating, cooling, and air conditioning power capacities with corresponding watt ratings.
Nautical Distance & Speed Sizer
Convert distances between nautical miles, statute miles, and kilometers, and calculate knot-based speeds.
Lux & Foot-Candles Photometry
Calculate architectural light levels, illuminance indexes, and foot-candle units.
Engine displacement — cc ↔ cubic inches ↔ liters
Convert and calculate total engine volume in cc, cubic inches, and liters using cylinder bore, piston stroke, and cylinder count.
Key length ↔ security bits — RSA vs AES equivalence
Compare security levels (bits of security) across symmetric keys, RSA, and Elliptic Curve Cryptography (ECC) based on NIST standards.
Ovulation & Fertility Calculator
Predict ovulation day, fertile window phases, and estimate conception probabilities.
Original gravity ↔ potential ABV — beer brewing
Calculate alcohol by volume (ABV), attenuation percentages, and calorie estimations from Original and Final Gravity values.
Render thickness ↔ coverage per bag
Determine dry render mix weight and bag counts for a target wall area and application thickness. Assess single bag yields.
Gelatin & Agar Agar Converter
Convert between gelatin sheets (platinum, gold, silver, bronze), powdered gelatin, and vegan agar agar.
Battery capacity — Ah ↔ Wh ↔ days of autonomy
Convert between Amp-hours (Ah) and Watt-hours (Wh) and calculate battery bank backup days of autonomy based on loads.
Navy Body Fat Estimator
Estimate body fat percentage using standard US Navy circumference measurements.
Alcohol by Volume & Proof Converter
Convert between alcohol by volume (ABV), proof, and standard alcohol units for drinks and home brewing.
Nail size — penny (d) ↔ mm ↔ inches length
Convert traditional penny (d) nail sizes to absolute physical lengths in millimeters and inches, including standard shank gauge and nail types.
Morse code ↔ NATO phonetic — dual encoding
Convert raw text into international Morse Code (DITs and DAHs) and official NATO spelling phonetics synchronously.
Bohr radius ↔ nanometers — atomic scale reference
Determine electron orbital radius and binding energy levels for Hydrogen-like atomic configurations.