Pet Age to Human Years Calculator
ANA›Life Services Authority›National Calculator Authority›Pet Age to Human Years Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Pet Age to Human Years Calculator
Convert your pet's age into equivalent human years based on species and size/breed category.
Pet's Age (years)
Species
Dog Cat Rabbit Guinea Pig Hamster Bird (Small – Budgie/Canary) Bird (Large – Parrot)
Dog Size / Breed Category
Small (<20 lbs / <9 kg) Medium (20–50 lbs / 9–23 kg) Large (51–90 lbs / 23–41 kg) Giant (>90 lbs / >41 kg)
Calculate —
function toggleSizeField() { var species = document.getElementById('pet-species').value; document.getElementById('pet-size-field').style.display = (species === 'dog') ? 'block' : 'none'; } toggleSizeField();
function calcPetAge() { var ageVal = document.getElementById('pet-age').value.trim(); var species = document.getElementById('pet-species').value; var size = document.getElementById('pet-size').value; var resultEl = document.getElementById('pet-result');
if (ageVal === '' || isNaN(ageVal) || Number(ageVal) 25) { resultEl.style.color = '#c0392b'; resultEl.innerHTML = '⚠ Dog age seems unrealistic (max ~25 years). Please check your input.'; return; } if (species === 'cat' && age > 30) { resultEl.style.color = '#c0392b'; resultEl.innerHTML = '⚠ Cat age seems unrealistic (max ~30 years). Please check your input.'; return; } if (species === 'hamster' && age > 4) { resultEl.style.color = '#c0392b'; resultEl.innerHTML = '⚠ Hamster age seems unrealistic (max ~4 years). Please check your input.'; return; }
var humanYears = 0; var method = '';
// ── DOG (American Veterinary Medical Association / size-adjusted tables) ── // Year 1 = 15 human years; Year 2 = +9; each subsequent year varies by size. if (species === 'dog') { var ratePerYear = { small: 4, medium: 5, large: 6, giant: 7 }; var rate = ratePerYear[size]; if (age ' + '' + humanYears + ' human years' + '' + method + ''; }
#### Formulas Used
Dogs (AVMA): Year 1 = 15 human yrs · Year 2 = +9 human yrs · Each additional year = +4 (small) / +5 (medium) / +6 (large) / +7 (giant) human yrs.
Cats (International Cat Care): Year 1 = 15 · Year 2 = +9 · Each additional year = +4 human yrs.
Rabbits (House Rabbit Society): Year 1 = 18 · Year 2 = +14 · Each additional year = +6 human yrs.
Guinea Pigs: 1 guinea pig year ≈ 14 human years.
Hamsters: 1 hamster year ≈ 25 human years.
Small Birds (Budgie/Canary): 1 bird year ≈ 6 human years.
Large Parrots: 1 parrot year ≈ 1.2 human years.
#### Assumptions & References
- Dog formula based on American Veterinary Medical Association (AVMA) guidelines; size categories affect aging rate after year 2 because larger breeds age faster.
- Cat formula from International Cat Care (iCatCare) / Feline Advisory Bureau life-stage chart.
- Rabbit formula from the House Rabbit Society age-equivalency guide.
- These are estimates; individual animals vary based on genetics, diet, and veterinary care.
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