The foster method, free
Kitten Age Calculator
This free kitten age calculator estimates a kitten’s age the way rescues and fosters do: eyes, ears, teeth, movement, and weight. A kitten showed up and nobody sent paperwork? Tap what you can observe and get an age range, an estimated birthday, and a card worth sharing.
Tap everything you can observe. Each clue narrows the estimate; you don’t need all of them.
Pick at least one clue above to see the estimate.
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Free, no signup. Built for fosters, rescues, and anyone a kitten just happened to.
Kitten age chart: week by week
| Age | What you’ll see |
|---|---|
| 0 to 1 week | Eyes closed, ears folded, sleeps and nurses. Under 6 oz. |
| 1 to 2 weeks | Eyes begin opening (baby blue), ears start to unfold. 6 to 8 oz. |
| 2 to 3 weeks | Eyes fully open, first teeth erupting, wobbly crawl-walking. 8 to 12 oz. |
| 3 to 4 weeks | Ears upright, walking, baby canines arrive. Around 1 lb. |
| 4 to 6 weeks | Playing, pouncing, starting gruel. Litter training begins. 1 to 1.5 lb. |
| 6 to 8 weeks | Full set of baby teeth, eating solid food, full zoomies. About 1.5 to 2 lb. |
| 2 to 4 months | Eyes change to adult color, rapid growth (about a pound a month). |
| 4 to 7 months | Adult teeth replace baby teeth. Spay/neuter window for many vets. |
Kitten age questions, answered
How can I tell how old a kitten is?
Use the development clues rescuers use: eyes (closed until about 10 days, baby blue until 6 or 7 weeks), ears (folded at birth, upright by 3 weeks), teeth (first baby teeth at 2 to 4 weeks, adult teeth from about 14 weeks), movement (wobbly walking around 3 weeks, playing by 5), and weight (kittens gain roughly a pound a month for the first 6 months). Combining several clues narrows the estimate considerably.
How accurate is a kitten age estimate?
With several clues, usually within a week or two for young kittens. Accuracy matters most under 8 weeks, when feeding and care change fast. For anything medical, or if the clues disagree, a veterinarian can age a kitten precisely by teeth.
Why does a kitten’s age matter so much?
Care changes almost weekly: bottle feeding every few hours for newborns, gruel at 4 to 5 weeks, solid food and litter training by 6 to 8 weeks, first vaccines around 6 to 8 weeks, and spay or neuter timing later. An age estimate is the first thing a foster or finder needs.
I just found a kitten. What do I do first?
Keep it warm (a towel-wrapped bottle of warm water works), do not give cow’s milk, and estimate its age to know whether it needs bottle feeding. Then contact a local rescue or vet. Warmth comes before food, always.
Is this calculator really free?
Completely. No account, no email, and the photo you add to the card never leaves your device. We make custom pet portraits for a living and this is our gift to the kitten people.
Rescues and fosters: put this on your site
Embed it free on your rescue, shelter, or foster resource page. Copy, paste, done.
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<script>window.addEventListener("message",function(e){if(e.origin==="https://www.petpicportraits.com"&&e.data&&e.data.pppEmbed==="kitten-age-calculator"){var f=document.getElementById("ppp-kitten-age-calculator");if(f)f.style.height=e.data.height+"px"}});</script>
<p style="font-size:14px"><a href="https://www.petpicportraits.com/kitten-age-calculator">Kitten age calculator</a> by <a href="https://www.petpicportraits.com">Pet Pic Portraits</a></p>Foster fail? Congratulations.
If this kitten is staying, that first photo deserves a portrait. Free preview in about 30 seconds, hand-reviewed by a real person, nothing prints without your approval.
See your kitten as art (free preview)More free cat tools: the cat age calculator and the cat pregnancy calculator. Or see all free pet calculators.