3:3

If you mean the ratio 3:3, it simplifies to 1:1.

• Divide both terms by their greatest common divisor (3): 3/3 : 3/3 = 1:1.
• As a fraction: 3/3 = 1.
• As a decimal: 1.0 (or 100% if you convert to a percentage).

If you meant something else by “3:3” (e.g., part of a proportion, a time), provide a bit more context and I’ll tailor the answer.