Navy Body Fat Estimator
Estimate body fat percentage using standard US Navy circumference measurements.
Explore Additional Utilities
Period Tracker & Predictor
Track menstrual cycles, predict future period start dates, cycle phases, and typical symptom occurrences.
Fuel Efficiency Converter
Convert between miles per gallon (mpg), liters per 100km (L/105km), and km/liter conversions.
Solar irradiance — W/m² ↔ peak sun hours
Convert solar irradiance (W/m²) and daylight duration to Peak Sun Hours (PSH) and estimate daily solar panel system output.
ND Filter Stops Converter
Convert ND filter labels (ND density, optical density, and stop reduction) and calculate long exposure shutter speed compensation.
DPI Screen Density Sizing
Calculate typographic sizing differences across varying screen device densities and target DPI scopes.
Julian ↔ Gregorian Calendar
Convert between Julian Dates (JD, MJD) and standard Gregorian calendar dates with day of the year and century metrics.
Fault slip rate — mm per year ↔ recurrence interval
Determine earthquake return recurrence intervals based on tectonics fault slip rates.
Engineering Slope & Gradients
Compare elevation grades, percentage slopes, and corresponding degrees.
Text Case Converter
Swiftly switch text between UPPERCASE, lowercase, camelCase, snake_case, or Title Case.
Exposure Value (EV) & Lux Converter
Convert between EV and various shutter speed, aperture, and ISO combinations, with equivalent scene lux and EV100 references.
Body Mass Index (BMI) & Waist
Calculate Body Mass Index (BMI) and Waist-to-Height ratios to assess body composition.
Lux & Foot-Candles Photometry
Calculate architectural light levels, illuminance indexes, and foot-candle units.
Cooling & HVAC Power (BTU/h ↔ W)
Compare heating, cooling, and air conditioning power capacities with corresponding watt ratings.
QR Code Generator
Instantly render plain text streams or URLs into scalable vector QR patterns complete with sizing triggers.
Reproductive Health Tracking Suite
Track menstrual cycles, predict ovulation day, fertile windows, and estimate pregnancy due dates & milestones.
RAID capacity — disk count + size + type → usable space
Calculate usable capacity, parity overhead, and fault tolerance strategies for RAID 0, 1, 5, 6, and 10.
Stride length ↔ cadence ↔ running speed
Analyze running biomechanics: calculate speed based on cadence (SPM) and stride length.
Tire size decoder — 205/55R16 ↔ diameter ↔ width ↔ aspect
Decode metric tire specs to calculate sidewall height, total diameter, circumference, and compare speedometer error against a secondary size.
Lap speed — RPM ↔ surface speed at given diameter
Calculate lap disk surface feet per minute (SFPM) speeds to optimize pre-forming, grinding, and polishing.
Turn time — underwater distance ↔ dolphin kicks needed
Optimize turn transitions by modeling underwater breakout distance, speed decay, and number of dolphin kicks.