Genesis 6:15 · Bible study
Genesis 6:15 Commentary: Study: The Ark's Dimensions and Sufficiency
Hebrew · 7 what the commentators say
Meaning in one sentence
Examine the size and capacity of Noah's ark from Genesis 6:15. How large was it? Could it hold all the animals? Scholarly analysis with pastoral reflections.
Research Summary
- Meaning: God provides precise dimensions for the ark to ensure it is large enough to carry Noah’s family and all the animals through the Flood.
- Key words: Cubit (H0520, אַמָּה), a unit of measure from elbow to fingertip, roughly 18, 22 inches. Ark (H8392, תֵּבָה), a chest or box, not a ship.
- Main debate: The exact length of the cubit (18 vs. 22 inches) and whether the ark could hold all animal kinds, but most scholars affirm it was sufficient.
- Theological theme: God’s ordered provision for salvation; obedience to detailed commands; the ark as a type of Christ’s saving refuge.
- Best use: Demonstrates that God’s commands are practical and adequate; encourages trust when God’s plan seems improbable.
Translation Comparison
BSB Berean Standard Bible 2020
And this is how you are to build it: The ark is to be 300 cubits long, 50 cubits wide, and 30 cubits high.
WEB World English Bible 2000
This is how you shall make it. The length of the ship shall be three hundred cubits, its width fifty cubits, and its height thirty cubits.
KJV King James Version 1769
And this is the fashion which thou shalt make it of: The length of the ark shall be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits.
ASV American Standard Version 1901
And this is how thou shalt make it: the length of the ark three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits.
YLT Young's Literal Translation 1898
and this is that which thou dost with it: three hundred cubits is the length of the ark, fifty cubits its breadth, and thirty cubits its height;
Darby Darby Bible 1890
And thus shalt thou make it: let the length of the ark be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits.
Douay-Rheims Douay-Rheims Bible 1899
And thus shalt thou make it. The length of the ark shall be three hundred cubits: the breadth of it fifty cubits, and the height of it thirty cubits.
Translations in other languages (10 available)
Y de esta manera la harás: de trescientos|strong="H7969, H3967" codos la longitud del arca, de cincuenta codos su anchura, y de treinta codos su altura.
E desta maneira a farás: de trezentos côvados o comprimento da arca, de cinquenta côvados sua largura, e de trinta côvados sua altura.
Voici comment tu la feras: l’ arche aura trois cents coudées de longueur, cinquante coudées de largeur et trente coudées de hauteur.
Und mache ihn also: Dreihundert Ellen sei die Länge, fünfzig Ellen die Weite und dreißig Ellen die Höhe.
En aldus is het, dat gij haar maken zult: driehonderd ellen zij de lengte der ark, vijftig ellen haar breedte, en dertig ellen haar hoogte.
Ed ecco come la dovrai fare: la lunghezza dell’arca sarà di trecento cubiti; la larghezza, di cinquanta cubiti, e l’altezza, di trenta cubiti.
A uczynisz go na ten kształt: Trzy sta łokci będzie długość korabia; pięćdziesiąt łokci szerokość jego, a trzydzieści łokci wysokość jego.
И сделай его так: длина ковчега триста локтей; ширина его пятьдесят локтей, а высота его тридцать локтей.
方舟的 造法 乃是 這樣：要長 三 百 肘，寬 五十 肘，高 三十 肘。
And this is the way you are to make it: it is to be three hundred cubits long, fifty cubits wide, and thirty cubits high.
Verse in Context
Original Language (Biblical Hebrew)
Old Testament · Biblical Hebrew · Genesis 6:15
Source: STEPBible TAGNT/TEHB (CC-BY 4.0). Click or tap a morphology code to see the full parsing.
Scholars' Consensus
Commentators across traditions agree that the ark’s dimensions in Genesis 6:15 are given as precise, divinely specified measurements, and that the vessel was more than large enough for its purpose. Adam Clarke calculates that using an 18-inch cubit the ark was 450 feet long, 75 feet wide, and 45 feet high, and he notes that Dr. Arbuthnot computed it as 81,062 tons burden. Gill’s Exposition and the Cambridge Bible also cite approximate lengths of 450 to 547 feet depending on the cubit used, with a breadth exactly one-sixth and height one-tenth of the length, proportions that confer stability. Jamieson-Fausset-Brown observes that the ark was not a ship designed to sail but an immense house meant only to float, and they see the dimensions as sufficient for its cargo. The consensus is that God gave a design that was both workable and generous, removing any difficulty about capacity.
How settled is the interpretation?
Interpretive difficulty: Low
What is clear: God gave specific dimensions that produced an ark of enormous size, fully adequate for the purpose of preserving life through the Flood.
What Scholars Agree and Debate
| Topic | Agreed | Debated |
|---|---|---|
| Cubit length | Christians agree the ark was very large, far beyond any ancient ship. | Some hold a cubit of 18 inches (common length) yielding a 450 ft ship; others argue for a longer royal or Egyptian cubit of about 22 inches, making it over 540 ft. Both views affirm the ark’s adequacy. |
| Ark's design as ship or box | The ark was not a sailing vessel but a floating structure designed to survive the Flood. | Comments like Jamieson-Fausset-Brown and Ellicott emphasise it was an oblong box. Some traditions still call it a ship. The Hebrew tevah means box, which supports the box interpretation. |
| Number and kinds of animals | The ark held representatives of all air-breathing land animals, plus seven pairs of clean animals. | There is discussion about how many species existed and whether the dimensions allow enough room. Most commentators (e.g., Clarke, Gill) demonstrate the capacity was more than sufficient even with generous space. |
Historical & Cultural Context
The cubit in the ancient Near East was not a fixed unit. Clarke mentions that Greaves found it to be 21.888 inches by measuring Egyptian pyramids, which would make the ark 547 feet long. Others assume a common cubit of about 18 inches, giving a length of 450 feet. Either way, the ark was enormous by any ancient standard. The Hebrew word for ark, tevah, is an archaic term for a box or chest, not a ship with sails and rudder. Ellicott notes that it was an oblong box intended to float, not to navigate. The flat bottom and simple roof (see verse 16) made it stable but unseaworthy by modern standards, which is consistent with a vessel that needed only to survive the Flood, not to steer.
The dimensions themselves are meaningful. A length-to-width ratio of 6:1 is still used in modern shipbuilding for stability. The height being one-tenth of length gave it a low centre of gravity. These proportions were not standard in Babylon or Assyria, where the flood story gives a different shape: height and breadth the same (120 cubits). The biblical account thus reflects a design that maximises cargo capacity and stability, not an arbitrary tradition. God’s command to Noah came with precise numbers, showing that salvation would involve ordered, tangible obedience, not just spiritual sentiment.
Textual Notes
The supplied commentaries note no significant textual variants for Genesis 6:15. The Masoretic Text is consistent across manuscripts, and the verse presents no known textual debates. The numbers (300, 50, 30) are stable in the Hebrew tradition and ancient translations. The main variation concerns the unit ‘cubit’, not the text itself.
Reception History
From the early church onward, the ark’s dimensions have been understood as divinely ordered and typologically significant. Irenaeus and Augustine saw the ark as a type of the church, the wood of salvation. In the Middle Ages, allegorical interpretations highlighted the three stories as representing three eras of history or the Trinity. Protestant reformers like Luther and Calvin stressed the literal obedience of Noah and the sufficiency of God’s commands. The dimensions have also been the subject of mathematical and engineering studies, with many noting that the proportions are close to those of modern cargo ships. Across Catholic, Orthodox, and Protestant traditions, the ark remains a symbol of God’s faithful provision through judgment.
Preaching This Verse
Three-point outline
- God gives specific instructions for salvation. The length, width, and height are not vague; they show that God’s plan is concrete and sufficient. Noah had to follow the blueprint exactly.
- The ark’s size reveals God’s generosity. It was far larger than necessary for eight people, allowing room for animals and provisions. God does not give minimal grace but abundant provision.
- Obedience to a seemingly impossible command is possible when God supplies the design. Noah built for decades, trusting the proportions. We too are called to trust God’s plans even when they seem overwhelming.
Five-point outline
- The ark’s dimensions are a product of divine wisdom, not human guesswork.
- The proportions (1:6 width to length, 1:10 height to length) produce stability.
- The size ensures that the ark can carry the entire cargo of living creatures and food.
- God’s command comes with a promise: the ark will preserve life through judgment.
- Noah’s faithful building models a life of trusting God’s revealed word.
Illustration hooks
- The house blueprint, Imagine receiving a detailed architectural plan for a house. Following it exactly produces a safe home. Noah had God’s own plan.
- The shipping container, Modern container ships are massive, but the ark compares in length to the early 20th-century ships. It was a marvel of ancient engineering, full to capacity with life.
- The family road trip, Packing a car for a long journey requires precise planning. God gave Noah a vehicle with perfect specs.
Questions your congregation is asking
- Was the ark really big enough for all the animals?
- Why does God give such specific measurements instead of just saying ‘build a big boat’?
- How long did it take Noah to build something that large?
Leading a Discussion
This small group guide explores the precision of God’s instructions and the trust required to follow them. The ark’s dimensions remind us that God is a God of order and provision, not chaos.
Discussion questions
- What stands out to you about the specific numbers in this verse? Why might God include them?
- How do you imagine Noah felt when he heard these dimensions? What might have been his biggest challenge?
- The ark was designed to float, not to sail. What does that tell us about God’s plan for survival versus control?
- Other ancient flood accounts give different dimensions. Why do you think the biblical record emphasises exact numbers?
- How does knowing the ark’s size (450, 550 feet long) affect your view of the story’s historical plausibility?
- In what ways does God give you ‘dimensions’ or specific instructions for your life today? How do you respond?
- What does this verse teach us about God’s character, especially about His care for creation and His method of salvation?
Word Study
The key original-language words in this verse. Select any word for its full lexicon entry — meaning, every occurrence in Scripture, and related words.
Cross-References
Source: Treasury of Scripture Knowledge (TSK, public domain)
| Genesis 7:20 | The waters rose fifteen cubits higher, and the mountains were covered. |
| Deuteronomy 3:11 | (For only Og king of Bashan remained of the remnant of the Rephaim. Behold, his bedstead was a bedstead of iron. Isn’t it in Rabbah of the children of Ammon? Nine cubits was its length, and four cubits its width, after the cubit of a man.) |
Interlinear and lexical data from STEPBible (CC BY 4.0). Cross-reference data from OpenBible.info (CC BY 4.0). Commentaries are public domain.
For personal reflection
Read the devotional page — prayer, application, and "for families"
What the Commentators Say
7 public-domain commentaries, condensed into plain language.
Adam Clarke's Commentary Methodist/Wesleyan 1826
Clarke defends the ark's size against skeptics by challenging the common 18-inch cubit. Citing measurements from the Egyptian pyramids, he argues the ancient cubit was nearly 22 inches, making the ark 547 feet long. This capacity, he calculates, was more than enough for all animals and a year's provisions.
Cambridge Bible for Schools and Colleges Anglican 1880
The Cambridge commentary draws attention to the exact proportions of the ark: its breadth is precisely one-sixth and its height one-tenth of its length, a careful mathematical design absent in the much larger Assyrian and Babylonian flood accounts. This suggests the biblical measurements are not arbitrary but deliberately ordered.
Geneva Bible Notes Reformed 1599
The Geneva Notes draw attention to the precise measurements God commanded for the ark: 300 cubits long, 50 wide, and 30 high. These dimensions reveal an enormous vessel, demonstrating that God provided ample space for every creature He intended to save. The specific numbers show the ark was carefully designed for its purpose.
Gill's Exposition of the Bible Baptist 1748
Gill notes that the ark's dimensions are given in cubits, but the exact length of a cubit was debated. While many scholars assume an eighteen-inch cubit, he points to Dr. Cumberland's argument that the biblical cubit was closer to twenty-one inches, making the ark nearly twice as large and far more adequate for its purpose.
Jamieson-Fausset-Brown Commentary Protestant 1871
JFB corrects the common image of the ark as a ship, describing it instead as an immense house built only to float. Based on a cubit of 21.888 inches, they calculate its dimensions at 547 feet long, 91 feet wide, and 47 feet high.
Lange's Commentary Reformed 1857
Lange highlights the ark’s specific dimensions and construction details as evidence of precise divine instruction rather than vague symbolism. He notes that the window extends downward from the top, allowing light into the multiple stories while maintaining structural integrity. This careful design underscores God’s provision for both survival and order during the coming judgment.
Matthew Henry's Commentary Reformed/Presbyterian 1710
Henry highlights that God's favor toward Noah shows first in how the Holy Spirit repeats his name five times in five lines, taking delight in his memory. The greater grace appears in the detailed instructions and covenant promises God personally gives him, making Noah a partner in the plan of salvation.