Case Size & Lug GuideWatchmaking & Horology
Analyze watch case diameter proportions, lug-to-lug spans, and find the corresponding standard strap lug-width sizes.
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.
Perfect classic mechanical sizing. Balanced case footprint for supreme wear comfort.
Explore Additional Utilities
Concrete strength — MPa ↔ psi ↔ N/mm²
Convert concrete compressive strength between MPa, psi, and N/mm². View typical application guidelines and concrete classes.
Wind chill at altitude — temperature + wind → effective cold
Calculate altitude wind chill index, frostbite time, and standard temperature lapse rates.
Irrigation Flow & Volume Sizer
Convert water flow rates, and calculate irrigation water depths and volumes over target agricultural land.
Audio File Size & Sample Rate
Compute uncompressed audio files size based on sample rate, bit depth, and duration.
Cheese Yield & Rind Calculator
Estimate the edible cheese yield and rind weight waste for whole wheels and wedges of various cheese types.
US Inflation Adjuster
Evaluate historical purchasing power changes in the United States using official CPI records.
Inverter sizing — load watts ↔ VA rating needed
Analyze total AC continuous and surge loads to specify the ideal inverter Volt-Amp (VA) and wattage ratings.
Clothing Size Converter
Convert apparel sizes (XS to 3XL) across US, UK, European, and Asian standards.
Currency Converter
Convert global currencies using simulated or fetched live rates (USD, EUR, GBP, JPY, etc.).
Original gravity ↔ potential ABV — beer brewing
Calculate alcohol by volume (ABV), attenuation percentages, and calorie estimations from Original and Final Gravity values.
Air changes per hour — room volume ↔ fan capacity
Evaluate active ventilation air changes per hour (ACH) based on blower CFM capacity and physical room volume.
Speech Rate (WPM ↔ Pages)
Calculate presentation speech times, audio length, and page count equivalents using custom words per minute (WPM).
Standing timber volume — DBH + height → cubic meters
Calculate merchantable standing timber volume in cubic meters or board feet using Doyle, Scribner, or International rules.
Viscosity — cosmetic grade cps ↔ product texture description
Map centipoise (cPs) values to tangible product textures and view standard cosmetic grade shear behaviours.
Electrode size ↔ amperage range — stick welding
Match stick electrode sizes (3/32", 1/8", 5/32") and classes (E7018, E6010, E6013) with optimal welding amperage ranges.
DPI / PPI Converter
Convert image pixel dimensions into physical print sizes (inches/cm) at any target resolution.
Hebrew ↔ Gregorian Calendar
Convert between the Hebrew lunisolar calendar and standard Gregorian dates, detailing standard Jewish months, holidays, and leap years.
Heat Index Feels-Like
Assess felt air heat indexes using ambient temperature and relative humidity thresholds.
Tree diameter ↔ basal area — forestry measurement
Convert tree breast height diameters to single tree basal area or estimate stand basal area densities per acre or hectare.
Drilling rate — ROP in m/hr ↔ ft/hr
Translate Rate of Penetration (ROP) and calculate specific drilling time, drilling speed efficiency, and shift performance.