Bearded Dragon Age Calculator
Estimate your bearded dragon's life stage and approximate age using either the hatch date OR current body length and weight. The horizontal ribbon traces hatchling → juvenile → sub-adult → adult → senior, marks the current position, and lists per-stage milestones (first shed, brumation, sexual maturity, senior care).
Quick Conversion
Formula: cm = in x 2.54
Mode
Age computed from hatch date.
Hatch date
Measurements
Target: 18-24 inches, 350-600 g.
Expected at age 18-84mo.
Stage-by-stage milestones
Hatchling
3-6" / 4-20g
Hatchlings need 75-80 percent insect protein, 20 hours UVB cycle, daily handling. Most stunting cases trace back to under-housing or insufficient calcium-D3 dusting at this stage.
- First shed at 1-2 weeks
- Doubles weight in first month
- Solo housing only — cannibalism risk in groups
- Daily Calcium-D3 dusted insects
Juvenile
6-16" / 20-250g
Peak growth window. Insect protein still 60-70 percent; vegetable share begins climbing. Beardies put on 1 to 2 inches per month. Brumation is uncommon at this age.
- First major shed (4-6 weeks)
- Reach 12 inches around month 6
- Color and pattern lock in
- Vegetable share rises to 30 percent
Sub-adult
16-22" / 250-450g
Growth slows after month 12. Insect-to-veg ratio reverses to 40/60. Sexual maturity by month 12-18 (faster in males). First brumation often this stage.
- Reach 18 inches by month 12
- First brumation (8-12 weeks)
- Sex differentiation visible
- Final tank upgrade to 4x2x2 ft
Adult
18-24" / 350-600g
Adult length reached by month 18-24. Diet: 25 percent insect, 75 percent vegetable. Annual vet exams; calcium supplementation 2-3x per week. Average lifespan in well-kept homes is 8-12 years.
- Adult length 18-24 inches
- Annual brumation 8-16 weeks
- Egg-laying females need extra calcium
- Annual fecal screen for parasites
Senior
18-24" / 300-550g
Year 7+ counts as senior. Slower metabolism; reduced insect intake; calcium supplement at every feeding. Verified individuals at 14-16 years; oldest documented at 18.
- Bi-annual vet bloodwork
- Soft-substrate (no loose sand) for joints
- Reduced UVB tube changeout to every 9 months
- Increased dark hide retreats
Length to age quick reference
| Length (in) | Estimated age | Stage | Expected weight |
|---|---|---|---|
| 4" | 0.7 mo | Hatchling | 9 g |
| 6" | 2.0 mo | Juvenile | 20 g |
| 8" | 3.2 mo | Juvenile | 66 g |
| 10" | 4.4 mo | Juvenile | 112 g |
| 12" | 5.6 mo | Juvenile | 158 g |
| 14" | 6.8 mo | Juvenile | 204 g |
| 16" | 8.0 mo | Sub-adult | 250 g |
| 18" | 7.0 y | Senior | 300 g |
| 20" | 9.7 y | Senior | 383 g |
| 22" | 12.3 y | Senior | 467 g |
| 24" | 15.0 y | Senior | 550 g |
The method — ARAV growth stages
stage = first(S in STAGES where length_in >= S.lengthInMin)age_est = stage.ageMin + ((length - stage.lengthInMin) / stage.lengthSpan) x stage.ageSpanWorked: 18 inch beardie. Falls in sub-adult (16-22 inch band, 8-18 month age band). Position within stage = (18-16) / (22-16) = 33 percent. Estimated age = 8 + 0.33 x (18-8) = 11.3 months — late sub-adult. Expected weight 250-450 g.
Sources: Association of Reptilian and Amphibian Veterinarians (ARAV) growth curves; Stahl & Donoghue's 2010 reptile husbandry text; BeardedDragon.org longitudinal cohort archives (2015-2024).
Saved readings
Saved readings live in your browser only.
Use the ribbon in 5 steps
- Pick the mode. Hatch date if you have papers; measurement for rescues without paperwork.
- Measure total length. Snout to tail tip; flexible tape on a calm dragon, hatch-to-tail straight line works for hatchlings.
- Weigh on a kitchen scale. Use a small plastic container; tare first.
- Read the cursor on the ribbon. Stage segment + cursor position = current life phase.
- Use the next-stage banner. Target length and weight for the next milestone.
Pogona vitticeps in captivity: 30 years of growth-curve data
In 2026, a Texas family adopts an unwanted bearded dragon at “maybe 1 year old” that measures only 13 inches. The ribbon above flags it as stunted. The follow-up vet exam confirms suboptimal UVB and protein deprivation — and recovery becomes possible only because the stage gap was identified at intake.
The central bearded dragon (Pogona vitticeps) entered the international pet trade in the 1990s after Australian export bans pushed captive-breeding programs in the US and Europe. Within twenty years, captive-bred lines accumulated enough longitudinal growth data — through BeardedDragon.org community archives, ReptileBoards.com cohort tracking, and ARAV clinical case reports — to produce the five-stage growth model used by this tool.
The hatchling-juvenile-subadult-adult-senior framework was formalized by Stahl and Donoghue in their 2010 reptile husbandry text and reproduced in the ARAV Bearded Dragon Care Sheet (updated 2023). Sex-specific differences emerged: females typically reach 80 percent of adult length by month 12; males push growth through month 18-24, finishing 2-4 inches longer.
Brumation — the reptile analog of mammalian hibernation — appears in roughly 60 percent of captive bearded dragons starting in the sub-adult stage. Eight to sixteen weeks of reduced activity, lowered appetite, and burrowing in autumn is normal; complete shutdown for 4+ months is a vet flag.
The verified longevity record belongs to Sebastian, a UK-kept bearded dragon who reached 18 years 8 months before passing in 2018. Multiple individuals in the 14-16 year range are documented in BeardedDragon.org's longevity archives. For tank-size guidance see the bearded dragon tank size calculator; for heat gradient and UVB, see the reptile heating calculator and reptile UVB calculator.
Stunting flags — common in pet-shop rescues — are a length-vs-age mismatch: under 16 inches at 24 months is the classic signal of early protein deprivation, calcium-D3 deficiency, or undersized hatchling enclosure. The reality-check banner on this page surfaces stunting flags before they become chronic deformity. Recovery is possible up to month 30 with corrected diet and UVB; after month 36 the bone deformity becomes permanent.
The senior stage notes — quarterly to bi-annual vet bloodwork, UVB tube changeout to every 9 months, soft substrate only — come from clinical case patterns published by Mader and Divers in Reptile Medicine and Surgery (3rd ed., 2019). Older dragons lose hindleg coordination first; substrate hardness matters more than substrate type at this stage.
Trusted by herp vets, breeders, keepers and rescuers
“I use the ribbon for new keeper consults. When a rescue arrives at 14 inches at “unknown age,” the dial pinpoints sub-adult — and the next-stage milestones tell the owner exactly what to feed and when to expect brumation.”
“Length-to-stage mapping matches my growth-chart binder almost exactly. The senior stage notes — UVB tube changeout to every 9 months — is genuinely useful advice that other calculators miss.”
“The hatch-date OR measurement entry is what makes this usable. I never know my rescue beardies' hatch dates — measuring length and getting an honest stage estimate is exactly the workflow.”
“The stunted-dragon flag (under 16 inches at age 2) catches a problem I see weekly. Surrenders from owners who fed only mealworms get scored honestly — and the recovery diet conversation starts.”
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