Rectangle Volume Calculator
Calculate rectangular prism and box volume from length, width, and height. Switch to liters or litres for capacity answers, or reverse the formula to solve for a missing side.
Why this page exists
This page is focused on rectangle volume calculator, box volume calculator, and dimensions to liters intent. If you want the older all-in-one rectangular volume page, you can also use Volume Calculator.
Rectangle Volume
Best for queries like rectangle volume calculator and volume of a rectangle calculator.
Box Volume in Liters
Switch the output to liters or litres for box volume calculator and dimensions to liters use cases.
Find Missing Dimension
Reverse the formula when you know the target capacity and two sides but need the missing length, width, or height.
Quick liters shortcut: Liters = (L × W × H in cm) / 1000
Rectangle volume formula
Volume = Length × Width × Height
Use this for rectangular prisms, boxes, rooms, bins, and shipping cartons.
Convert dimensions to liters
Liters = (L × W × H in cm) / 1000
When the dimensions are in meters, multiply by 1000 instead of dividing by 1000.
Rectangle volume formula
For any rectangular prism, cuboid, carton, or box, the formula is the same: multiply length, width, and height. The answer is always a cubic measurement first. If you need a fill-capacity answer, convert that cubic result to liters, milliliters, or gallons.
Volume formula
Volume = Length × Width × Height
Dimensions to liters quick guide
When dimensions are in centimeters
Liters = (L × W × H in cm) / 1000
Example: 50 × 40 × 30 cm = 60,000 cm³ = 60 L.
When dimensions are in meters
Liters = (L × W × H in m) × 1000
Example: 0.5 × 0.4 × 0.3 m = 0.06 m³ = 60 L.
When to use missing-dimension mode
Use the reverse-calculation mode when you already know the target capacity of a box, room, bin, or shipping carton but one side is unknown. This is useful for packaging design, storage planning, aquariums, and classroom word problems.
Frequently asked questions
How do you calculate rectangle volume?
For a 3D rectangular shape, multiply length × width × height. A flat rectangle has area, not volume, so searchers usually mean a rectangular prism, cuboid, or box.
Can I use this as a box volume calculator?
Yes. Enter the box length, width, and height in any supported unit and choose the output unit you need, including liters, cubic feet, cubic inches, or gallons.
How do I convert dimensions to liters?
If your dimensions are in centimeters, multiply length × width × height and divide by 1000. If your dimensions are in meters, multiply the cubic-meter result by 1000 to get liters.
Can this calculator find a missing length, width, or height?
Yes. Use the missing-dimension mode when you know the target volume and two sides. The calculator rearranges the formula so you can solve for the remaining side.
What is the difference between rectangle volume and box capacity?
They use the same formula. Rectangle volume is the geometric measurement in cubic units, while box capacity usually refers to the same result expressed in liters, gallons, or another fill unit.
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