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12 inches in a foot — divide and you’re done
Converting inches to feet is straightforward: divide by 12. Whether you’re reading a blueprint, measuring fabric or interpreting a spec sheet, this calculator handles the division instantly and returns either decimal feet or a feet-and-inches breakdown.
The formula
ft = in ÷ 12
- in — the length in inches.
- ft — the equivalent length in feet (decimal).
- 12 — the fixed ratio: 1 foot = 12 inches exactly.
For a feet-and-inches result: whole feet = ⌊in ÷ 12⌋; remaining inches = in − (whole feet × 12).
Worked example
Using the default of 5 inches:
- Divide by 12: 5 ÷ 12 = 0.4167 ft.
- In feet-and-inches notation: 0 ft 5″.
A more common example — 70 inches:
- 70 ÷ 12 = 5 remainder 10 → 5′10″.
Conversion table
| Inches | Feet (decimal) | Feet & Inches |
|---|---|---|
| 12 | 1.000 | 1′0″ |
| 18 | 1.500 | 1′6″ |
| 24 | 2.000 | 2′0″ |
| 36 | 3.000 | 3′0″ |
| 48 | 4.000 | 4′0″ |
| 60 | 5.000 | 5′0″ |
| 66 | 5.500 | 5′6″ |
| 70 | 5.833 | 5′10″ |
| 72 | 6.000 | 6′0″ |
| 84 | 7.000 | 7′0″ |
| 96 | 8.000 | 8′0″ |
| 120 | 10.000 | 10′0″ |
History & standards
Measuring length in feet and inches dates back to at least ancient Rome (the Roman foot, or “pes”, was ~29.6 cm; the “uncia” was 1/12 of it). English customary measurement standardized the foot as 12 inches and the yard as 3 feet. The modern international foot was pinned to the metric system by the 1959 International Yard and Pound Agreement: 1 ft = 0.3048 m exactly, making 1 in = 25.4 mm exactly. NIST retired the US survey foot in 2023.
Common applications
- Height & body measurement. Tape measures read in inches; many weight/fitness apps need the feet equivalent.
- Carpentry & construction. Stud lengths and joist spans are measured in inches; framing calculations use feet.
- Fabric & sewing. Pattern seam allowances are in inches; total yardage is expressed in feet or yards.
- Display sizing. Screen size given in total diagonal inches; room fit is estimated in feet.
- Athletics. Track and field marks (long jump, high jump) are often published in both inches and feet.
Reverse conversion
To convert feet back to inches, multiply by 12: in = ft × 12. Use the feet to inches calculator.
Limitations & gotchas
- Decimal feet output. The calculator returns decimal feet (e.g. 5.833). If you need the feet-and-inches breakdown, divide the decimal part by 1 and multiply by 12 (0.833 × 12 = 10″).
- Non-integer results. Most inch values don’t divide evenly by 12 — the decimal result is exact, not an approximation.
- US survey foot (deprecated 2023). The international foot is now the sole US legal definition.
Sources & references
- NIST SP 811, Guide for the Use of the International System of Units (SI).
- BIPM, The International System of Units (SI), 9th edition.
- 1959 International Yard and Pound Agreement.
- Federal Register Vol. 88, No. 60 (2023) — deprecation of the US survey foot.
FAQs
Divide the number of inches by 12: ft = in ÷ 12. For example, 5 in ÷ 12 = 0.4167 ft. For a cleaner answer, use the feet-and-inches form: 60 in ÷ 12 = 5 ft exactly.
Exactly 12 inches. This ratio has been standard in the English imperial system since the Middle Ages and was codified by the 1959 International Yard and Pound Agreement.
60 ÷ 12 = 5 feet exactly.
72 ÷ 12 = 6 feet exactly.
5 ÷ 12 = 0.4167 ft (or 0′5″ in feet-and-inches notation).
Divide by 12 to get whole feet; the remainder is the inch portion. For example, 70 in ÷ 12 = 5 remainder 10, so 70″ = 5′10″.