Water Discount RatioSaponification Lab
Calculate full water vs discounted water ratios. Speed up curing, avoid glycerine rivers, and calculate custom lye concentration percentages.
Heat lye solution to transparent clarity.
Proportion of active lye in the solution.
Diagnostic rating: Standard Water Ratio
Excellent for beginners. Safe handling window, slow soap batter tracing, easy to pour swirled colors.
Explore Additional Utilities
Drawing out ratio — starting thickness ↔ final length
Estimate expanded length when forging down the cross-section thickness of hot steel bars under conservation of volume.
Speed to fly — polar curve ↔ McCready interthermal speed
Calculate the optimum speed to fly between thermals based on the glider polar curve, expected next thermal climb rate, and headwind/sink.
Calorie burn — elevation gain + weight → energy needed
Estimate metabolic calorie consumption based on hiker weight, pack weight, trip duration, and elevation profile.
Sight mark ↔ distance — graduated sight tape
Generate calibrated sight marks and construct sight tape lines for varying shooting distances based on core velocity.
Half Value Layer (Shielding)
Calculate radiation intensity reduction through shielding materials (lead, steel, concrete, water) using half-value thickness and attenuation.
Stepper motor steps (degrees ↔ steps ↔ microsteps)
Convert between motor rotation angles in degrees, physical steps, and microsteps based on step angle and microstepping resolution.
Elastic Stretch Ratio Calculator
Calculate the stretch percentage and relaxed vs. stretched lengths of elastics or stretch fabrics.
Bit size — horse mouth width ↔ mm/inch measurement
Convert horse mouth width measurement to proper bit sizing in inches, centimeters, and millimeters with clearance safety margins.
Gear inches — chainring ↔ cog ↔ wheel size
Calculate bicycle gear inches, development (meters of development), and gear ratio options.
Nocking point height — arrow flight correction
Calculate the recommended nocking point elevation based on arrow rest clearance, shaft diameter, and tiller measurements to correct arrow flight.
Heel angle ↔ righting moment
Calculate heel angle, righting arm (GZ), righting moment, and sailboat stability from displacement, vertical center of gravity, and wind force.
Drug Concentration Converter
Convert pharmaceutical concentrations between % w/v, mg/mL, and mol/L using substance molecular weight presets.
Container volume ↔ wax fill weight — density calculation
Convert liquid container water volumes to actual solid wax weights using correct wax specific gravity ratios.
Honey yield — hive strength ↔ kg per season estimate
Estimate seasonal honey surplus production based on hive workforce size and local floral nectar flow conditions.
Arrow spine ↔ draw weight + length — stiffness matching
Estimate required arrow static spine rating (stiffness) based on bow draw weight, arrow length, and bow type.
Animal Feed & Dry Matter Calculator
Convert animal body weight percentage dry matter intake (DMI) to daily feed requirements in kg/lbs, based on feed dry matter ratio and species presets.
Grade converter — Yosemite ↔ French ↔ UIAA ↔ Australian
Convert climbing difficulty grades across Yosemite Decimal System (YDS), French, UIAA, Ewbank, and bouldering scales.
Rolling resistance — tire pressure ↔ road surface → watts lost
Calculate power loss (watts) due to tire rolling resistance coefficient (Crr), system weight, and velocity.
Body Surface Area (BSA) Calculator
Calculate body surface area (BSA) for clinical dosing using Mosteller, DuBois, Haycock, and Gehan-George formulas.
Freefall time — altitude ↔ seconds in freefall
Estimate freefall duration and terminal velocity based on exit altitude, deployment altitude, and body position.