Fathoms to Feet Converter
Accurate nautical depth calculator for fathoms to feet conversion and reverse.
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Popular Conversions Table
Conversion Formula
To change fathoms to feet, multiply fathoms by 6. Reverse: divide feet by 6.
- Feet = Fathoms × 6
- Fathoms = Feet ÷ 6
Example: 15 fathoms = 15 × 6 = 90 feet.
Visual Depth Comparison
Marine Applications
- Ship drafts marked in fathoms on hulls convert to feet for dock clearances.
- Fishing charts list depths in fathoms; feet aid gear adjustments.
- Ocean soundings from surveys use fathoms, converted for elevation maps.
- Anchor lines measured in fathoms ensure safe holding in feet equivalents.
Regional Notes
US nautical practices favor fathoms for coastal waters, while UK charts mix with meters. Feet conversions bridge imperial systems across Atlantic routes.
Frequently Asked Questions
Why use fathoms in modern navigation?
Historical lead-line tradition persists for quick depth calls by crew.
Is 1 fathom always 6 feet?
Yes, per international imperial standards.
How precise for decimal fathoms?
Supports 0.01 accuracy for fine measurements like 1.5 fathoms = 9 feet.
Negative values?
Alerts as depths cannot be negative.
Fathoms vs. meters?
1 fathom ≈ 1.8288 meters; use for legacy charts.
Origin of fathom?
Old English for outstretched arms, about 6 feet.
Batch conversions?
Copy-paste values or use presets for multiples.
Scientific notation OK?
Handles 1e3 fathoms = 6000 feet.
References
- NIST Special Publication 330 (2008) – “The International System of Units (SI)”, edited by Barry N. Taylor and Ambler Thompson.
- International Organization for Standardization (1993). ISO Standards Handbook: Quantities and units (3rd edition). Geneva: ISO. ISBN 92-67-10185-4.