Optics & Laser Calculators
Convert laser divergence angles to target spot sizes, measure hazardous power density concentration levels, evaluate optical density transmittance safety margins, design TIR fiber cores, and compute coupler Numerical Apertures.
Beam Divergence
Calculate laser spot diameter at a distance based on beam divergence angle (mrad/degrees) and initial aperture waist.
Beam Specifications
Optics Engineering Report
Real-time PhysicsTarget Spot Size (Diameter)
Explore Additional Utilities
Rope breaking strength — diameter ↔ material ↔ load rating
Estimate minimum breaking strength (MBS) and safe working load (SWL) based on line diameter, material (Dyneema, Nylon, etc.), and safety factors.
Knitting Gauge Converter
Convert knitting and crochet stitches and rows count between centimeters and inches.
Pregnancy Due Date & Milestones
Calculate estimated due date (EDD), gestational age, fetal development sizes, and trimester milestones.
Hash output size — MD5 ↔ SHA1 ↔ SHA256 ↔ SHA512 bits
Analyze hash function characteristics (MD5, SHA-1, SHA-2, SHA-3), including bit size, hex length, collision vulnerability, and use cases.
Viscosity — cosmetic grade cps ↔ product texture description
Map centipoise (cPs) values to tangible product textures and view standard cosmetic grade shear behaviours.
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.
Flash Guide Number Calculator
Solve the photography flash equation to find guide numbers, aperture, subject distance, or ISO speed for perfect manual flash exposures.
Electron volts ↔ joules ↔ nanometers — photon energy
Convert between photon energy (eV, Joules) and physical wavelengths (nm, pm) or frequency (THz).
Wire feed speed ↔ amperage — MIG welding settings
Calculate MIG wire feed speed (WFS) and matching amperage. Includes gas recommendations and presets for steel, stainless, and aluminum.
URL Encoder & Decoder
Safely encode illegal URL string sequences or decode clean string paths.
Speech Rate (WPM ↔ Pages)
Calculate presentation speech times, audio length, and page count equivalents using custom words per minute (WPM).
Chlorophyll concentration ↔ water color index
Convert Chlorophyll-a bio-concentrations (mg/m³) to ocean water color classes, Forel-Ule index, and trophic status.
IBU ↔ bitterness ratio — hop bitterness vs malt sweetness
Calculate the BU:GU bitterness ratio by comparing hop Bitterness (IBU) against malt sweetness (Gravity Units).
Heat Index Feels-Like
Assess felt air heat indexes using ambient temperature and relative humidity thresholds.
QR Code Generator
Instantly render plain text streams or URLs into scalable vector QR patterns complete with sizing triggers.
Electricity Billing (kWh ↔ MJ)
Analyze electric billing kilowatt-hours and physical energy auditing megajoule metrics.
Shorthand speed — words per minute ↔ strokes
Analyze cursive shorthand writing velocities (Gregg, Pitman, Teeline) to compare stroke density limits and WPM targets.
Current Speed Converter
Convert tidal, ocean, and river current speeds between knots, meters per second (m/s), and kilometers per hour (km/h).
Percentile ↔ z-score ↔ standard deviation
Determine z-scores, percentiles, standard deviation steps, and probability density for standard normal distribution curves.
International Ring Size Matcher
Compare finger size rings across US, UK, Europe, and Asian dimensions.