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Phase 13.0 Foundation

Universal Conversion Foundation

This page defines the shared conversion architecture before calculator rollout: unit families, converter UI, validation checks, rounding rules, explanation cards, related converter recommendations, and report templates.

Conversion HubQuality Gate

Shared unit-family framework

meter

Length

inch, foot, yard, mile, millimeter, centimeter, meter, kilometer

Best for distance, dimensions, height, width, and travel measurements.
square meter

Area

square inch, square foot, square yard, acre, hectare, square meter

Best for rooms, land, flooring, roofing, landscaping, and surface planning.
liter / cubic meter

Volume

mL, liter, gallon, quart, cup, cubic foot, cubic yard

Best for liquids, tanks, concrete-style volume, storage, and kitchen measures.
kilogram

Weight / Mass

gram, ounce, pound, kilogram, stone, ton, tonne

Best for body weight, packages, materials, shipping, and ingredient weights.
kelvin

Temperature

Celsius, Fahrenheit, Kelvin

Uses formula-based conversion rather than simple multiplication.
meter per second

Speed

mph, kph, m/s, ft/s, knot

Best for travel, running, vehicles, airflow, and simple motion estimates.
pascal

Pressure

psi, bar, kPa, MPa, atm, mmHg

Best for tires, tanks, pumps, weather, HVAC, and engineering references.
joule

Energy

joule, calorie, kilocalorie, BTU, kWh

Best for electricity, food energy, heat, and appliance planning.
watt

Power

watt, kilowatt, horsepower, BTU/h

Best for engines, appliances, HVAC, tools, and energy use rate.
second

Time

second, minute, hour, day, week, month, year

Best for schedules, durations, rates, productivity, and planning.
byte

Data Storage

bit, byte, KB, MB, GB, TB, KiB, MiB, GiB

Best for storage, downloads, backups, video files, and hosting plans.
recipe measure

Cooking

cup, tbsp, tsp, fl oz, mL, gram, ounce

Best for recipe scaling and kitchen conversions, with density notes where needed.

Converter UI framework

Preview result card

100 centimeters = 1 meter. Full live calculators start in Phase 13.1.

Every converter should explain the result, assumptions, rounding, and next step.

Precision and validation rules

Rule

Preserve the original input value and unit in every report.

Rule

Show the direct converted result plus a rounded practical result.

Rule

Use formula-aware conversion for temperature and not a simple factor.

Rule

Warn when converting between volume and weight requires density or ingredient assumptions.

Rule

Separate decimal precision from buying, cooking, or planning advice.

Rule

Flag currency conversion as rate-sensitive and requiring current-rate verification.

Conversion recommendation panel

Choose the converter family first, then confirm whether the conversion is linear, formula-based, rate-sensitive, or assumption-based. The platform should explain the result and suggest the next practical action.

  1. Select the matching unit family.
  2. Enter the source value and units.
  3. Review the converted value and rounded practical value.
  4. Check assumption notes for density, currency, cooking, or scientific precision.
  5. Open a related converter when the task needs another unit family.

Conversion report template

InputOriginal value, source unit, target unit, unit family, and user context.
FormulaConversion factor or formula used, with special handling for temperature, density, currency, or scientific notation.
ResultExact converted value, rounded practical value, precision note, and plain-English meaning.
Next StepRelated converter, verification note, or action guidance for shopping, cooking, engineering, travel, digital storage, or finance.