Feet to mm conversion instantly converts any length in feet into millimeters and centimeters
precise, fast, and easy to use.
Example: 6.5 feet = 1,981.2 mm (or 198.12 cm) using the standard formula mm = ft × 304.8.
What is the formula for feet to mm?
The feet to mm conversion formula is simple yet extremely accurate.
To convert feet into millimeters, multiply the length value in feet by 304.8 —
since one foot equals exactly 304.8 millimeters.
📐 📐 Formula: 1 foot = 304.8 millimeters
calculated using the Feet to Millimeters Converter.
| Feet | Formula | Result (mm) |
|---|---|---|
| 1 ft | 1 × 304.8 | 304.8 mm |
| 2.5 ft | 2.5 × 304.8 | 762 mm |
| 6.5 ft | 6.5 × 304.8 | 1,981.2 mm |
💡 Tip: Use this conversion when designing, printing, or working with technical specifications that require exact millimeter precision.
Common feet to mm conversion
Quickly find how many millimeters are in common foot lengths — from 2 feet to 12 feet.
Use this quick reference for instant results without manual calculation.
| Feet | Formula (× 304.8) | Result (mm) |
|---|---|---|
| 2 ft | 2 × 304.8 | 609.6 mm |
| 3 ft | 3 × 304.8 | 914.4 mm |
| 4 ft | 4 × 304.8 | 1,219.2 mm |
| 5 ft | 5 × 304.8 | 1,524 mm |
| 6 ft | 6 × 304.8 | 1,828.8 mm |
| 8 ft | 8 × 304.8 | 2,438.4 mm |
| 10 ft | 10 × 304.8 | 3,048 mm |
| 12 ft | 12 × 304.8 | 3,657.6 mm |
💡 Example: 10 feet = 3,048 millimeters — simply multiply 10 × 304.8 for accurate conversion.
Feet and inches to mm conversion
The feet and inches to mm conversion is useful for accurate design and construction measurements.
Both units must be converted into millimeters — using the exact multipliers:
1 foot = 304.8 mm and 1 inch = 25.4 mm.
📐 Formula: (Feet × 304.8) + (Inches × 25.4) = Millimeters
Let’s see two quick examples using the formula manually:
| Feet & Inches | Formula | Result (mm) |
|---|---|---|
| 1 ft 3 in | (1 × 304.8) + (3 × 25.4) | 381.0 mm |
| 1 ft 6 in | (1 × 304.8) + (6 × 25.4) | 457.2 mm |
| 2 ft 4 in | (2 × 304.8) + (4 × 25.4) | 711.2 mm |
| 5 ft 9 in | (5 × 304.8) + (9 × 25.4) | 1,753.6 mm |
Feet and Inches to mm Conversion Chart
This chart provides quick values for fractional conversions (¼, ½, ¾ inch) commonly used in carpentry or metalwork.
| Feet | ¼ in | ½ in | ¾ in |
|---|---|---|---|
| 1 ft | 311.15 mm | 317.5 mm | 323.85 mm |
| 2 ft | 615.95 mm | 622.3 mm | 628.65 mm |
| 3 ft | 920.75 mm | 927.1 mm | 933.45 mm |
💡 Example: 1 foot 6 inches = 457.2 mm — simply multiply and add using the formula above for any fractional measurement.
Accuracy & Conversion Tips for feet to mm
To ensure the most accurate feet to mm conversion, follow these quick guidelines — especially if you’re working in CAD, woodworking, or engineering applications.
- Convert directly in millimeters: Always use exact factors 1 ft = 304.8 mm and 1 in = 25.4 mm to avoid accumulated rounding errors.
- Set your precision level: For general use, round to one decimal (e.g., 457.2 mm). For technical or CAD drawings, keep two or three decimals (e.g., 457.20 mm or 457.200 mm).
- Handle feet and inches carefully: Use the full formula (ft × 304.8) + (in × 25.4) — don’t convert inches to decimal feet unless absolutely necessary.
- Round once at the end: Perform rounding only after completing the entire calculation to maintain consistent accuracy.
- Fractional inch reference: ¼″ = 6.35 mm, ½″ = 12.7 mm, ¾″ = 19.05 mm — common in cabinetry, metalwork, and construction detailing.
- Allow for tolerance: If your project includes fitting tolerance (±1–2 mm), factor it into your layout or drawing dimensions.
Quick reference: 1 ft = 304.8 mm · 6 ft = 1,828.8 mm · 10 ft = 3,048 mm · 1 in = 25.4 mm · ⅛″ = 3.175 mm
Square Millimeters vs Square Feet — Understanding the Difference
It’s important to distinguish between linear feet (length) and square feet (area).
A feet to mm conversion measures straight-line distance, while a square millimeter to square feet conversion deals with surface area.
📏 Example: Converting 600×600 mm tile to square feet.
• Step 1: Area = 600 × 600 = 360,000 mm²
• Step 2: 1 ft = 304.8 mm → 1 ft² = 92,903.04 mm²
• Step 3: 360,000 ÷ 92,903.04 = 3.877 ft²
✅ So one 600×600 mm tile covers about 3.88 square feet.
Always check whether your measurement refers to length (ft ↔ mm) or area (ft² ↔ mm²) — mixing them can cause big errors in flooring, tiling, and design estimates.
FAQs — feet to mm Conversion
What size is 6 ft in mm?
6 feet equals 1,828.8 millimeters (6 × 304.8).
This is roughly the height of a tall doorway or a large fence panel.
What is 4 ft in mm?
4 feet equals 1,219.2 millimeters (4 × 304.8).
A common measurement used for desk height or smaller partitions.
How do I convert feet and inches to millimeters?
Use the full formula: (ft × 304.8) + (in × 25.4).
For example, 5 ft 7 in = (5 × 304.8) + (7 × 25.4) = 1,701.8 mm.
Is 1 foot exactly 304.8 millimeters?
Yes — by international agreement, 1 foot is defined as exactly 304.8 mm.
This standard is maintained by NIST and used globally for precise conversions.
Conclusion & Helpful Conversions
The feet to mm Converter makes it easy to switch between U.S. customary and metric measurements with precise, engineering-grade accuracy.
Whether you’re designing, building, or calculating specs, accurate conversion ensures better fit and fewer errors.
👉 Explore more conversion tools:
🔗 For official measurement definitions and standards, visit the
NIST – U.S. National Institute of Standards and Technology.