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.
Optical Density
Convert between Optical Density (OD), transmittance fraction/percentage, and attenuation factor for laser safety filters.
Safety Filter Inputs
Optics Engineering Report
Real-time Physics"Class 3B lasers, medium power laboratory/alignment diagnostics."
Explore Additional Utilities
Stride length ↔ gait (Walk, Trot, Canter, Gallop) strides per minute
Convert between horse stride length, gait speeds, and strides per minute (cadence).
Water cement ratio ↔ compressive strength
Estimate 28-day concrete compressive strength from the water-cement (W/C) ratio using Abrams' Law, or solve for desired strengths.
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.
Wave height ↔ wave period — sea state description
Assess Significant Wave Height, period, WMO sea states, wave wavelength, celerity speed, and steepness limits.
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.
MAC address formats — colon ↔ hyphen ↔ Cisco notation
Convert physical MAC addresses between IEEE colon, hyphen, Cisco dot format, and raw hex strings.
Bandwidth ↔ throughput — theoretical vs real world
Compare absolute Shannon-Hartley channel capacity limits against expected TCP throughput using packet loss and round-trip times.
Sugar Syrup Ratio Calculator
Calculate water and sugar ratios for simple, rich, and Demerara syrups by volume and weight.
Speech Rate (WPM ↔ Pages)
Calculate presentation speech times, audio length, and page count equivalents using custom words per minute (WPM).
Chemical Solutions Concentration
Convert chemical solutions concentration (Molarity ↔ Molality ↔ PPM) and analyze mass ratios.
Yarn Weight Converter
Convert yarn sizes across WPI (Wraps Per Inch), ply, and standard weight categories.
Pallet Configuration (Boxes/Pallet)
Optimize pallet loading layouts by calculating maximum box stacking of specified dimensions onto standard pallet sizes.
Elastic Stretch Ratio Calculator
Calculate the stretch percentage and relaxed vs. stretched lengths of elastics or stretch fabrics.
Specific heat capacity — J/kg·K ↔ BTU/lb·°F
Convert between specific heat capacity units including J/kg·K, kJ/kg·°C, BTU/lb·°F, and cal/g·°C.
Hallmark converter (UK date letters ↔ year)
Decode historic and modern UK silver, gold, and platinum hallmarks, converting assay office date letters to exact production years.
Cloud Base Height Estimator
Estimate cloud condensation levels and cloud base height based on temperature and dewpoint spreads.
Nail size — penny (d) ↔ mm ↔ inches length
Convert traditional penny (d) nail sizes to absolute physical lengths in millimeters and inches, including standard shank gauge and nail types.
Carbon Footprint Calculator
Convert between distance driven (km or miles) and greenhouse gas emissions (kg CO2) across various vehicle fuel types and efficiencies.
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.
Enthalpy ↔ temperature ↔ pressure — steam tables
Estimate saturated water and steam properties including boiling point, saturated pressure, and enthalpies.