Formula
Decimal feet = inches ÷ 12. Whole feet = floor(inches ÷ 12). Remaining inches = inches − whole feet × 12. Optional planning feet = (inches + allowance inches) ÷ 12.
Inches to Feet Calculator
Convert inches to decimal feet and mixed feet-and-inches for measurements, cut lists, height records and classroom worksheets.
Worked example
For 70 inches, divide 70 by 12 to get 5.8333 decimal feet. The whole-foot form is 5 feet with 10 inches remaining, because 5 × 12 = 60 and 70 − 60 = 10.
Professional note
Master’s Tip: use decimal feet for spreadsheets and material totals, but print the mixed feet-and-inches result for tape-measure work. A cut list that says 5 ft 10 in is harder to misread on site than 5.8333 ft alone.
Regional and unit assumptions
Basis: 1 foot = 12 inches exactly in the international foot system. The metric cross-check uses 1 inch = 2.54 centimetres exactly. No trade compliance or product pack-size rule is implied.
Assumptions and limitations
- One international foot is exactly 12 inches.
- The entered inches are treated as a measured length, not an area or volume.
- The optional allowance is a practical planning note and is not part of the exact unit definition.
- Rounding is for display only; keep the original inch measurement for audit, quote or classroom records.
Methodology & Accuracy
How this calculator is checked
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Formula used
Decimal feet = inches ÷ 12. Whole feet = floor(inches ÷ 12). Remaining inches = inches − whole feet × 12. Optional planning feet = (inches + allowance inches) ÷ 12.
Standard or basis
Basis: 1 foot = 12 inches exactly in the international foot system. The metric cross-check uses 1 inch = 2.54 centimetres exactly. No trade compliance or product pack-size rule is implied.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.Master's Tip
Master’s Tip: use decimal feet for spreadsheets and material totals, but print the mixed feet-and-inches result for tape-measure work. A cut list that says 5 ft 10 in is harder to misread on site than 5.8333 ft alone.
Related calculators
Questions
How do you convert inches to feet?
Divide inches by 12. For example, 70 inches ÷ 12 = 5.8333 feet.
What is 70 inches in feet and inches?
70 inches is 5 feet 10 inches because 5 feet is 60 inches and 10 inches remain.
Why does the calculator show decimal feet and feet plus inches?
Decimal feet are useful in spreadsheets and estimates, while feet plus inches are easier to read on tape measures, height records and cut lists.
Should I add allowance before converting inches to feet?
Convert the measured inches first, then record any allowance as a separate planning line so the source measurement stays clear.
Calculation note
Inch-to-foot conversion is a small but common measurement bridge. It turns a single tape-measure or product-dimension number into decimal feet for estimates and mixed feet-and-inches for human reading, while keeping the exact 12-inch relationship visible.
The foot and inch relationship is fixed for modern conversion
For everyday modern conversion, the calculator can use a clean exact relationship: one foot contains twelve inches. That makes inch-to-foot conversion deterministic for height records, product dimensions, carpentry notes, classroom work and quote worksheets.
Decimal feet and mixed feet-and-inches answer different jobs
Decimal feet work well when a number needs to be multiplied, summed or copied into estimating software. Mixed feet and inches work well when a person is reading a tape measure, checking a height or marking a cut. Showing both reduces transcription mistakes.
Allowances should stay visible
Clearance, kerf, tolerance, trimming and installation allowances are practical decisions. They should be written beside the exact conversion rather than baked invisibly into the unit result. That is why the printable report keeps measured inches and allowance inches separate.
Sources and further readingNIST Handbook 44 Appendix C: General Tables of Units of MeasurementNIST: SI units and metric relationships