Precision & Rounding Explorer
Understand different rounding methods, significant figures, and how decimal precision affects calculations in programming and mathematics.
Number Input
Rounding Methods Comparison
Rounding Methods Explained
Round Half Up
Standard rounding: 0.5 rounds up to 1. Most common in everyday use.
2.5 → 3, 2.4 → 2
Round Half Down
0.5 rounds down. Less common but used in some financial calculations.
2.5 → 2, 2.6 → 3
Banker's Rounding
0.5 rounds to nearest even number. Reduces cumulative rounding errors.
2.5 → 2, 3.5 → 4
Common Pitfalls
Floating-point errors. 0.1 + 0.2 ≠ 0.3 in most programming languages due to binary representation.
Cumulative errors. Repeated rounding in calculations can lead to significant drift from true values.