Entry calculators

Move the assumption, watch the answer move

The book prints one working value and shows the alternatives in a table. Every four-page entry's assumption table is the input panel; its sensitivity table is the live output.

16 interactive calculators are available. Their defaults correspond to the book's working values.

4 ppStipulated

A Corridor on Dry Ground

9,005,240 ft³ (255,000 m³) displaced, a 24.9 mi (40 km) column, and an entry window two independent methods agree on.

Exodus 14:21–29

4 ppStipulated

The Camp in the Wilderness

Water, ration mass, tent grid, camp area, and a drawn distribution model.

Numbers 2; Exodus 16–17

4 ppStipulated

Gideon's Three Hundred

Three hundred trumpets and three hundred jars around a camp of 135,000, as an acoustics problem.

Judges 7:1–22; 8:10

4 ppStipulated

Fifteen Cubits Above the Mountains

Terrain-aware global integration separates about 1.056 billion cubic miles of additional water from 1.376 billion cubic miles total at peak.

Genesis 7:11–24

4 pp

A City Under Siege

Dates stated to the day. Convert them, and the ration curve follows.

2 Kings 25:1–10

4 pp

Solomon's Temple and Palace

A workforce of 163,300, a million person-years, and two accounts that disagree on the supervisors.

1 Kings 5:13–7:51

4 pp

Ezekiel's Measured Temple

A closure test. Nine stated components against one stated total — and it comes out exactly.

Ezekiel 40–42

4 pp

The Tabernacle, Measured and Portable

Metal given to the shekel, and a census figure that matches it exactly. Then the carts.

Exodus 26; 38:24–31

4 pp

Counting the People

Two lists that each add up to their stated total, and one later count given twice.

Numbers 1; 26; 2 Samuel 24

4 pp

Dividing the Land by Lot

Allotment in proportion to the census, and how much ground that leaves a household.

Joshua 14–19

4 pp

Storing Grain for Seven Years

Fourteen years of stock, accumulating then drawn down. The only time series in the book.

Genesis 41:33–57

4 pp

Blue, Purple, and Scarlet

How many sea snails the Tabernacle curtains take. The answer is in the millions.

Exodus 25:4; 28:5–8

4 pp

Hezekiah's Tunnel

One unresolved assumption swings the headline tonnage by two thirds.

2 Kings 20:20

4 pp

The Bronze Sea

First Kings controls the dimensions and 2,000-bath model; the 3,000-bath Chronicles figure remains a labeled comparison.

1 Kings 7:23–26

4 pp

Goliath's Armor and the Sling

A stature in cubits and a span, armor in shekels, and energy that goes as the square of one assumption.

1 Samuel 17:4–7

4 pp

Seven Days, Then Look Again

What rate of change can a seven-day observation interval actually detect?

Leviticus 13–14

How these work

Defaults are the book's printed working values. One button restores them, so the site can never quietly disagree with the page.
Every formula is printed beside its result, so any figure can be reproduced by hand.
Every run can be shared as a link and exported as a table.
Assumptions are labeled as assumptions. Where a value is supplied by the author rather than stated by the passage, the input group says so.

On entries marked stipulated, the tool describes the event as the passage gives it. The cause is outside the scope of this book.

The two four-page entries with no calculator

Two Ways of Sorting Animals (Leviticus 11) and Leviathan (Job 41) earned four pages on stated values — one is a complete taxonomy, the other a long physical description. Neither has assumed parameters with a sensitivity, which is what a calculator is. There is nothing to move.

Building one anyway would mean inventing parameters to make the widget work, which is the assumption-padding failure the extent rule exists to prevent. They appear in the book as comparison tables and on this site in the entry index.