Why feet and inches converter need

You enter a height or length in feet (and optionally inches), the converter applies the exact constants—1 ft = 30.48 cm and 1 in = 2.54 cm—and instantly returns clean results in centimeters (and meters). It can also run in reverse: type centimeters, and it gives you feet + inches.

Why feet and inches both show up

In many places (like the US), measurements are often written as feet + inches, for example 5 ft 7 in. That’s still just a length in inches; we split it for readability. Converting is easy once you remember:

• 1 foot = 12 inches
• 1 inch = 2.54 centimeters
• Therefore, 1 foot = 12 × 2.54 = 30.48 centimeters

So if you give the calculator feet and inches, it first totals everything in inches, then converts those inches into centimeters.

Formulas:

A) Feet & inches → centimeters

1. Convert to total inches:
   total_inches = feet × 12 + inches
2. Convert inches to centimeters:
   centimeters = total_inches × 2.54
3. If you also want meters:
   meters = centimeters ÷ 100

B) Centimeters → feet & inches

1. Convert to total inches:
   total_inches = centimeters ÷ 2.54
2. Whole feet:
   feet = floor(total_inches ÷ 12)
3. Remaining inches:
   inches = total_inches − feet × 12
   (You can round inches to your chosen decimal places.)

C) Feet (decimal) → centimeters
If you enter feet as a decimal (e.g., 5.5 ft), the converter simply does:
centimeters = feet × 30.48

How the Feet to Centimeter converter works

1. Pick direction:
   • “Feet/Inches → Centimeters” if you’ve got ft/in.
   • “Centimeters → Feet/Inches” if you’ve got cm.
2. Choose input mode:
   • Feet only (for decimal feet like 5.5)
   • Feet + inches (for 5 ft 7 in)
3. Enter your values in the right boxes.
4. Set decimal places (rounding). Two decimals are great for most uses.
5. Calculate. You’ll see a small “input/result/also” summary so you can copy the numbers easily.

Examples (ft to cm and cm to ft)

Example 1: 5 ft 7 in → cm

• Total inches = 5 × 12 + 7 = 60 + 7 = 67 in
• Centimeters = 67 × 2.54 = 170.18 cm
• Meters = 170.18 ÷ 100 = 1.7018 m
  Answer: 170.18 cm (≈ 1.70 m if you round to two decimals)

Example 2: 5.5 ft → cm

• This is “feet only” mode.
• Centimeters = 5.5 × 30.48 = 167.64 cm
  Answer: 167.64 cm

Example 3: 170 cm → feet + inches

• Total inches = 170 ÷ 2.54 ≈ 66.9291 in
• Feet = floor(66.9291 ÷ 12) = floor(5.5774) = 5 ft
• Inches = 66.9291 − (5 × 12) = 66.9291 − 60 = 6.9291 in
  Rounded to two decimals: 6.93 in
  Answer: 5 ft 6.93 in (or 5′ 6.93″)

Example 4: 30 cm → feet + inches

• Total inches = 30 ÷ 2.54 ≈ 11.811 in
• Feet = floor(11.811 ÷ 12) = 0 ft (it’s less than a foot)
• Inches = 11.811 in (≈ 11.81 in)
  Answer: 0 ft 11.81 in

Decimal feet vs feet+inches—when to use which

• Feet + inches is perfect for heights and home projects where people think in that format.
• Decimal feet (like 6.25 ft) is convenient for calculations or construction math. The converter supports both, so you can work however you prefer.

Rounding tips

• 2 decimals is a good default—clean yet accurate.
• If you’re working on tight tolerances (e.g., carpentry, fabrication), use 3–4 decimals.
• For a quick estimate (like a rough height), 0–1 decimals is fine.

Common mistakes (and easy fixes)

• Typing inches in the feet box: If you mean 5 ft 7 in, don’t enter 5.7 in the feet field—use feet + inches mode (feet: 5, inches: 7).
• Over-rounding: Rounding too early can cause small mismatches later. Let the converter do the math, then round the final result.
• Negative numbers: Lengths are typically non-negative—stick to zero or positive values.

Quick reference constants

• 1 in = 2.54 cm (exact)
• 1 ft = 12 in
• 1 ft = 30.48 cm (exact)
• 1 m = 100 cm

Bottom line

The Foot to Centimeter Converter is simply applying unchanging, exact constants to your numbers. Enter feet and inches (or decimal feet), hit calculate, and it gives you centimeters (and meters). Or flip it the other way: type centimeters, and it returns a clean feet + inches breakdown. Clear math, flexible input, and results you can use anywhere—from tailoring and fitness to DIY and travel.