The word 'pennyweight' has two distinct meanings in common use. One is a unit of mass used in precious-metal commerce; the other is simply the physical weight of the US one-cent coin. They share only the name -- their values and uses are unrelated.
2.500 g (post-1982 zinc) / 3.110 g (1864-1982 bronze)
1.55517384 g (1/20 troy ounce, 24 grains)
US penny weight is 2.500 g for the modern zinc cent (1982-2025) and 3.110 g for the older bronze cent (1864-1982). If you searched 'pennyweight' looking for the dwt unit of mass used in jewelry and precious-metal trade, that is a separate unit -- 1.55517384 g -- covered below.
A modern US penny (zinc cent, 1982-2025) weighs 2.500 g with a ±0.100 g Mint tolerance; the older bronze penny (1864-1982) weighs 3.110 g.
The zinc cent introduced mid-1982 weighs 2.500 g and is composed of 97.5% zinc with a thin copper electroplate. The bronze cent struck from 1864 through early 1982 weighs 3.110 g at 95% copper. The 1943 steel cent -- the only magnetic US cent -- weighs 2.700 g. A coin at 2.4-2.6 g matches the zinc-cent specification; one at 3.0-3.2 g is consistent with the bronze composition. Weight alone does not confirm authenticity for most cents, but it is the fastest way to identify the 1982 transition-year variety and to flag suspected 1943 bronze counterfeits.
Three distinct weight standards apply to Lincoln cents. The correct comparison depends on the year -- and for 1982, the composition must be verified by weighing, not by date alone.
| Specification | Modern Lincoln cent | Bronze Lincoln cent | Tolerance / source |
|---|---|---|---|
| Weight (grams) -- zinc cent | 2.500 g | — | ±0.100 g · US Mint specification for copper-plated zinc cent, effective mid-1982 through 2025; 31 USC § 5112(b). |
| Weight (grams) -- bronze cent | 3.110 g | — | ±0.097 g (1.5 grains per Coinage Act of 1873 §16) · Applies 1864-1942, 1944-1981, and early 1982; 1944-1946 shell-case brass is same weight and composition. |
| Weight (grams) -- 1943 steel cent | 2.700 g | — | Zinc-plated steel, wartime issue; only US cent that is magnetic. |
| Diameter | 19.05 mm | — | ±0.13 mm · Uniform across all Lincoln cent compositions; unchanged since 1909. |
| Thickness | 1.52 mm | — | Consistent across zinc and bronze compositions; US Mint specification. |
| Edge | Plain (no reeds) | — | All Lincoln cents carry a plain edge; no reed count applies. |
| Composition -- zinc cent | 97.5% Zn / 2.5% Cu (copper-plated zinc core) | — | 31 USC § 5112(b); final modification by Treasury authority effective 1982. |
| Composition -- bronze cent | 95% Cu / 5% Zn | — | Standard alloy 1864-1981; trace tin in some periods; 1944-1946 shell-case brass contains no tin. |
| Composition -- 1943 steel cent | Zinc-plated steel (magnetic) | — | Wartime substitution; approximately 1.1 billion struck across Philadelphia, Denver, and San Francisco. |
Weighing a cent on a 0.01 g digital scale is the fastest way to determine its composition era and to detect fakes or altered coins. The three Lincoln cent weight standards are far enough apart (2.500 g, 2.700 g, 3.110 g) that a calibrated scale resolves them unambiguously. For the 1982 transition year -- where both compositions were struck -- weighing is the definitive test. Weight is also the first diagnostic for suspected 1943 bronze counterfeits, where the stakes are highest.
Weight alone is necessary but not sufficient. A tungsten-cored counterfeit can weigh exactly the same as a genuine coin. Always cross-check diameter, reed count, edge profile, and a ring test before concluding.
Pass: 2.400 g - 2.600 g -- within Mint tolerance for the zinc cent (1982-2025); weight is consistent with a genuine copper-plated zinc Lincoln cent.
Border: 2.200 g - 2.400 g or 2.600 g - 2.800 g -- outside Mint tolerance but may reflect a worn, off-struck, or corroded cent; verify diameter and edge profile before drawing conclusions.
Fail: Below 2.200 g or above 2.800 g (for zinc cent) -- weight does not match any standard Lincoln cent specification; likely a foreign coin, token, or damaged piece. For a coin near 3.110 g, consult the bronze cent standard; for a coin near 2.700 g, consult the 1943 steel cent standard.
Use a digital scale with 0.01 g resolution. A kitchen scale rated to 0.1 g is not precise enough to distinguish 2.500 g from 2.700 g with confidence. Jeweler's pocket scales (capacity 20-100 g, resolution 0.01 g) are widely available and cost under $20.
Before weighing, calibrate with the supplied calibration weight or a known reference coin. Set the tare with an empty weighing pan. Place the coin flat, centered on the pan. Read the stable display value -- do not record if the display is still settling.
For 1982 cents: a reading of 3.0-3.2 g confirms the bronze composition (key for the scarce 1982-D Small Date bronze variety); a reading of 2.4-2.6 g confirms zinc. The two compositions are otherwise visually identical. Weight is the only non-destructive way to distinguish them.
For suspected 1943 bronze cents: a genuine 1943 bronze cent weighs 3.110 g and is non-magnetic. A copper-plated 1943 steel fake weighs 2.700 g and sticks to a magnet. An altered-date fake (1948 or 1945 date changed to 1943) will weigh 2.500 g (zinc) or 3.110 g (bronze) but show tool marks on the '3' under a 10x loupe. Weight eliminates the copper-plated steel fake immediately -- but authentication by PCGS or NGC is essential before concluding a coin is a genuine 1943 bronze cent.
Weight is a necessary first filter, not a sufficient authentication. A cent weighing 2.500 g is consistent with a genuine zinc Lincoln cent, but it does not rule out a counterfeit struck on a correctly-weighted planchet. Diameter (19.05 mm ±0.13 mm), edge profile (plain), and surface detail under magnification should all be checked on any coin where authenticity is in question.
The table below covers every Lincoln cent weight standard from 1909 through 2026, including wartime substitutions and the 1982 dual-composition transition year.
| Years | Weight | Composition | Note |
|---|---|---|---|
| 1909-1942 | 3.110 g | 95% Cu / 5% Zn-Sn bronze | Wheat cent era; 1909-S VDB (484,000 struck) is the key date. |
| 1943 | 2.700 g | Zinc-plated steel (magnetic) | Only magnetic US cent; ~20 known 1943 bronze cents struck on leftover planchets are worth $100,000-$1,000,000+. |
| 1944-1958 | 3.110 g | 95% Cu / 5% Zn (1944-1946 shell-case brass, no tin) | 1944-1946 brass is visually identical to standard bronze; 1955 Doubled Die obverse is a major error coin. |
| 1959-1981 | 3.110 g | 95% Cu / 5% Zn bronze | Lincoln Memorial reverse replaces Wheat ears; standard bronze throughout. |
| 1982 (early -- bronze) | 3.110 g | 95% Cu / 5% Zn bronze | Eight distinct 1982 varieties exist; the 1982-D Small Date bronze is extraordinarily rare. |
| 1982 (late -- zinc) | 2.500 g | 97.5% Zn / 2.5% Cu (copper-plated zinc) | Weight is the only non-destructive way to distinguish 1982 bronze from 1982 zinc. |
| 1983-2008 | 2.500 g | 97.5% Zn / 2.5% Cu | Zinc cent, Lincoln Memorial reverse through 2008; 2009 issued four Bicentennial reverses. |
| 2009 | 2.500 g | 97.5% Zn / 2.5% Cu | Four one-year-only Bicentennial reverses: log cabin / formative years / professional life / presidency. |
| 2010-2025 | 2.500 g | 97.5% Zn / 2.5% Cu | Lincoln Shield reverse (Union Shield); circulating production ceased November 12, 2025. |
| 2026 | 2.500 g | 97.5% Zn / 2.5% Cu | Dual-date '1776 ~ 2026' commemorative; issued in annual Mint sets only -- not for general circulation. |
The most consequential change in Lincoln cent history happened mid-1982: the 95% copper bronze planchet (3.110 g) gave way to a copper-plated zinc core (2.500 g). The driving factor was a copper price spike that pushed the metal value of a bronze cent uncomfortably close to face value, creating a potential arbitrage incentive.
The weight difference -- 0.610 g, or roughly 19% -- is large enough that a 0.01 g scale separates them instantly. The diameter (19.05 mm) and thickness (1.52 mm) are identical across both compositions, so visual inspection alone cannot determine which type a 1982 cent is.
From a collector standpoint, the bronze cent carries more intrinsic copper content, though the 31 CFR § 82 melting prohibition means that copper content is informational, not actionable. The practical implication is variety identification: the 1982-D Small Date bronze cent -- which weighs 3.110 g -- is one of the most significant modern Lincoln cent rarities, with fewer than five confirmed examples known.
| Spec | Vintage | Modern | Why it matters |
|---|---|---|---|
| Weight | 3.110 g | 2.500 g | 0.610 g lighter for the zinc cent -- easily resolved by a 0.01 g scale. |
| Composition | 95% Cu / 5% Zn bronze | 97.5% Zn / 2.5% Cu (plated) | Modern cent is predominantly zinc with a thin copper electroplate, not a copper coin. |
| Copper content by weight | ~2.95 g Cu | ~0.063 g Cu (surface plate only) | The modern cent contains roughly 47x less copper by weight than its bronze predecessor. |
| Diameter | 19.05 mm | 19.05 mm | Identical -- diameter alone cannot distinguish the two compositions. |
| Edge | Plain | Plain | No reeds on any Lincoln cent; edge is not a differentiating factor. |
| Magnetic? | No | No | Neither is magnetic; only the 1943 steel cent sticks to a magnet. |
| Mint tolerance (weight) | ±0.097 g (1.5 grains, Coinage Act of 1873 §16) | ±0.100 g (US Mint specification) | Tolerances are nearly identical -- both compositions require a 0.01 g scale to resolve near-limit coins. |
Most circulating Lincoln cents are not counterfeited -- the face value is too low. The exceptions are high-stakes error coins, primarily the 1943 bronze cent and certain key-date Wheat cents where genuine examples are worth thousands to millions of dollars.
| Method | Reliability | How to | Pass | Fail |
|---|---|---|---|---|
| Magnet test | High | Hold a strong magnet near the coin. Genuine bronze and zinc cents are non-magnetic. The 1943 steel cent -- and copper-plated steel fakes of the 1943 bronze -- will stick. | No magnetic attraction for any genuine bronze or zinc Lincoln cent. | Any Lincoln cent that sticks to a magnet and is dated anything other than 1943 is immediately suspect. A 1943-dated coin that sticks is the common copper-plated steel counterfeit of the 1943 bronze error -- not the genuine article. |
| Weight on 0.01 g scale | High | Weigh the coin on a calibrated digital scale. Compare against: zinc cent = 2.500 g ±0.100 g; bronze cent = 3.110 g ±0.097 g; 1943 steel = 2.700 g. | A genuine zinc cent reads 2.4-2.6 g; a genuine bronze reads 3.0-3.2 g; a genuine 1943 steel reads approximately 2.7 g. | A coin claiming to be a 1943 bronze but weighing 2.700 g is a steel cent (plated). An altered-date coin (e.g. 1948 changed to 1943) weighs 2.500 g (zinc) -- well below 3.110 g. |
| Date inspection under 10x loupe | High | Examine the digits of the date under a 10x loupe, paying close attention to the '3' in suspected 1943 bronze cents. Altered dates (1948 or 1945 converted to 1943) leave tool marks or roughness on the upper curve of the '3'. | Clean, sharp digit contours with no tooling marks, pitting from grinding, or uneven metal flow around numerals. | Tool marks, scratches, or uneven surfaces on any digit -- especially the top of the '3' -- indicate alteration. Genuine struck digits have smooth, even relief. |
| Diameter measurement | Medium | Measure diameter with digital calipers. All Lincoln cents should measure 19.05 mm ±0.13 mm regardless of composition. | 18.9-19.2 mm -- within tolerance for a genuine Lincoln cent. | Diameter outside tolerance suggests a foreign coin, a token, or a cast counterfeit (cast pieces often shrink slightly on cooling). |
| Surface detail under magnification (cast vs struck) | Medium | Examine the coin surface at 10x-20x for granularity, porosity, or rounded letter edges typical of cast counterfeits. Struck coins have sharp, clean device edges. | Sharp letter and device edges with consistent luster (for uncirculated) or even wear patterns (for circulated). | Granular or sandy surface texture, rounded letter edges, pitting in flat fields, or seam lines on the edge indicate a cast or pressed counterfeit rather than a struck coin. |
| PCGS or NGC third-party authentication | High | Submit to PCGS (https://www.pcgs.com/coinfacts/category/lincoln-cent-modern-zinc-1982-date/789) or NGC (https://www.ngccoin.com/price-guide/united-states/lincoln-cent-zinc-pscid-23) for slab authentication before buying or selling any high-value Lincoln cent. | A coin in a PCGS or NGC holder with a matching description and verified serial number. | Any unslabbed coin claimed to be a 1943 bronze cent or a 1909-S VDB should be treated as unverified until authenticated by a major grading service. |
Lincoln cents have never contained silver. The composition history runs from bronze (95% copper, 1864-1982) to zinc core with copper plate (97.5% zinc / 2.5% copper, 1982-2025), with the 1943 exception of zinc-plated steel. Copper is the dominant metal in the bronze era; zinc dominates the modern era.
The 31 CFR § 82 melting prohibition means that the copper content of a bronze cent -- approximately 2.95 g per coin -- carries no legally actionable melt value. The rule prohibits melting or mass-exporting US one-cent and five-cent coins. Penalties are up to a $10,000 fine and/or 5 years imprisonment per violation. Any reference to the melt value of a cent is informational only.
For collectors, the more relevant 'metal content' question is whether a given cent is bronze or zinc -- because that determines which era's weight standard applies and, in the case of 1982, which variety the coin belongs to. The composition is visible in fresh, uncirculated condition (bronze has a reddish-orange color; zinc, when the copper plate wears, shows a pale grey core at wear points) but weight is the definitive test.
Copper content (grams) = Coin weight (g) x copper fraction (0.95 for bronze cent, 0.025 for zinc cent)
Note: melting US one-cent coins is prohibited under 31 CFR § 82 regardless of metal content -- any melt-value figure is informational only and does not represent a legally realizable value.
The pennyweight (symbol: dwt) is a unit of mass equal to 1.55517384 grams exactly -- or equivalently, 24 grains, or 1/20 of a troy ounce. It sits within the Troy weight system, which runs: 1 troy pound = 12 troy ounces = 240 dwt. The unit has been defined at this value continuously since 1527, when England's Tower pound was abolished and the troy system became standard for precious metals.
In the United States, the dwt remains an active commercial unit in three industries. The jewelry trade uses it to price gold, silver, and platinum repair and scrap work -- a single ring or earring may weigh 2-10 dwt, making the dwt a more convenient unit than the troy ounce for small items. The dental supply industry quotes gold alloy crowns and bridges by the dwt; a typical crown unit weighs 4-12 dwt depending on size. The scrap precious-metal industry (storefront cash-for-gold buyers and refiners) prices small quantities using the NIST Handbook 130 formula structure: spot price x purity x weight in dwt x payout percentage.
The karat purity system pairs intuitively with the dwt: 14K gold is 14 parts out of 24 pure, or 58.33% pure. One dwt of 14K gold therefore contains 0.5833 dwt of pure gold, equal to 0.02925 troy ounces. At a gold spot price of $2,000 per troy ounce, that pure-gold value is $58.50. A typical scrap dealer offer at 50-75% of spot runs $29-$44 per dwt of 14K gold. These are illustrative figures; actual offers vary.
Outside the United States, the dwt is rarely used. The International Bureau of Weights and Measures (BIPM) does not accept it in the International System of Units (SI), and it is deprecated for scientific use. The London Bullion Market Association (LBMA) and major international bullion markets price in troy ounces. The dwt persists in US trade purely by convention -- entrenched in jewelry and dental pricing structures that have not migrated to grams.
| From | To | Note |
|---|---|---|
| 1 dwt | 1.55517384 grams | exact |
| 1 dwt | 24 grains | exact |
| 1 dwt | 1/20 troy ounce | exact |
| 1 troy ounce | 20 dwt | exact |
US jewelers price gold, silver, and platinum work in pennyweights because the unit gives finer granularity than a troy ounce for small items -- a single earring or pendant typically weighs 1-5 dwt. Dental gold alloys (crowns, bridges, inlays) are quoted and dispensed by the dwt in dental supply catalogs. Scrap precious-metal buyers at storefront locations use dwt-based pricing with the NIST Handbook 130 formula as the industry standard framework. Many digital jewelry scales display both grams and dwt natively, and digital calipers for goldsmiths frequently include a dwt mode.
The word 'pennyweight' appears in Old English documents before 1398 (Oxford English Dictionary, earliest recorded use), from Old English *penig wiht* -- 'weight of a penny.' The 'd' in the symbol 'dwt' derives from Latin *denarius*, the Roman silver coin from which pre-decimal British pence took their 'd.' abbreviation in the £sd (pounds, shillings, denarii) notation used until 1971. The dwt unit predates the United States by centuries and has no metrological connection to the weight of the US one-cent coin, despite the shared name.
The modern zinc cent (1982-2025) weighs 2.500 g with a ±0.100 g Mint tolerance. The older bronze cent (1864 through early 1982) weighs 3.110 g with a ±0.097 g tolerance. The 1943 steel cent weighs 2.700 g. All three types share the same 19.05 mm diameter and plain edge, so weight is the diagnostic test that separates them.
A pennyweight (dwt) is a unit of mass equal to 1.55517384 g exactly -- also expressed as 24 grains or 1/20 of a troy ounce. It is used in the US jewelry trade, dentistry, and the scrap precious-metal industry. It is not related to the weight of a modern US one-cent coin. The dwt predates the US Mint by centuries, deriving from the historical weight of a British silver penny.
No. The pennyweight (dwt) unit is 1.55517384 g -- roughly 62% of a modern zinc cent (2.500 g) and about half the weight of a bronze cent (3.110 g). The two uses of 'pennyweight' share only the word. The dwt unit derives from medieval British coinage; the US one-cent coin has its own specification set by Congress under 31 USC § 5112(b).
1 dwt = 1.55517384 g exactly. To convert dwt to grams, multiply by 1.55517384. To convert grams to dwt, multiply by 0.6430149. For example, 5 dwt = 5 x 1.55517384 = 7.776 g.
20 dwt = 1 troy ounce exactly. The troy weight hierarchy runs: 1 troy pound = 12 troy ounces = 240 dwt. This relationship is fixed and exact -- there is no rounding in the conversion. A troy ounce of gold or silver contains exactly 20 pennyweights of that metal.
The 1982 cent was struck in both bronze (3.110 g) and copper-plated zinc (2.500 g) in the same year, producing eight distinct varieties. Weighing on a 0.01 g scale is the only non-destructive way to determine which composition a 1982 cent has. Bronze reads 3.0-3.2 g; zinc reads 2.4-2.6 g. The 1982-D Small Date bronze (3.110 g) is extraordinarily rare, with fewer than five confirmed examples.
The standard 1943 steel cent weighs 2.700 g and is magnetic -- the only US cent that sticks to a magnet. Roughly 1.1 billion were struck. The rare genuine 1943 bronze cent (fewer than 20 known, struck on leftover 1942 planchets) weighs 3.110 g and is non-magnetic. If a coin labeled '1943 bronze' sticks to a magnet, it is a copper-plated steel fake, not the genuine article.
Yes. 31 CFR § 82, promulgated by the Treasury Department in 2006, prohibits melting or mass-exporting US one-cent and five-cent coins. The prohibition on mass export covers more than $5 in cents or nickels except for travel or numismatic purposes. Penalties are up to a $10,000 fine and/or 5 years imprisonment per violation, plus forfeiture of the metal.
Circulating cent production ended November 12, 2025, when the Philadelphia Mint struck the final cent in a ceremonial event. The cent remains legal tender for all debts. 2026 cents exist only in annual Mint sets as collectibles, carrying the dual date '1776 ~ 2026' for the US semiquincentennial. Existing cents from 1909-2025 continue to spend at face value.
Each cent cost approximately 3.7 cents to produce in 2024 per the US Mint Annual Report, meaning each coin struck for circulation generated a 2.7-cent seigniorage loss. Cumulative losses exceeded $1 billion across recent years. The Federal Reserve Bank of Richmond published an analysis concluding that rounding effects on retail transactions are macroeconomically neutral, clearing the way for the cessation.
Step one: hold a magnet to it. A genuine 1943 bronze cent is non-magnetic; a copper-plated steel fake sticks. Step two: weigh it -- genuine bronze weighs 3.110 g; a steel core weighs 2.700 g. Step three: inspect the date under a 10x loupe for tool marks on the '3' (altered 1948 or 1945 dates show roughness). A coin that passes all three tests still requires PCGS or NGC authentication before any transaction.
The 1909-S VDB Lincoln Wheat cent had a mintage of 484,000 -- the lowest of any common-date Lincoln cent from that era -- before the Mint removed Victor D. Brenner's initials mid-year. Genuine circulated examples bring $700-$2,500; Mint State examples bring $5,000-$50,000 or more depending on grade. PCGS or NGC authentication is strongly recommended because counterfeits exist.
The 'd' in 'dwt' derives from the Latin word denarius -- the Roman silver coin. Pre-decimal British currency used 'd.' to abbreviate pence (from denarius) in the £sd notation of pounds, shillings, and pence. When the pennyweight unit emerged in medieval England, it inherited the 'd.' abbreviation from the coin whose weight it originally matched. The full symbol 'dwt' expands as 'denarius weight.' Some sources use 'pwt' but 'dwt' is the conventional trade symbol.
The pennyweight (dwt) remains in active use in three US-specific contexts: the retail jewelry trade (pricing repair and scrap gold or silver by the dwt), the dental supply industry (gold alloy crowns and bridges are quoted in dwt), and the scrap precious-metal industry (cash-for-gold buyers price by dwt using a formula structured on the NIST Handbook 130 approach: spot price x purity x weight in dwt x payout %). Outside the United States, grams and troy ounces are more common.
No. The pennyweight is not among the units accepted by the International System of Units (SI). The International Bureau of Weights and Measures (BIPM) has deprecated it for scientific use. The dwt belongs to the Troy weight system, which uses pounds, ounces, and pennyweights as its hierarchy. It persists in US commercial trade because of entrenched industry practice, particularly in jewelry and dentistry.
Key-date cents and high-grade examples can bring multiples of face value. A scale tells you the composition -- a value guide tells you the premium.
Check current Lincoln cent values across years →The Assay app can help identify your cent's composition era, reverse design, and mint mark from a photo -- useful when you need to confirm a 1982 variety or an unfamiliar reverse.
This page is an informational reference only; weight-based composition identification is a useful first filter but is not a sufficient authentication of any high-value coin -- third-party grading by PCGS or NGC is recommended before any significant transaction.