// Stop postfixing your variables and method names with the unit...
double weightKg = GetPersonWeightInKg();
UpdatePersonWeightInGrams(weightKg * 1000);

// ...and start using a static representation for the measurement then 
// explicitly convert to the unit of choice - when you need it.
Mass weight = GetPersonWeight();
UpdatePersonWeightInGrams(weight.Grams);

// Convert between compatible units of measurement...
Force scaleMeasurement = Force.FromNewtons(850);
Mass personWeight = Mass.FromGravitationalForce(scaleMeasurement);
double weightKg = personWeight.Kilograms;

// ...while avoiding confusing conversions, such as between weight and mass.
Mass weight = GetPersonWeight();
double weightNewtons = weight.Newtons; // No such thing.

// Some popular conversions.
Length meter = Length.FromMeters(1);
double cm = meter.Centimeters; // 100
double yards = meter.Yards; // 1.09361
double feet = meter.Feet; // 3.28084
double inches = meter.Inches; // 39.3701

Pressure p = Pressure.FromPascal(1);
double kpa = p.KiloPascals; // 1×10-3
double bar = p.Bars; // 1×10-5
double atm = p.Atmosphere; // 9.86923267×10-6
double psi = p.Psi; // 1.45037738×10-4

// Explicitly
double m = UnitConverter.Convert(1, Unit.Kilometer, Unit.Meter); // 1000
double mi = UnitConverter.Convert(1, Unit.Kilometer, Unit.Mile); // 0.621371
double yds = UnitConverter.Convert(1, Unit.Meter, Unit.Yard); // 1.09361

// Or dynamically.
UnitValue val = GetUnknownValueAndUnit();

// Returns false if conversion was not possible.
double cm;
val.TryConvert(Unit.Centimeter, out cm);

var f = Force.FromPressureByArea(Pressure p, Length2d area);
var f = Force.FromMassAcceleration(Mass mass, double metersPerSecondSquared);

  var us = new CultureInfo("en-US");
  var norwegian = new CultureInfo("nb-NO");
  
  Unit.Tablespoon == UnitSystem.Create(us).Parse("tbsp")
  Unit.Tablespoon == UnitSystem.Create(norwegian).Parse("ss")  

  "T" == UnitSystem.GetDefaultAbbreviation(Unit.Tablespoon, us)
  "ss" == UnitSystem.GetDefaultAbbreviation(Unit.Tablespoon, norwegian)