Optics & Vision Lab
Analyze lens focal lengths, convert clinical visual acuity fractions, compute prism deviations, simulate color temperatures, and evaluate light bulb efficacy.
Luminous Efficacy Calculator
Calculate efficacy in lumens per watt, evaluate electrical efficiency relative to theoretical maximums, and compare light bulb technologies.
13.78% of maximum physics limit (683 lm/W)
High Efficiency (Standard LED)
Outstanding modern standard. Consumes 85% less power than equivalent incandescent bulbs.
Explore Additional Utilities
Spine width — page count + paper weight ↔ mm
Calculate spine width in millimeters from page count, paper weight (gsm or basis), and cover board thickness.
De Broglie wavelength — particle mass + velocity → wavelength
Calculate quantum mechanical wavelengths for matter waves under both classical and relativistic velocities.
Frequency ↔ Wavelength (Sound)
Convert between sound frequency and wavelength in air or water, considering temperature and medium sound speed variations.
Nectar ↔ honey — volume reduction during curing
Calculate volume and weight reduction as bees dehydrate raw floral nectar (80% moisture) down to cured honey (18% moisture).
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.
Currency Converter
Convert global currencies using simulated or fetched live rates (USD, EUR, GBP, JPY, etc.).
Mechanical Power (W ↔ hp)
Convert physical engine horsepower ratings, mechanical draft forces, and electric wattages.
Pediatric Dosing Calculator
Estimate pediatric dosages from adult recommendations using standard pediatric clinical rules: Clark's, Young's, Webster's, Fried's, and BSA methods.
Beam divergence — mrad ↔ degrees ↔ spot size at distance
Calculate equivalent divergence angles and spot diameter at target plane from exit waist apertures.
Base64 Encoder
Encode textual strings to Base64 format, or decode Base64 back to raw text.
ISO Week Number ↔ Calendar Date
Calculate ISO 8601 week numbers, week dates, and determine start/end weekdays of any given week year.
Heat Index Feels-Like
Assess felt air heat indexes using ambient temperature and relative humidity thresholds.
Dovetail angle — ratio ↔ degrees for hardwood vs softwood
Convert dovetail joint slope ratios (e.g. 1:6, 1:8) to slope angles in degrees and verify hardwood/softwood suitability.
Compression ratio — bore + stroke + head volume
Calculate static compression ratios from cylinder bore, stroke, head chamber volume, gasket thickness, deck clearance, and dome/dish specs.
Cooling & HVAC Power (BTU/h ↔ W)
Compare heating, cooling, and air conditioning power capacities with corresponding watt ratings.
Scale factor (model size ↔ real world)
Convert dimensions between model design sizes and physical real-world scale targets, including imperial/metric conversions.
Ground acceleration — Gal ↔ g ↔ m/s²
Convert Peak Ground Acceleration (PGA) values among Gal, gravity fractions, and m/s².
IQ score ↔ percentile rank
Map IQ scores (with standard deviations 15 or 16) to cognitive percentile ranks, rarity indices, and standard intelligence brackets.
Sievert ↔ rem (Dose Equivalent)
Convert between Sieverts (Sv), rem, millisieverts (mSv), and millirem (mrem) to quantify biological effects and occupational radiation risk.
Dissolved oxygen — mg/L ↔ % saturation at temperature
Convert between DO mg/L and % saturation. Analyze solubility boundaries based on water temperature and salinity.