Jewel Count GuideWatchmaking & Horology
Explore movement bearing counts from 1 to 30+ jewels. See where rubies are placed and how they reduce mechanical friction.
Calculations derived from Swiss and Japanese chronometric engineering standards. Always refer to your watch movement user manual to avoid shearing delicate calendar teeth or stripping winding stems.
Standard full complement of jewels protecting the crucial balance wheel staff, escapement pallet, fork, and gear train train.
Explore Additional Utilities
Engine power ↔ hull speed — planing vs displacement
Estimate maximum displacement hull speeds (LWL formula) or calculate planing hull speeds using Crouch's classic marine formula.
Saponification value — oil type ↔ lye required per gram
Look up sap values for standard oils and calculate custom lye weights.
Tank pressure ↔ volume ↔ dive time — SAC rate
Calculate Surface Air Consumption (SAC) rate, gas consumption, and remaining dive time based on cylinder volume and depth.
Dimensional Weight ↔ Chargeable Weight
Calculate shipping dimensional weight based on L x W x H using standard carrier factors, and determine final chargeable weight.
Pulp consistency — dry fiber % ↔ water ratio
Calculate dry fiber weight percentage in wet pulp slurry and water mixing dilution ratios for vat dipping.
Pregnancy Due Date & Milestones
Calculate estimated due date (EDD), gestational age, fetal development sizes, and trimester milestones.
Plying angle ↔ yarn strength — twist balance
Calculate optimal twist plying angles, yarn twist multipliers, and balance criteria to spin stable structured yarns.
Salinity — PSU ↔ g/kg ↔ % — seawater concentration
Convert between Practical Salinity Units (PSU), salinity concentration in g/kg (ppt ‰), and percentage (%).
Thermohaline density — temperature + salinity → seawater density
Determine seawater density and specific volume from water temperature and salinity using the UNESCO International Equation of State.
Turn time — underwater distance ↔ dolphin kicks needed
Optimize turn transitions by modeling underwater breakout distance, speed decay, and number of dolphin kicks.
Decompression stop — depth + time → stop obligation
Estimate decompression stop obligations, no-decompression limits (NDL), and ceiling depths based on depth and bottom time.
Colony weight gain — nectar flow ↔ kg per day estimate
Estimate the daily hive weight gain from raw floral nectar inflow and final cured honey production.
Ocean depth ↔ pressure — bar per 10 meters rule
Calculate hydrostatic and total pressure in the ocean based on depth, water density, and gravity constants.
Aviation Fuel Weight Calculator
Calculate volume-to-weight changes for standard aviation fuels (Jet A-1, Avgas) across metric and imperial systems.
Color rod weight ↔ color intensity in clear glass
Calculate required color rod weights to achieve target color intensity saturation levels in clear glass gathers.
BBQ Smoking Wood Quantity Calculator
Calculate the optimal quantity of smoking wood chunks or chips needed based on meat weight and type.
Barometric Altimeter Settings
Calibrate pressure settings between QNH and QFE based on airfield elevation and temperature.
Text Case Converter
Swiftly switch text between UPPERCASE, lowercase, camelCase, snake_case, or Title Case.
Speech Rate (WPM ↔ Pages)
Calculate presentation speech times, audio length, and page count equivalents using custom words per minute (WPM).
Explosive charge weight — rock volume ↔ kg of explosive
Estimate required explosives (kg, lbs) for blasting a rock volume using powder factor models for open-pit mining.