How to use the recurring decimal to fraction calculator
Prepare the values for this calculation
Convert a decimal with a specified repeating digit block into an exact fraction. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.
Enter and check each input
- Whole-number part: enter a finite number. Use the unit named in the label or selected above. Do not leave this required field blank.
- Non-repeating decimal digits: replace the example with your text, keeping the format described in the input table.
- Repeating digits: replace the example with your text, keeping the format described in the input table.
The input table gives a complete example. Keep units and time periods consistent across related fields.
Calculate and resolve any input error
Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.
Interpret the answer
Check Exact fraction first. With the unchanged example inputs, it is 1/6. Interpret it using the formula and assumptions on this page.
Compare and keep a useful result
The result diagram shows the inputs, method and output. A numeric chart is shown only when the calculation supports a meaningful numeric relationship.
Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.
Recurring Decimal to Fraction Calculator formula
The repeating block is converted algebraically using powers of ten and reduced by the greatest common divisor.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Whole-number part | Number | 0 |
| Non-repeating decimal digits | Number | 1 |
| Repeating digits | Number | 6 |
Worked example
Using the example inputs above, the exact fraction is 1/6.
- Exact fraction
- 1/6
Results and assumptions
The output uses the exact fraction convention and formula shown above. Match the entered units and source assumptions when comparing results.
Fix an input or unexpected result
Whole-number part is required. Enter whole-number part using the format and bounds in the input table. Zero and an empty field are different: use zero only if it is allowed and represents your data.
If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.
If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.