How to Use Float Calculator
Enter two numbers and choose add, subtract, multiply, or divide. The calculator shows the raw JavaScript Number result, the operation that was performed, and a rounded display value. Division by zero is rejected. Try examples such as 0.1 + 0.2 to see how binary floating-point arithmetic differs from decimal arithmetic.
Formula & Theory - Float Calculator
JavaScript Number values use IEEE-754 double-precision binary floating point. Many decimal fractions cannot be represented exactly in base 2, so operations may produce results such as 0.30000000000000004. This tool intentionally exposes that behavior instead of hiding it completely, then adds a rounded value for readability.
result = a + b | a - b | a * b | a / b
rounded = Number(result.toPrecision(12))Use Cases for Float Calculator
Use it to demonstrate floating-point precision, debug calculator or finance code, compare raw and rounded arithmetic, explain why decimal libraries may be needed, or create small examples for JavaScript and computer-science lessons.