Asset Depreciation & ACV
Calculate Actual Cash Value (ACV) vs Replacement Cost Value (RCV) using Straight-Line, reducing balance, or auto curves.
Explore Additional Utilities
Freefall time — altitude ↔ seconds in freefall
Estimate freefall duration and terminal velocity based on exit altitude, deployment altitude, and body position.
Cooling load — room size ↔ BTU ↔ tons of refrigeration
Calculate room-by-room air conditioner cooling load requirements in BTU, tons, and kilowatts based on area, insulation, and occupants.
Injector duty cycle — fuel demand ↔ injector size
Match fuel injector sizes (cc/min or lb/hr) with horsepower targets, number of cylinders, and Brake Specific Fuel Consumption (BSFC) targets.
Drain slope — mm per meter ↔ inches per foot
Convert drainage slope units and calculate vertical height drops across horizontal sewage pipes run lengths.
Braille Translator (Grade 1)
Convert standard text into visual Grade 1 Braille cell dots, and design custom cells using an interactive 6-dot braille builder.
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.
Subtitle Timing & Readability
Evaluate subtitle card readability by computing characters per second (CPS), words per minute (WPM), and duration constraints.
Cooling & HVAC Power (BTU/h ↔ W)
Compare heating, cooling, and air conditioning power capacities with corresponding watt ratings.
pH Acid/Base Index
Evaluate hydrogen ion concentrations and check acidic or alkaline levels using pH logarithmic scales.
Wood moisture content ↔ shrinkage percentage
Calculate expected wood dimensional shrinkage (radial, tangential, volumetric) based on changes in wood moisture content below fiber saturation point.
Oven Temperature & Gas Marks
Convert oven temperature heat indexes between Celsius, Fahrenheit, and official Gas Marks.
Script Character ↔ Word Counter
Analyze characters, spaces, punctuation, words, and word density. Convert text density predictions between CJK and Latin scripts.
Fuel Efficiency Converter
Convert between miles per gallon (mpg), liters per 100km (L/105km), and km/liter conversions.
IBU ↔ bitterness ratio — hop bitterness vs malt sweetness
Calculate the BU:GU bitterness ratio by comparing hop Bitterness (IBU) against malt sweetness (Gravity Units).
Mortality Rate & Life Expectancy
Explore actuarial cohort metrics, Gompertz-Makeham mortality rates, survival probabilities, and remaining life expectancy by age.
Radioactive Decay Half-Life
Estimate remaining isotope amounts and decay timelines from standard half-life periods.
Sample size calculator — confidence level ↔ margin of error
Determine required sample sizes for research surveys or experiments based on population size, confidence levels, and target margin of error.
Stage lighting — lux ↔ foot candles ↔ beam angle
Convert between Lux and Foot-candles, and compute beam diameter coverage footprint at specific throw distances.
Entropy bits ↔ password strength — character set + length
Calculate Shannon entropy bits based on character pool variety and length. Estimate brute-force resistance across various threat models.
Screw gauge ↔ mm diameter — imperial vs metric screws
Cross-reference standard wood screw gauges with thread diameter in millimeters and inches for pre-drilling and pilot holes.