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Weight Unit Converter for Cross-Border Shipments

Shipping a parcel from Shenzhen to Berlin and the carrier wants kilograms, but your supplier quoted everything in pounds? Happens all the time. This unit converter takes the headache out of swapping between g, kg, lb, oz and metric tons so you can fill in customs forms, freight quotes and marketplace listings without second-guessing the math. Whether you're a small Etsy seller posting your first international order, a dropshipper double-checking a 3PL invoice, or a procurement lead reconciling a bulk shipment, you need numbers that match what the courier prints on the label. Toolsany's weight converter handles the awkward conversions instantly — like 2.5 lb into grams for a USPS

How to use Weight Unit Converter for Cross-Border Shipments

  1. Pick your starting unit. Choose the unit your supplier, scale or invoice uses — grams, kilograms, pounds, ounces or metric tons.
  2. Type the weight. Enter the number exactly as it appears on your packing slip or kitchen scale. Decimals are fine.
  3. Choose the target unit. Pick the unit your carrier or customs form expects, like kg for international air freight or lb for US domestic.
  4. Read the converted result. The answer appears instantly below the form, rounded to a sensible precision for shipping paperwork.
  5. Copy it onto your label. Paste the value straight into your courier portal, customs declaration or marketplace listing.

Frequently asked

Which weight unit do most international couriers use? DHL, FedEx, UPS and most postal services default to kilograms on the air waybill, even for shipments originating in the US. Pounds usually only appear on domestic US labels.
How do I convert pounds to kilograms for a customs declaration? Multiply pounds by 0.4536, or just drop the value into the converter above. For customs, two decimal places is almost always enough precision.
What's the difference between a metric ton and a US ton? A metric ton is 1,000 kg (about 2,204.6 lb). A US short ton is 2,000 lb (about 907.2 kg). Always confirm which one your freight forwarder is quoting.
Should I use actual weight or volumetric weight for shipping? Carriers charge whichever is greater. This tool handles actual weight — for volumetric, multiply length × width × height in cm and divide by the carrier's dim factor (usually 5000 or 6000).
How accurate are the conversions? We use the official SI definitions, so results are accurate to many decimal places. We round the display for readability, but the underlying math matches what customs systems use.
Can I convert ounces to grams for small jewelry or cosmetics shipments? Yes — 1 oz equals roughly 28.35 g. The converter handles fractional ounces too, which is handy for samples and lightweight goods that ship by ePacket.
Is the tool free for commercial use? Completely free, no account needed. Use it for as many shipments, quotes or invoices as you like.
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