Scale Explorer

Everyday objects

How big is a grain of rice?

Grain of rice · Long-grain rice kernel (brown rice, after hulling) · Oryza sativa

Kernel length (long-grain class)
6.6–7.5 mm 0.26–0.295 in range
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Grain of sand, Ant (black garden ant), Grain of rice, Human drawn to the same scaleGrain of sand: grain diameter (sand size class) 0.0625–2 mm (too small to see at this scale). Ant (black garden ant): length (worker) 3.4–5 mm (too small to see at this scale). Grain of rice: kernel length (long-grain class) 6.6–7.5 mm (too small to see at this scale). Human: height 1.61–1.75 m.Grain of sand: 0.0625–2 mm (too small to see at this scale)Ant (black garden ant): 3.4–5 mm (too small to see at this scale)Grain of rice: 6.6–7.5 mm (too small to see at this scale)Human: 1.61–1.75 mHuman1.61–1.75 mGrain of sand0.0625–2 mm · too small to seeAnt (black garden ant)3.4–5 mm · too small to seeGrain of rice6.6–7.5 mm · too small to see

Grain of sand, Ant (black garden ant) and Grain of rice are too small to see at this scale and are marked with ▲.

Everything is drawn to the same scale, standing on the same ground line. Silhouettes are simplified outlines scaled to the measured dimension. A faded outline shows the top of a size range.

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Dimensions

MeasurementMetricImperialNotesSource
Kernel length (long-grain class) 6.6–7.5 mm 0.26–0.295 in IRRI 'Long' class for brown rice length, measured after dehulling and before milling. Range: varies [1]

About the grain of rice

Rice kernels are sorted into length classes, and long-grain varieties have long, slender kernels. The International Rice Research Institute's Standard Evaluation System classes a hulled brown-rice kernel as long when it measures 6.6 to 7.5 millimetres. Kernels over 7.5 mm count as extra long, while medium grains run 5.51 to 6.6 mm.

  • IRRI's length classes for brown rice are extra long (more than 7.5 mm), long (6.6 to 7.5 mm), medium (5.51 to 6.6 mm) and short (5.5 mm or less). [1]
  • Kernels are called slender when their length is more than 3 times their width. [1]

How many fit?

  • ≈ 220–270 × Grain of rice · kernel length (long-grain class) lined up end to end match the Human · height
  • ≈ 3.3–120 × Grain of sand · grain diameter (sand size class) lined up end to end match the Grain of rice · kernel length (long-grain class)

Counts divide one sourced figure by another. "End to end" uses each object's main measurement; weight and volume rows appear only when both figures are sourced.

How it compares

  • 3.3–120× A grain of rice is about 3.3–120 times as long as a grain of sand is wide. See side by side
  • 1.3–2.2× A grain of rice is about 1.3–2.2 times as long as a black garden ant. See side by side
  • 1/1.3–2.3 A honeybee is about 1.3–2.3 times as long as a grain of rice. See side by side
  • 1/2.7 A US penny is about 2.7 times as wide as a grain of rice is long. See side by side
  • 1/6.1 A golf ball is about 6.1 times as wide as a grain of rice is long. See side by side
  • 1/220–270 An average adult is about 220–270 times as tall as a grain of rice is long. See side by side

Factors compare the kernel length (long-grain class) of a grain of rice with each object’s own main measurement (height for a human). Where a size varies, the factor is given as a range.

Notes on these figures

  • The range is IRRI's long-grain class for brown rice (hulled, before milling); milled white rice was not measured by this source.
  • No USDA figure for kernel length was found, so the IRRI scale is used instead.
  • No primary source giving the mass of a single long-grain kernel was found, so mass is left out.

Sources

  1. International Rice Research Institute (IRRI) Rice Knowledge Bank, Standard Evaluation System for Rice (SES). Accessed 25 September 2026.

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