You can weigh a package without a scale by building a simple balance from household items and using objects with known weights, like coins, as your reference. The method isn’t as precise as a digital scale, but for shipping purposes it can get you close enough to choose the right postage tier and avoid surprises at the post office.
Build a Balance With a Hanger
The most reliable no-scale method is a DIY balance that compares your package against objects of known weight. You need a wire clothes hanger, a sturdy place to hang it (a closet rod, doorknob, or shower curtain rod), two bags of the same size, and some string or twist ties.
Hang the clothes hanger from your support point so it can swing freely. Attach one bag to each end of the hanger’s crossbar, positioning them at equal distances from the center hook. Use clips, tape, or string to keep the bags from sliding inward. Place your package in one bag and your reference weights in the other. When the hanger sits level, the two sides weigh the same.
For heavier packages, you can use a wooden ruler or a yardstick balanced on a pencil or dowel as a fulcrum. Place the pencil under the exact center of the ruler, set your package on one end, and stack known weights on the other until it balances. This seesaw approach handles more weight than a hanger and is easier to read visually.
Use Coins as Reference Weights
U.S. coins are manufactured to precise specifications, which makes them surprisingly useful as calibration weights. According to the United States Mint:
- Nickel: 5.00 grams (0.176 oz)
- Penny: 2.50 grams (0.088 oz)
- Quarter: 5.67 grams (0.20 oz)
- Dime: 2.27 grams (0.08 oz)
Nickels are the easiest to work with because they land on a clean 5 grams each. Twenty nickels equal 100 grams, and about 91 nickels make one pound (454 grams). That sounds like a lot of coins, but if you’re weighing a package under a few pounds, rolls of coins from a bank simplify things. A standard $2 roll of nickels contains 40 coins and weighs exactly 200 grams (about 7 ounces).
For packages in the 1 to 5 pound range, you can also use common grocery items as counterweights. A standard bag of granulated sugar is 4 pounds. A can of soup typically runs about 15 ounces. A liter bottle of water weighs 2.2 pounds (1 kilogram). These aren’t as precise as coins, but they can get you into the right ballpark quickly.
Estimate Weight With Water Displacement
If your package contains a single dense object and you want a rough weight estimate without any counterweights at all, water displacement can help. This works best for small, solid items that won’t be damaged by water, not for boxed packages you plan to ship.
Fill a container with water and mark the water line. Submerge the object and mark the new water line. The difference in water level tells you the volume of the object. Since water weighs 1 gram per milliliter, you can convert displaced volume directly to the weight of water that volume would occupy. If you know what material the object is made of (steel is about 8 times denser than water, for example), you can multiply accordingly. For most shipping situations, though, the balance method is far more practical.
Don’t Forget the Box
Shipping carriers charge based on total weight, packaging included. If you’re estimating before packing, add the weight of your box to your calculation. Standard cardboard box weights by size:
- 6 x 6 x 6 inches: 120 to 150 grams (about 4 to 5 oz)
- 12 x 12 x 12 inches: 200 to 250 grams (about 7 to 9 oz)
- 18 x 18 x 18 inches: 300 to 350 grams (about 11 to 12 oz)
- 24 x 24 x 24 inches: 400 to 450 grams (about 14 to 16 oz)
Packing materials add more. A few handfuls of bubble wrap or packing peanuts typically add 1 to 3 ounces. Tape is negligible. For a medium corrugated box with typical packing material, figure roughly half a pound to three-quarters of a pound for packaging alone.
Why Accuracy Matters for Shipping
Getting close to the actual weight matters because shipping prices jump at specific thresholds. USPS, UPS, and FedEx all price by the pound for most services, rounding up to the next whole pound. That means a package weighing 2 pounds and 1 ounce costs the same as one weighing 3 pounds. UPS Ground and express services price in 1-pound increments up to 150 pounds, so every pound boundary is a potential cost jump.
For lighter items, USPS First-Class Package Service tops out at 13 ounces. Anything heavier gets bumped to Priority Mail, which costs significantly more. If your item is near that 13-ounce line, even a rough estimate from a hanger balance could save you several dollars by confirming you’re under the cutoff.
Quick Options When You Need Precision
If your DIY measurement puts you right on the edge of a weight tier, a few free or cheap options can confirm the number. Most post offices have self-service kiosks with built-in scales. UPS Store locations will weigh packages for you. Some grocery stores have produce scales in the fruit and vegetable section that read in pounds and ounces, and nobody will stop you from setting a small box on one. Office supply stores like Staples also offer shipping services with scales available.
For people who ship regularly, a basic digital postal scale costs $10 to $15 and pays for itself in a few shipments by helping you avoid overpaying on postage. But for a one-time shipment, the hanger balance with a pile of nickels will get you where you need to go.