US quarter
A US quarter is a coin worth twenty-five cents, commonly used in United States currency.
Also known as: quarter, quarter dollar
How big is it?
2.426 cm across
Also 0.955 in
Diameter · specified
Format: Standard clad. US quarter: 24.26 mm (0.955 in) in diameter, 1.75 mm (0.069 in) thick, and 5.67 g in mass. Diameter measures across the face, not the edge thickness.
Check US quarter material and older-format differences. Compare UK and US coin dimensions.
A little perspective
US quarter vs UK 10p coin: diameter comparison
The diameter of a UK 10p coin is about 1.01 times the diameter of a US quarter.
A US quarter is a coin worth twenty-five cents, commonly used in United States currency.
A UK 10p coin is the ten-pence denomination of the decimal pound sterling circulation coinage.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
US quarter
Diameter: 2.426 cm; specified.
Standard copper-nickel clad US quarter: 24.26 mm diameter, 1.75 mm thickness and 5.67 g mass. Earlier silver quarters do not share this mass. The illustrated relief is representative; the circular rim is the measured span.
US Mint — circulating coin specifications
The marked diameter is calibrated. Unmeasured illustration details are representative.
UK 10p coin
Specified diameter: 2.45 cm; specified.
Smaller UK 10p format introduced in September 1992: 24.5 mm diameter and 6.5 g mass. The 1.85 mm thickness is used here as a cupro-nickel reference, not a verified nickel-plated steel specification. The Mint lists 1.85 mm without separating materials; secondary references report 2.05 mm for steel, so steel thickness remains unresolved here. The material change in 2012 was separate from the 1992 size reduction; cupro-nickel coins remained legal tender during the replacement programme.
Royal Mint — 10p specifications and format history
The marked specified diameter is calibrated. Unmeasured illustration details are representative.
Use the visual comparison to explore its scale, then check the measurements and sources.
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Why this measurement?
Why we use 2.426 cm
We compare the diameter of a US quarter. This value follows a stated specification; check its scope in the notes.
Standard copper-nickel clad US quarter: 24.26 mm diameter, 1.75 mm thickness and 5.67 g mass. Earlier silver quarters do not share this mass. The illustrated relief is representative; the circular rim is the measured span.
The marked horizontal span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 24.26 mm (0.955 in) | Not recorded | specified - Standard clad | |
| 5.67 g | Not recorded | specified - Standard clad | |
| 1.75 mm (0.069 in) | Not recorded | specified - Standard clad |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valueEveryday objects£1 coin2.343 cmSpecified maximum diameterA £1 coin is a twelve-sided British coin used as standard currency in the United Kingdom.
Around the same scaleEveryday objectsUS nickel2.121 cmDiameterA US nickel is a five-cent coin made primarily of a copper-nickel alloy.
Nearest higher valueEveryday objectsUK 10p coin2.45 cmSpecified diameterA UK 10p coin is the ten-pence denomination of the decimal pound sterling circulation coinage.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- US Mint — circulating coin specificationsNominal format specifications. Direct retrieval returned HTTP 403 during the October 2026 review; additional references identify the thickness values used.
- CoinNews — US circulating coin specificationsSecondary corroboration of nickel, dime and quarter thicknesses and format masses. Its older penny thickness differs; that value is not used.
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