Number base converter
Convert integers exactly between bases 2–36, including negative and very large values, with common base results shown together.
Fraction calculator
Add, subtract, multiply or divide fractions exactly, then see the reduced fraction, mixed number and decimal approximation.
About this tool
Check fraction arithmetic or ratios while keeping the exact answer separate from its decimal approximation.
How to use
Enter both numerators and denominators, including negative integers if needed. Select +, −, × or ÷; the result is calculated immediately and reduced to lowest terms. Copy the exact fraction.
Big-integer arithmetic keeps large values exact. A denominator cannot be zero, and division by a zero fraction is rejected. Decimal output is truncated to 12 places and marked approximate when it does not terminate there. Each integer input supports up to 256 digits.
Common questions
Why is the decimal marked approximate?
The reduced fraction uses exact integer arithmetic. Decimal output is truncated to 12 places; a remaining fractional part triggers the approximation mark. Zero denominators are rejected.
How do I enter a mixed number such as 2 1/3?
Convert it to an improper fraction: enter 7 as the numerator and 3 as the denominator. Each field accepts an integer, so 1.5 should be entered as 3 over 2. Negative numerators or denominators are accepted; the result normalizes the sign.
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