Convert animal age to human-equivalent age across mouse, rat, and zebrafish. Cross-species comparison, bidirectional conversion, strain-specific lifespan factors, and life-stage classification.
Try it out
Load example animal age converter data to see the full workflow
Equivalent biological age across all species (anchored to 28 human years)
| Species | Strain | Age (days) | Age (months) | Life Stage | Lifespan % |
|---|---|---|---|---|---|
| Mouse(input) | C57BL/6J | 126 | 4.1 | Young adult (6 wk–6 mo) | 16% |
| Rat | Sprague-Dawley | 328 | 10.8 | Mature adult (6–12 mo) | 36% |
| Zebrafish | AB | 311 | 10.2 | Young adult (3–12 mo) | 24% |
Don't use for
Multi-model aging studies are increasingly common, but comparing cohorts across species requires standardized age equivalence. A "middle-aged" mouse (12 months) is not the same biological age as a "middle-aged" rat (12 months) or zebrafish (18 months).
This calculator provides a common denominator — human-equivalent age — so you can design comparable cohorts across species. Enter your age in any species and see the equivalent in all others.
Stop manually labeling cohort ages. ConductColony tracks each cage's DOB and tags life-stage transitions automatically.
Open app →Ventilated racks, breeding cages, and aging colony systems for rodent and aquatic facilities
Browse →Get a quote on equipment or talk to our team.
Request quote →