Fraction Simplifier
Reduce a fraction to lowest terms, add, subtract, multiply and divide fractions, and convert between fractions and decimals. Free, no sign-up, in your browser.
2/3
0.(6)
2/3
66.(6)%
🔒 Everything is calculated in your browser — nothing is uploaded.
Three things, on one page
Reduce a fraction to lowest terms; turn a decimal back into a fraction; or add, subtract, multiply and divide two fractions. Whichever you pick, the same four answers appear underneath — the fraction in lowest terms, the exact decimal, the mixed number and the percentage — each drawn as a fraction is written on paper, with its own copy button. Arithmetic is the half a fraction page usually leaves out, and leaving it out is what sends somebody to another site halfway through their homework.
Repeating decimals, written the way you write them
0.1666… is a sixth, and reading it as 1666/10000 is a wrong answer given confidently. Type it with dots (0.1666… or 0.1666...) or with brackets (0.1(6)) and it comes back as 1/6. The repeating part has to appear at least twice before it is treated as repeating — 0.3… could be a third or it could be 0.31, and refusing to guess beats guessing wrong. A decimal with no dots is still read literally, so 0.333 is 333/1000.
Exact, not rounded
The decimal it prints back is exact: a third shows as 0.(3), not 0.3333333333, and a seventh as 0.(142857). It comes from long division that watches for the first remainder to come round again, which is where the repeat begins. The arithmetic runs on big integers, so a common denominator larger than a calculator normally survives still gives the right answer — and when a result would need whole numbers too large to be exact, the tool says so instead of showing a plausible wrong one.
How simplifying works
Reducing a fraction divides the top and bottom by their greatest common divisor, which changes how it is written and not what it is worth. The sign always sits on the numerator and the denominator stays positive, so -8/12 and 8/-12 both show as -2/3. A denominator of 0 has no value at all, so the page asks for a non-zero one rather than showing anything.
Frequently asked questions
Can it add or multiply two fractions?
Yes — that is the third mode. Put a fraction in each box, pick +, −, × or ÷, and the answer appears in lowest terms with its decimal, mixed number and percentage. 1/2 + 1/3 is 5/6, and 1/2 ÷ 3/4 is 2/3.
How do I enter a repeating decimal like 0.333…?
Either way you would write it: 0.333… (or 0.333...) with the repeating digits typed at least twice, or 0.(3) with the repeating part in brackets. Both give 1/3. For a repeat that starts later, 0.1(6) and 0.1666… both give 1/6.
Why does 8/12 become 2/3?
Dividing the top and the bottom by their greatest common divisor — 4 in this case — leaves the same value written with the smallest whole numbers. The tool does it the moment you type.
What is a mixed number?
The same value written as a whole number next to a fraction: 7/4 is 1 3/4. The page draws it stacked rather than flat, because 1 3/4 on one line reads as thirteen quarters just as easily as one and three quarters.
Is anything uploaded?
No. Every calculation runs in your browser with JavaScript. Nothing you type is sent anywhere, logged or stored.