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300 cubits. How big was the Ark?

Explore the length, width, and height in Genesis 6:15, with every dimension connected.

Cubit standard
length450 ft300 cubits
width75 ft50 cubits
height45 ft30 cubits

Ark vs. a football field

1.25×

the length of an American football fieldArk length: 450 ft. Full field length: 360 ft.

Noah’s Ark450 ft long × 75 ft wide
Ark footprintTop view. Length and width use the same scale as the other object in this comparison.
NFL field, including end zones360 ft long × 160 ft wide
American football field, including end zonesTop view. Length and width use the same scale as the other object in this comparison.

Top views compare the Ark’s footprint with a full American football field, including both end zones. Both objects use the same scale. Ark dimensions follow Genesis 6:15.

The 360 × 160 ft field includes both end zones; stadium seating and the surrounding border are excluded. NFL 2026 rulebook · Rule 1: The Field

View measured plan and side views
Noah’s Ark plan view: length and widthPlan view, drawn in proportion. Length: 300 cubits, approximately 450 ft. Width: 50 cubits, approximately 75 ft. The separate reference bar shows 100 feet at the same scale. This diagram illustrates dimensions, not the Ark’s precise appearance.Plan view450 ft · 300 cubits75 ftWidth · 50 cubits100 ft referenceNoah’s Ark side view: length and heightSide view, drawn in proportion. Length: 300 cubits, approximately 450 ft. Height: 30 cubits, approximately 45 ft. The separate reference bar shows 100 feet at the same scale. This diagram illustrates dimensions, not the Ark’s precise appearance.Side view450 ft · 300 cubits45 ftHeight · 30 cubits100 ft reference
Dimensions from Genesis 6:15. The 100 ft reference uses the same scale as each view. Changing the cubit changes the modern lengths; the Ark’s 30:5:3 proportions stay the same.

Using an 18-inch cubit. Historical lengths varied. About this estimate

On this page

Genesis gives three dimensions together

Genesis 6:15 gives the Ark a length of 300 cubits, a width of 50 cubits, and a height of 30 cubits. With the common 18-inch approximation, that becomes about 450 feet long, 75 feet wide, and 45 feet high.

The modern lengths change when you choose a different cubit. The biblical numbers remain the same. Keep the selected standard alongside any dimensions you use in a lesson, drawing, or discussion.

What the size comparison shows

Choose a football field or swimming pool to compare length and footprint, or a person to compare height. Each option has its own measurements and explanation. Under the default 18-inch cubit model:

  • Football field: the Ark is 450 feet long, compared with a full 360-foot American football field including both end zones: about 1.25 field lengths.
  • 50-meter pool: the Ark is 137.16 meters long, compared with a 50-meter pool: about 2.74 pool lengths. The two top views also show their different widths.
  • Person: the Ark is 13.716 meters high, compared with an illustrative 1.8-meter person: about 7.62 times that person’s height.

The interactive comparison updates with your chosen cubit estimate and display units. Length ratios describe length, rather than total area. The person’s height is a chosen reference, and the pool uses a 50 × 25 meter footprint; people and swimming pools vary.

Open the measured views to compare the Ark’s length, width, and height directly. Its 30:5:3 proportions remain unchanged under every cubit setting. The outlined form is a dimension model, rather than a precise reconstruction of the vessel’s hull or interior.

Which cubit does the explorer use?

The explorer starts with an 18-inch cubit. You can also compare 17.5-inch and 20.4-inch estimates. At those settings, the 300-cubit length becomes 437.5 feet and 510 feet respectively.

The selector demonstrates how an assumption affects the calculation. These alternatives are reference estimates; choosing one does not establish which standard the Genesis narrative intended. To enter a different number of cubits, use the general cubit converter.

Continue from the dimensions into the story

Read Genesis 6:13–22 for the instructions around the measurements. Our story and facts pages provide the wider narrative, while this explorer focuses on the dimensions.

Noah’s Ark: the Bible storyRead the story, its setting, and the surrounding passages.Facts about NoahExplore questions about Noah with biblical references.Explore other Bible measurementsCompare ancient lengths, weights, and capacities.

Common questions

What is 300 cubits in feet?

With an 18-inch cubit, 300 cubits is approximately 450 feet. A 17.5-inch estimate gives 437.5 feet, while a 20.4-inch estimate gives 510 feet.

What were the dimensions of Noah’s Ark?

Genesis 6:15 gives 300 cubits in length, 50 in width, and 30 in height. Under the 18-inch model, those dimensions convert to approximately 450 by 75 by 45 feet.

Was Noah’s Ark longer than a football field?

Under the 18-inch cubit model, the Ark is about 450 feet long. An American football field, including both end zones, is 360 feet long, so the Ark is approximately 1.25 times its length. This compares length, rather than total area: the Ark model is 75 feet wide, while the field is 160 feet wide.

Does changing the cubit change the proportions?

No. The length-to-width-to-height ratio remains 300:50:30, or 30:5:3. Selecting a different cubit changes all three modern lengths by the same proportion.

Does the diagram show the Ark’s exact design?

The diagram illustrates the dimensions stated in Genesis. Its simple shape is a teaching aid; it does not reconstruct the vessel’s precise hull, interior layout, or appearance.

Sources and calculation notes