Area & Volume Calculator
Pick a shape, enter the dimensions, and get the answer in both US customary and metric units — using the exact NIST / SI conversion constants (1 sq in = 6.4516 cm², 1 cu in = 16.387064 cm³).
1. Choose a shape
2. Enter dimensions (inches)
3. Result
Formula used: A = l × w
Conversion: 1 sq in = exactly 6.4516 cm² (1 in = 2.54 cm, squared)
Answers are rounded for readability; the underlying math uses exact constants.
Why two units?
US classrooms and construction use inches and square feet; international math and science use centimeters and square meters. This calculator shows both so you can check your homework answer either way. For larger areas (square feet ↔ square meters) or volumes (cubic feet ↔ cubic meters), use the area and volume converters.
Frequently Asked Questions
How do I convert square inches to square centimeters?
Multiply by the exact constant 6.4516 (1 sq in = 6.4516 cm², because 1 in = 2.54 cm and 2.54² = 6.4516).
What is the difference between area and volume?
Area measures a two-dimensional surface (sq units). Volume measures three-dimensional space (cubic units). A square has area; a cube has volume.
Why do I need to square or cube the conversion factor?
Because conversion factors describe one dimension. Converting inches to cm multiplies by 2.54 once; for area, the factor is applied twice (2.54² = 6.4516); for volume, three times (2.54³ = 16.387064).
Can this calculator replace showing my work?
No — use it to check your answer. Teachers and exams expect you to write out the formula, substitute the values, and show the unit conversion steps.
Study aid disclaimer: this calculator helps you check answers using standard geometry formulas and exact conversion constants. It is not a substitute for showing your work — always write out the formula and steps your teacher expects.