A walkthrough, end to end.
- 1
Enter a decimal number — terminating or repeating.
- 2
Optionally mark the repeating block (e.g. 0.16 with 6 repeating).
- 3
See the simplified fraction, mixed number, and exact decimal.
Decimal → fraction
For terminating decimals, multiply by 10ⁿ to clear the decimal point, then divide by 10ⁿ and reduce. For repeating decimals, use algebra: x = 0.aaaa…, 10ⁿx − x cancels the repeat.
What you can do with this.
Cooking measurements
Convert 0.375 cups to 3/8 cup.
Carpentry
Translate 0.625 inches to 5/8".
Math homework
Verify decimal-fraction conversions instantly.
Finance percentages
0.05 = 1/20 — quick exact ratio.
Recipe scaling
0.75 cup × 2 = 1.5 = 1 1/2 cups.
Repeating decimals
0.333… = 1/3, 0.142857… = 1/7.
Engineering specs
Convert decimal inches to standard fractional sizes.
Decimal ↔ fraction 2026 — what's current
Foundational; calculator wins for repeating-decimal handling.
Frequently asked.
Enter the repeating block separately (e.g. non-repeating part 0.1, repeating part 6 → 0.1666…).
Yes — leading minus sign is fine.
Up to ~15 significant digits — JavaScript double precision.
No. All math runs in your browser.