What this calculator does
Guinea pig & hamster age works out human-equivalent age for a guinea pig or hamster from published veterinary age charts. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaHuman-equivalent age from a published non-linear age chart, interpolated between the listed points
The inputs explained
| Field | What to enter |
|---|---|
| Animal | Choose from Guinea pig, Hamster. |
| Pet's age (months) | A number, measured in months. Starts at 12. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with pet's age
Every other input is held at the calculator’s starting values while pet's age varies. Select any row to load that scenario into the calculator.
How the answer changes with pet's age
| Pet's age (months) | Human-equivalent age | Pet's age in years | Chart used |
|---|---|---|---|
| 6 | 32.0 years | 0.50 years | Published guinea pig / hamster age-conversion chart (non-linear: faster ageing early in life, slower later) |
| 9 | 41.0 years | 0.75 years | Published guinea pig / hamster age-conversion chart (non-linear: faster ageing early in life, slower later) |
| 12 | 50.0 years | 1.00 years | Published guinea pig / hamster age-conversion chart (non-linear: faster ageing early in life, slower later) |
| 18 | 59.0 years | 1.50 years | Published guinea pig / hamster age-conversion chart (non-linear: faster ageing early in life, slower later) |
| 24 | 68.0 years | 2.00 years | Published guinea pig / hamster age-conversion chart (non-linear: faster ageing early in life, slower later) |
| 36 | 92.0 years | 3.00 years | Published guinea pig / hamster age-conversion chart (non-linear: faster ageing early in life, slower later) |