What this calculator does
Convert precious-metal weights between grains, pennyweights, troy ounces, troy pounds, grams, and kilograms.
How it works
The calculator evaluates grams = value × grams-per-source-unit; result = grams ÷ grams-per-target-unit. Inputs are checked before calculation, and invalid values such as zero denominators or out-of-range selections produce a clear error instead of a misleading result.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
3-
?value=WeightNumber · Required · Default: 1
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?fromUnit=From unitChoice · Required · Default: ozt · Accepted values: grain, dwt, ozt, lbt, g, kg
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?toUnit=To unitChoice · Required · Default: g · Accepted values: grain, dwt, ozt, lbt, g, kg
Outputs
2-
resultConverted weightNumber · Primary output
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gramsEquivalent gramsNumber
Inputs and results
The inputs are Weight, From unit, To unit. Results include Converted weight, Equivalent grams.