Money Weight Calculator
To weigh a stack of US currency: multiply the count by the per-note or per-coin weight from the official BEP / US Mint spec. Every Federal Reserve Note weighs 1.0 gram (yes, even a $100); a quarter is 5.67 g; a post-1982 penny is 2.5 g. The balance below shows your stack on the left pan and a 1 kg reference on the right. Six preset scenarios cover briefcase money, coin rolls and gold eagles.
Quick Conversion
Formula: grams = count × gpu (g per unit)
Balance scale — your stack vs 1 kg reference
Real scenarios — preloaded
$1M weight by denomination
| Denom. | Count | Weight |
|---|---|---|
| $1 | 1,000,000 | 1,000 kg |
| $2 | 500,000 | 500 kg |
| $5 | 200,000 | 200 kg |
| $10 | 100,000 | 100 kg |
| $20 | 50,000 | 50 kg |
| $50 | 20,000 | 20 kg |
| $100 | 10,000 | 10 kg |
| Penny | 100,000,000 | 250,000 kg |
| Nickel | 20,000,000 | 100,000 kg |
| Quarter | 4,000,000 | 22,680 kg |
Need to convert grams to ounces or kg? Try the Weight Converter →
Formula
weight (g) = count × unit_mass (g)weight (lb) = weight (g) × 0.00220462Worked ($1M in $100s): 1,000,000 ÷ 100 = 10,000 bills × 1.0 g/bill = 10,000 g = 10 kg = 22.05 lb. Fits in a hard-case briefcase (~14 kg total with the case).
Why every US bill weighs exactly one gram
In 2026, an armored-car logistics planner at Brink's scheduling a vault-to-bank transfer needs to know the gross weight of the cash cargo down to the kilogram so the truck's GVWR (Gross Vehicle Weight Rating, FMCSA Part 393) is not exceeded. The arithmetic relies on a single fact: every Federal Reserve Note, regardless of denomination, weighs almost exactly one gram. This calculator surfaces that fact and the companion US Mint coin specs.
The Bureau of Engraving and Printing was established by Treasury Secretary Salmon P. Chase in 1862 to produce notes for the Civil War. The 75% cotton / 25% linen paper stock has stayed remarkably constant since the National Banking Act of 1863. Modern Federal Reserve Notes (in continuous production since 1914 under the Federal Reserve Act of 1913) measure 155.956 × 66.294 × 0.10922 mm and weigh 1.0 grams ± 5% under BEP spec. The denomination is a function of ink and engraving pattern — not mass.
US coins are minted to specifications set directly by Congress under Title 31 § 5112 of the US Code. The 1965 Coinage Act removed silver from quarters and dimes, replacing it with the copper-nickel clad alloy (91.67% Cu / 8.33% Ni) still used in 2026. The quarter's 5.67 g mass and 24.26 mm diameter have been unchanged for 60 years — arcade tokens, parking meters, and laundromat slot calibrations all depend on this.
The 1982 penny composition change is the most consequential US coinage event of the late 20th century. The Mint Director's 1981 report to Congress documented that rising copper prices had pushed the metal value of a copper cent above one cent for the first time. P.L. 97-258, signed by President Reagan, authorized the switch to copper-plated zinc, dropping mass from 3.11g (95% Cu) to 2.5g and saving the Mint tens of millions of dollars annually. Despite the change, by 2026 even the zinc cent costs about 2.7¢ to produce after striking, shipping, and Mint overhead.
US Mint bullion coins follow different specs. The American Gold Eagle, authorized by the Gold Bullion Coin Act of 1985 (P.L. 99-185), contains exactly 31.1035 g (1 troy ounce) of pure gold, with copper and silver alloyed for durability bringing the gross mass to 33.93 g. The American Silver Eagle (1986, P.L. 99-61) is 31.103 g of 0.999 fine silver. These two coins are the world's most-traded bullion products, with the US Mint selling about $2.5 billion worth annually as of 2024.
The practical applications of money-weight math span industries. Cash logistics companies (Brink's, Loomis, GardaWorld) load armored-car runs by gross weight within 5%. Vending machine operators size coin tubes by coin mass per unit volume. Casino cage operations bag chips and verify cash by weight as a first-pass check. Film props departments use real currency weight to design briefcase props the actor can credibly lift. And numismatists use mass as the first authentication step — counterfeit coins often deviate from the Mint spec by 0.2 g or more.
Coinstar machines, which started in 1992 and now process about $3 billion in coin per year across 22,000 US grocery stores, charge ~12% to convert loose coin to cash. The machines internally weigh AND optically scan each coin — mass within 2% of spec plus diameter within 0.1 mm is required to accept a coin. Coin rolls remain the fee-avoidance route: most US banks accept properly-wrapped quarter rolls (40 coins, $10) at face value with no fee.
How to weigh your stack in five steps
- Choose the denomination. Each bill is 1 g; pick the coin spec from the dropdown.
- Enter the count. The scale tilts and the badges update with face value + total mass.
- Compare to 1 kg reference. The right pan holds a 1 kg block so you see relative mass.
- Apply a preset. Briefcase $1M, penny roll, quarter roll, gold eagle stack, mixed jar.
- Save the weighing. Up to 10 records persist in browser localStorage.
What cash-logistics & vault operators say
“Cash transit planning needs accurate weight. Your 1g-per-note number for FRNs matches our load tables exactly. The 22.68 kg for $1k in quarters is precisely what our coin-bag spec says. Useful for back-of-envelope route planning when the dispatch system is down.”
“We weigh bulk cash for verification — a 1,000-note strap of $100s should be 1,000g ± 5g per BEP tolerance. This calculator helped me explain to a new vault teller why a strap that comes in at 1,080g flags for manual recount. Bookmarked.”
“Finally a calculator that distinguishes pre-1982 95% copper pennies (3.11g) from post-1982 zinc (2.5g). Critical because at 2026 copper prices the pre-82 ones have a melt value of ~2.4¢ — though melting them is illegal per Treasury regulation 31 CFR 82.1.”
“When the script says "briefcase of $1 million" the actor has to actually lift it. Real $1M in $100s is 10 kg — a real briefcase. Director kept asking for $1M in $20s — that's 50 kg, not portable. This tool ended that argument on set instantly.”
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