Converter
By definition, 1 year = 12 months. This tool supports decimal years or separate year and month inputs. Choose a rounding mode if you need integers or fixed precision.
History
Add calculations to history then download as CSV for records or analysis.
| When | Input | Mode | Rounding | Precision | Months | Actions |
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How the conversion works
Calendar months are counted directly from years using a constant factor of 12. Decimal years multiply by 12 to produce decimal months. If you provide separate years and months, they are combined as years + months/12 before conversion. Rounding options let you return whole months or fixed decimal places.
- None: return a precise decimal.
- Round: round to the chosen number of decimals.
- Floor: move down to the nearest step.
- Ceil: move up to the nearest step.
FAQs
1) What is the exact relationship between years and months?
By convention there are exactly 12 calendar months in a year. This tool multiplies years by 12 to convert to months.
2) Does this account for leap years?
No. Leap years add a day, which affects day counts, not the number of months. Months are calendar units and remain 12 per year.
3) Can I enter partial years?
Yes. Decimals are supported. For example, 1.75 years becomes 21 months if no rounding is applied.
4) Why would I use rounding?
Some schedules require whole months or a specific number of decimal places. Choose a rounding mode to fit reporting or planning rules.
5) What do the two input modes do?
Decimal years accepts a single value like 2.5. Years + months accepts integer or decimal values for each and combines them automatically.
6) How do I share a calculation?
Use the Share button to copy a link that includes your inputs and rounding options. Opening the link restores the same settings and computes the result.