ft³ (Cubic Feet) → in³ Converter

Cubic Feet to Cubic Inches Calculator

ft3 to in3 Converter

Convert cubic feet to cubic inches instantly with our free ft3 to in3 calculator. Whether you're converting appliance specs from cubic feet to cubic inches, calculating box dimensions for shipping, or verifying product listings, this cubic feet to cubic inches converter gives you accurate results with the full cubic feet cubic inches formula explained. The conversion is simple: multiply by 1,728. Need the reverse? Use the in³ → ft³ tab below.

🏠 Appliances & Fridges📦 Packaging & Boxes🔧 Engineering & Parts

Exact Factor

1 ft³ = 1,728 in³

Primary Formula

× 1,728

Single Inch

1 in³ = 0.000579 ft³

Cubic Feet (ft³)

ft³

Enter cubic feet to convert cubic feet to cubic inches instantly.

Cubic Inches (in³)

8,640 in³

5 ft³ × 1,728 = 8,640 in³

Formula: Cubic Inches = Cubic Feet × 1,728

Cubic Yards

0.185 yd³

Cubic Meters

0.1416 m³

Liters

141.58 L

Milliliters

141,584 mL

💡 Tip

1 cubic foot = 1,728 cubic inches exactly (12 × 12 × 12). No rounding — this is a perfect whole-number conversion.

Key Conversion Facts

• 1 ft³ = 1,728 in³ (exact)
• 2 ft³ = 3,456 in³
• 5 ft³ = 8,640 in³
• Formula: in³ = ft³ × 1,728

Quick Mental Math

Multiply by 1,728 — or break it down: × 1,728 = × 1,000 + × 700 + × 28 Example: 3 ft³ 3 × 1,000 = 3,000 3 × 700 = 2,100 3 × 28 = 84 Total = 5,184 in³ ✓

Appliance Size Reference

• 10 ft³ mini fridge = 17,280 in³
• 18 ft³ fridge = 31,104 in³
• 20 ft³ fridge = 34,560 in³
• 25 ft³ large fridge = 43,200 in³
• 30 ft³ freezer = 51,840 in³

Cubic Feet to Cubic Inches Conversion Table

Quick reference — convert cubic feet to cubic inches for common values.

Cubic Feet (ft³)	Cubic Inches (in³)	Fraction	Common Use
0.125 ft³	216 in³	1/8 ft³	6×6×6 inch cube
0.25 ft³	432 in³	1/4 ft³	Basketball-sized
0.5 ft³	864 in³	1/2 ft³	Shoebox
1 ft³	1,728 in³	1 ft³	Standard unit ⭐
1.5 ft³	2,592 in³	—	Small storage bin
2 ft³	3,456 in³	—	Carry-on luggage
3 ft³	5,184 in³	—	Shipping box
4 ft³	6,912 in³	—	Small chest freezer
5 ft³	8,640 in³	—	Dorm refrigerator
7 ft³	12,096 in³	—	Compact fridge
10 ft³	17,280 in³	—	Mini refrigerator
14 ft³	24,192 in³	—	Small refrigerator
18 ft³	31,104 in³	—	Standard refrigerator
20 ft³	34,560 in³	—	Full-size refrigerator
25 ft³	43,200 in³	—	Large refrigerator
27 ft³	46,656 in³	= 1 yd³	One cubic yard
30 ft³	51,840 in³	—	Large chest freezer
50 ft³	86,400 in³	—	Large storage unit
100 ft³	172,800 in³	—	Small room section

Cubic Feet to Cubic Inches — Formula Explained

The Standard Formulas

ft³ → in³:   in³ = ft³ × 1,728
in³ → ft³:   ft³ = in³ ÷ 1,728

Decimal factor:
1 ft³ = 1,728 in³      (exact)
1 in³ = 0.000578704 ft³

Where does 1,728 come from?

The cubic feet to cubic inches formula comes from one simple fact: 1 foot = 12 inches When you convert volume, you cube the linear relationship: Linear: 1 ft = 12 in Area: 1 ft² = 12² = 144 in² Volume: 1 ft³ = 12³ = 1,728 in³ 1,728 = 12 × 12 × 12 = 144 × 12 = 1,728 ✓ (exact, no rounding)

✓ This conversion is perfectly exact. Unlike metric conversions that use approximations (for example, 35.3147 for m³→ft³), the ft³ ↔ in³ conversion involves only whole numbers — no decimal rounding ever.

Example 1: Refrigerator Spec Sheet

A refrigerator is listed as 20 ft³. A manufacturer needs the spec in cubic inches.

Step 1: Formula: in³ = ft³ × 1,728

Step 2: in³ = 20 × 1,728

Step 3: in³ = 34,560

Result: 20 ft³ = 34,560 cubic inches

This is a standard full-size family refrigerator.

Example 2: Shipping Box Comparison

You need to compare two boxes: Box A = 3 ft³, Box B = 5,000 in³. Which is bigger?

Box A: 3 ft³ × 1,728 = 5,184 in³

Box B: 5,000 in³

Result: Box A (5,184 in³) > Box B (5,000 in³)

Box A is larger by 184 in³ (0.106 ft³)

Convert to the same unit first — always.

Example 3: Engine Displacement Conversion

A 5.7L engine is listed as 5.7 liters. A parts catalog lists clearance volumes in cubic feet. Convert 5 ft³ to in³.

Step 1: Formula: in³ = ft³ × 1,728

Step 2: in³ = 5 × 1,728

Step 3: in³ = 8,640

Result: 5 ft³ = 8,640 in³

Note: For reference, 5.7L ≈ 347.8 in³ engine displacement — much smaller than 5 ft³.

When Do You Need to Convert Cubic Feet to Cubic Inches?

Six common scenarios where ft³ → in³ conversion is essential.

Appliance Shopping & Spec Comparison

Refrigerators, freezers, microwaves, and dishwashers are sold in cubic feet in the US. But manufacturer spec sheets and import documents often list internal dimensions in cubic inches or millimeters.

• Verify that a listed ft³ rating matches actual measured dimensions
• Compare products across different unit systems
• Check if an appliance fits a specific space

Example: 20 ft³ fridge = 34,560 in³ Verify: if internal dims are 24×24×30 in, that's 17,280 in³ — only 10 ft³. Check the listing.

Packaging & Dimensional Weight Shipping

Shipping carriers calculate dimensional weight using cubic inches. If you know your package volume in cubic feet, convert to in³ to estimate carrier charges accurately.

• Convert package volume into carrier-ready input
• Estimate DIM weight before label purchase
• Catch underpriced or oversized packaging

DIM weight formula: in³ ÷ 139 Example: 3 ft³ × 1,728 = 5,184 in³ DIM weight = 5,184 ÷ 139 ≈ 37.3 lbs

Mechanical Parts & Engineering Specs

Technical drawings and parts catalogs sometimes mix cubic feet and cubic inches depending on scale. Converting between them keeps material and clearance calculations consistent.

• Hydraulic cylinder displacement
• Pneumatic system volume calculations
• Casting and mold volume estimation
• Fluid reservoir sizing

Example: A hydraulic reservoir spec calls for 2.5 ft³ capacity = 4,320 in³. That helps select the right tank dimensions.

Small Construction & DIY Projects

When inch-based measurements dominate a project, converting your ft³ volume target to in³ can make the rest of the math easier to keep in one unit system.

• Keep formwork math in inches
• Compare required volume against actual form capacity
• Avoid mixed-unit mistakes in small pours

Example: You need 3 ft³ total = 5,184 in³. One 18×18×12 inch form holds 3,888 in³. 5,184 ÷ 3,888 = 1.33 forms → pour 2 forms to be safe.

3D Printing & Additive Manufacturing

3D printer build volumes are often listed in cubic inches or millimeters. Converting from ft³ to in³ helps normalize batch planning and material budgeting.

• Plan batch jobs in a unit your slicer understands
• Budget resin or filament consumption
• Compare machine capacity with production targets

Example: 0.5 ft³ of parts = 864 in³. At $0.10 per in³ of resin, total material cost is about $86.40.

E-Commerce & Product Listings

Online sellers often describe products in cubic feet but platforms and fulfillment tools ask for cubic inches in the backend. Converting keeps listings and shipping tools aligned.

• Amazon FBA cubic inch requirements
• eBay shipping calculator inputs
• Walmart Marketplace product specs
• Freight class calculations for LTL shipping

Example: A storage ottoman listed as 2.5 ft³ = 4,320 in³. Enter that value into carrier or platform dimension fields.

Common Cubic Feet to Cubic Inches Values

Click any card to use this value in the calculator above.

Frequently Asked Questions

Common questions about converting cubic feet to cubic inches.

How do you convert cubic feet to cubic inches?

Multiply the cubic feet value by 1,728:

in³ = ft³ × 1,728

This works because 1 foot = 12 inches, and volume conversion requires cubing that relationship: 12 × 12 × 12 = 1,728

Examples: • 1 ft³ × 1,728 = 1,728 in³ • 5 ft³ × 1,728 = 8,640 in³ • 20 ft³ × 1,728 = 34,560 in³

How many cubic inches are in 2 cubic feet?

2 cubic feet = 2 × 1,728 = 3,456 cubic inches.

To visualize, a box that is 2 cubic feet could be: • 24 × 18 × 8 inches • 18 × 16 × 12 inches • 12 × 12 × 24 inches

All of these have the same volume: 2 ft³ = 3,456 in³.

What is the formula for cubic feet to cubic inches?

The cubic feet cubic inches formula is:

Cubic Inches = Cubic Feet × 1,728

Where 1,728 = 12³ (twelve cubed).

This is an exact formula — no approximation needed. The reverse formula is: Cubic Feet = Cubic Inches ÷ 1,728

How many cubic inches is a 20 cubic foot refrigerator?

A 20 cubic foot refrigerator has an internal volume of: 20 × 1,728 = 34,560 cubic inches

To put that in perspective, 34,560 in³ could be a box measuring: • 24 × 24 × 60 inches • 30 × 24 × 48 inches

Most full-size family refrigerators range from 18–25 ft³ (31,104–43,200 in³).

Why is 1 cubic foot equal to 1,728 cubic inches?

Because 1 foot = 12 inches, and volume is three-dimensional:

1 ft³ = 1 ft × 1 ft × 1 ft = 12 in × 12 in × 12 in = 1,728 in³

The number 1,728 is 12 cubed (12³). This is why the conversion factor is always exactly 1,728 — it is a mathematical certainty, not an approximation.

How do I convert cubic feet to cubic inches for a box?

Two methods — both give the same answer:

Method 1 — If you know the ft³ volume: Multiply by 1,728 Example: 3 ft³ × 1,728 = 5,184 in³

Method 2 — If you know the box dimensions in inches: Measure L × W × H in inches Example: 24 × 18 × 12 = 5,184 in³

Both methods give 5,184 in³ for a 3 ft³ box. Use Method 1 when you already have the ft³ value. Use Method 2 when you have physical measurements.

What common items are measured in cubic inches vs cubic feet?

Cubic Inches (in³) is typically used for: • Engine displacement • Small mechanical parts and components • Shipping carrier dimensional weight calculations • 3D printer build volumes • Small appliance internal specs

Cubic Feet (ft³) is typically used for: • Refrigerators and freezers • Storage units and closets • HVAC and air conditioning capacity • Concrete and construction volumes • Moving truck and storage container capacity

When specs cross between these worlds, our cubic feet to cubic inches calculator bridges the gap instantly.