Optics & Vision Lab
Analyze lens focal lengths, convert clinical visual acuity fractions, compute prism deviations, simulate color temperatures, and evaluate light bulb efficacy.
Diopter ↔ Focal Length Converter
Convert between ophthalmic diopters (lens power) and focal length in various length units. Calculate nearsighted (myopic) or farsighted (hyperopic) lens specs.
Converging Lens (Convex / Positive)
Optical Ray Path behavior:
Light rays are brought to a real focal point exactly 400mm behind the center of the lens. Commonly prescribed for reading, hyperopia, or presbyopia.
Explore Additional Utilities
Drift calculation — wind speed ↔ canopy speed → landing offset
Calculate descent drift offset distance, wind deflection angles, and flight heading corrections for precision landing dropzones.
Saponification value — oil type ↔ lye required per gram
Look up sap values for standard oils and calculate custom lye weights.
Wind Chill Calculator
Determine the feels-like wind chill index from ambient air temperature and wind speed.
Infill density (% ↔ structural strength)
Estimate mechanical tensile strength and relative part weight based on infill percentage, material choice, and shell count.
Tolerance converter (ISO fit classes ↔ clearance)
Find upper and lower deviation limits for shaft and hole ISO 286 fit classes like H7, g6, f7, and compute clearances in microns or mm.
Cosmic Distance Converter
Convert huge distances across Light Years, Parsecs, Astronomical Units, and Kilometers.
Safety glass thickness ↔ impact resistance rating
Calculate safety glass thickness requirements and impact resistance (Tempered vs. Laminated).
Brick Count Estimator
Calculate bricks, mortar volume, sand, and cement needed for masonry walls.
Body Surface Area (BSA) Calculator
Calculate body surface area (BSA) for clinical dosing using Mosteller, DuBois, Haycock, and Gehan-George formulas.
Color rod weight ↔ color intensity in clear glass
Calculate required color rod weights to achieve target color intensity saturation levels in clear glass gathers.
Quench rate — steel grade ↔ medium — oil vs water vs air
Identify ideal quench mediums and tempering guidelines for hardening various carbon and alloy steel grades.
Heel angle ↔ righting moment
Calculate heel angle, righting arm (GZ), righting moment, and sailboat stability from displacement, vertical center of gravity, and wind force.
Layer height ↔ print time estimator
Estimate 3D print duration changes and total layer counts when switching layer heights and print speeds.
Twist per inch (TPI) — spinning wheel flyer ratio ↔ speed
Calculate twists per inch (TPI) based on flyer ratio, treadles per minute, and fiber intake rate.
Coverage rate — chemical amount ↔ area treated
Determine total chemical volume or weight required based on the target area, sprayer output flow, and speed.
Cycling FTP & Power Zone Calculator
Calculate personalized cycling power training zones (Coggan 7-zone model) based on your Functional Threshold Power (FTP) in watts.
Dye concentration — leather area ↔ product needed
Estimate leather dye volume needed based on total surface area, coat layers, and color reduction ratios.
Servo angle ↔ PWM pulse width
Convert between servo rotation angle in degrees and standard PWM pulse width in microseconds, with continuous rotation presets.
Queen cell age — egg laying date ↔ emergence date
Calculate the full developmental timeline of queen honeybees from egg laying to capped cells and emergence date.
Signature count — total pages ↔ sheets per signature
Divide book blocks into balanced signatures and calculate standard folded sheet configurations.