Unit Converter
Convert between common units of length, mass, and area.
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Weight Converter
Convert metric and imperial units of mass.
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How to use weight converter
- Enter Value using the mass unit shown on your source measurement.
- Choose From and To, checking that ounces mean mass rather than fluid volume.
- Select Convert / calculate and apply any shipping rounding rule separately.
Work through an example
Calculate a kilogram-to-pound conversion, distinguish mass ounces from fluid ounces, and avoid applying shipping rounding too early.
Convert a package mass from kilograms to pounds →Formats, privacy, and practical limits
This tool processes the values you enter in your browser. No account or upload to ERITHRA is required.
Files and generated results exist only for this tab session. Download any result you want to keep before leaving the page. Browsers may use temporary memory or disk cache while processing.
Frequently asked questions
Can ounces here be used for fluid ounces?
No. The Ounces option is a mass unit. Converting a volume to mass also requires information about the material.
Does the result include a carrier's billable-weight rules?
No. It applies fixed mass conversion factors, without dimensional-weight rules, minimum charges, or carrier rounding.