Construction unit converter: feet-inches, kN, psi, cfm and more
Type one value and see it in every unit of its category, with feet-inches written the way Revit shows them. Built for architects and engineers who work across metric and imperial drawings and Revit families.
Feet-inches to 1/64″12 AEC categoriesExact definitionsCopy any valueNothing to install
Convert
Feet-inches you can type
- 5' 3 1/2" or 5'-3 1/2"
- 5-3-1/2 or 5 3 1/2 (feet, inches, fraction)
- 63.5" inches or 5.29' feet
- -2' 6" for negative values, such as levels below zero
Results show Revit's "feet and fractional inches" style, 5' - 3 1/2", with the fraction reduced.
All length units
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| Unit | Value | Copy |
|---|
Values show up to 6 significant digits. Copy gives a plain number without thousands separators.
Need Revit families that work in metric and imperial projects?
Browse Revit familiesConvert in three steps
Pick a category
Length, area, volume, mass, force, pressure and stress, flow, power, temperature, illuminance, slope or density.
Type a value
Choose the unit you have and type the number. For lengths you can type 5′ 3 1/2″, 5-3-1/2 or 63.5″ directly.
Copy what you need
Every unit of the category updates as you type. Copy gives a plain number without thousands separators, ready for Revit or Excel.
The definitions behind every result
| Unit | Definition | SI value |
|---|---|---|
| 1 inch | exact by definition | 25.4 mm |
| 1 foot | 12 in | 304.8 mm |
| 1 pound (mass) | exact by definition | 0.45359237 kg |
| Standard gravity | exact by definition | 9.80665 m/s² |
| 1 pound-force | 1 lb × 9.80665 m/s² | 4.4482216 N |
| 1 kip | 1,000 lbf | 4.448222 kN |
| 1 psi | 1 lbf/in² | 6.894757 kPa |
| 1 psf | 1 lbf/ft² | 47.88026 Pa |
| 1 kgf/cm² | 9.80665 N/cm² | 98.0665 kPa |
| 1 US gallon | 231 in³ | 3.785411784 L |
| 1 cfm | 1 ft³/min | 0.4719474 L/s |
| 1 gpm (US) | 1 US gal/min | 0.0630902 L/s |
| 1 BTU (IT) | International Table BTU | 1,055.05585262 J |
| 1 ton of refrigeration | 12,000 BTU/h | 3.516853 kW |
| 1 hp (mechanical) | 550 ft·lbf/s | 745.6999 W |
| 1 foot-candle | 1 lm/ft² | 10.76391 lx |
Inch, foot and pound follow the 1959 international yard and pound agreement. Values match NIST Special Publication 811, Appendix B. Results show up to 6 significant digits.
How Revit writes feet and inches
With the Feet and fractional inches length format, Revit shows a length as feet, a dash with a space on each side, then inches and a reduced fraction:
The fraction is rounded to the precision set in Manage > Project Units > Length, so 11 15/16″ rounded to 1/8″ becomes 1′ – 0″. This converter uses the same style and lets you pick 1/2″ to 1/64″ rounding. It also shows decimal feet and decimal inches, which is what Revit formulas and Dynamo work with.
Typing a plain number in a feet-inches field reads it as feet, as Revit does. Use 63.5″ for inches.
Unit conversion questions
Turn the length into inches, then multiply by 25.4, which is exact. For 5′ 3 1/2″: 5 × 12 + 3.5 = 63.5 in, and 63.5 × 25.4 = 1,612.9 mm. To go back, divide millimetres by 25.4 for inches, then take whole feet out by dividing by 12.
One kip is 1,000 pounds-force, which is 4.448222 kN. One kN is 0.224809 kip, so 100 kN is about 22.48 kip. A kip is a force, not a mass; for mass, 1 short ton is 907.18 kg.
Multiply psi by 0.00689476 to get MPa, or multiply MPa by 145.038 to get psi. So 4,000 psi concrete is 27.58 MPa. One N/mm² is exactly 1 MPa.
Multiply cfm by 0.471947 to get litres per second, or multiply L/s by 2.11888 to get cfm. So 1,000 cfm is about 472 L/s. For cubic metres per hour, 1 cfm is 1.699 m³/h.
For a slope of 1:n, the grade is 100 ÷ n percent and the angle is atan(1 ÷ n). A 1:12 ramp is 8.33% or 4.76°. A 45° slope is 100% or 1:1, and a 4/12 roof pitch is 33.3% or 18.43°.
No. A ton of refrigeration is a cooling rate of 12,000 BTU/h, or 3.517 kW, from the heat needed to melt one short ton of ice in a day. A metric ton (tonne) is a mass of 1,000 kg. The converter keeps them in separate categories.
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