Flash Guide Number
Solve the manual flash formula relating guide numbers, ISO, subject distance, and aperture.
Based on manual photographic flash physics formula: GN = Distance × Aperture (referenced at ISO 100).
Explore Additional Utilities
Servo angle ↔ PWM pulse width
Convert between servo rotation angle in degrees and standard PWM pulse width in microseconds, with continuous rotation presets.
Speaker coverage — wattage ↔ room size ↔ SPL
Calculate audience continuous and peak decibel sound pressure levels based on amplifier power, distance, and sensitivity.
Script Character ↔ Word Counter
Analyze characters, spaces, punctuation, words, and word density. Convert text density predictions between CJK and Latin scripts.
Hijri ↔ Gregorian Calendar
Convert between Islamic Hijri calendar and standard Gregorian dates, with customized crescent visibility observation adjustments.
Ore dilution — grade ↔ waste ↔ recovered grade
Calculate recovered ore grade, tonnage adjustments, dilution percentages, and mining waste contamination levels.
Lap speed — RPM ↔ surface speed at given diameter
Calculate lap disk surface feet per minute (SFPM) speeds to optimize pre-forming, grinding, and polishing.
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.
Ovulation & Fertility Calculator
Predict ovulation day, fertile window phases, and estimate conception probabilities.
Crease pattern scale — diagram size ↔ actual paper needed
Scale geometric origami crease patterns and tessellations to starting square sheet sizes.
Brood frame count ↔ colony population estimate
Convert frame counts of capped brood to estimate total emerging colony population and overall workforce strength.
Arrow spine ↔ draw weight + length — stiffness matching
Estimate required arrow static spine rating (stiffness) based on bow draw weight, arrow length, and bow type.
Clinical Blood Pressure Gauges
Compare clinical medical blood pressure or vacuum values between mmHg and kPa units.
Soil Plasticity Index Calculator
Calculate Plasticity Index (PI) from Liquid Limit (LL) and Plastic Limit (PL), and interpret soil state using the Atterberg limits chart.
Carbonation volumes ↔ CO2 pressure ↔ temperature
Compute carbonation volumes of CO2 or determine draft regulator PSI settings based on storage temperature.
Handicap index ↔ course handicap — golf scoring
Translate USGA/R&A Handicap Index to Course Handicap with slope rating and course rating adjustments.
Glass thickness ↔ wind load — structural glazing
Calculate structural glass pane thickness required to withstand architectural wind load pressures.
URL Encoder & Decoder
Safely encode illegal URL string sequences or decode clean string paths.
AWG Cable Sizer
Convert American Wire Gauge (AWG) sizes to metric dimensions, and estimate current carrying capacity.
Wax yield — honey weight ↔ beeswax produced
Calculate estimated beeswax yields as a function of harvested honey comb or calculate honey consumption needed to build wax.
Feed conversion ratio — feed weight ↔ fish weight gain
Determine feed efficiency (FCR), specific growth rate, and economic cost per kg of fish biomass gain.