Pet Calculators
Vet-quality calculators sourced from WSAVA, AAFP, AAHA, ARAV, AAV, RWAF, ICatCare, NRC, FEDIAF, the Dog Aging Project, and peer-reviewed research. Dose checks, age conversion, calorie planning, gestation tracking, aquarium safety, breed selection, lifetime cost projection - every formula linked to a real standard your vet recognises.
Dog Calculators
22 toolsDog Age in Human Years
UCSD 2020 epigenetic-clock formula: human_age = 16 x ln(dog_age) + 31. Far more accurate than 7x.
Dog BCS Calculator
WSAVA 9-point side-profile silhouette morphing 1-9 with rib + waist + abdominal-tuck overlay.
Dog BMI Calculator
Breed-frame band marker against AKC standard. Male/female ranges with % deviation.
Dog Breed Selector
8-question NLP-style quiz to ranked 40-breed cards via Euclidean vector matching.
Dog Calorie Calculator
RER x activity factor for puppies, adults, working dogs, lactating, weight-loss programs.
Dog Chocolate Toxicity
Theobromine + caffeine mg/kg to mild / moderate / severe / lethal risk band.
Dog Due Date Calculator
Circular whelping countdown with trimester arcs and rotating today marker.
Dog Exercise Calculator
5-axis energy radar (cardio / strength / mental / social / off-leash) vs breed healthy band.
Dog Feeding Calculator
24-hour SVG feeding-schedule timeline with meal blocks + fasting windows.
Dog Food Calculator
Portion-fill kibble bowl with WSAVA RER x life-stage x activity x breed. Bloat warnings.
Dog Gestation Calculator
9-week horizontal timeline with fetal-development milestones each week.
Dog Ideal Calorie for Weight Loss
Half-circle wedge: current kcal vs target deficit vs NRC safe-floor minimum.
Dog Ideal Weight
WSAVA 2020 BCS 1-9 with target weight by breed, frame, and age.
Dog Life Expectancy
Life-stages ribbon with RVC 2019 medians x BCS / neuter / dental / diet modifiers.
Dog Medication Dosage
Circular mg/kg safety dial: Benadryl, Pepcid, Imodium, fish oil. MDR1 + ASPCA APCC warnings.
Dog Pregnancy Calculator
63-day gestation with milestone alerts: implantation, x-ray detection, whelping prep.
Dog Raw Food Calculator
BARF / PMR ratio donut (70/10/10/5/5 or 80/10/10) with per-ingredient grams.
Dog Vaccination Schedule
WSAVA 2024 + AAHA + AVMA vet calendar with status-coded stamps and cost estimates.
Dog Walk Calculator
Distance + duration + kcal burned with brachycephalic heat alerts and rest-break timing.
Dog Water Intake
1 oz per lb body weight plus/minus activity, temperature, food moisture.
Dog Weight Loss Calculator
Stepped ladder with descending silhouette. Safe 1-2%/wk band.
Dog Whelping Calculator
Gestation tracker with mammary-development, nesting, Stage-1 labor alerts.
Puppy Calculators
3 toolsPuppy Feeding Calculator
6-stage age bar with meal-count + portion-by-stage from 0-2 mo through 12+ mo.
Puppy Growth Chart
Dual-line tracker (height + weight) over time with breed expected curves overlaid.
Puppy Weight Predictor
Growth-curve canvas with current point plot, predicted adult weight, 4/6/9/12-month milestones.
Cat Calculators
14 toolsCat Age in Human Years
AAFP/AAHA non-linear feline life-stage curve (kitten, junior, adult, mature, senior, geriatric).
Cat BCS Calculator
WSAVA 9-point feline body condition score with paired top + side silhouette morphing 1-9.
Cat Calorie Calculator
WSAVA RER x life-stage x activity x breed multiplier with concentric calorie-wheel dial.
Cat Food Calculator
Dry-vs-wet portion calculator with ratio slider; grams + cans + cost-per-day.
Cat Gestation Calculator
9-segment rotating polar dial with phase-shaded weeks and vet-call triggers.
Cat Life Expectancy
6-stage life ribbon with indoor-vs-outdoor dramatic bracket (13-17 yr vs 2-5 yr).
Cat Litter Box Calculator
AAFP N+1 box grid with 1.5x body-length per box. Litter type by coat length.
Cat Pregnancy Calculator
63-day queen timeline with 12 fetal milestones (implantation, ultrasound, mammary, nesting, labor).
Cat Raw Food Calculator
Feline PMR 84/10/3/3 donut with taurine + B12 + vitamin E supplementation warning.
Cat Vaccination Schedule
AAFP 2020 vet calendar 0-72w with FVRCP core, Rabies, FeLV non-core stamps.
Cat Water Intake
60 ml/kg target with drinking + wet-food + dry-food moisture stack. CKD-aware.
Cat Weight Loss Calculator
Safe-pace curve (0.5-1%/wk) with hepatic-lipidosis warning if loss too aggressive.
Kitten Growth Chart
Per-breed curve with 11 milestone dots (eyes open, weaning, vaccines, neuter, adult).
Kitten Weight Calculator
Vertical target-weight ladder at weeks 0, 1, 2, 4, 8, 12, 16, 26, 52 with verdict.
Aquarium & Reef
19 toolsAquarium Calculator Pro
All-in-one tank planner: volume, filter GPH, heater wattage, stocking density across freshwater, planted, FOWLR, and reef setups.
Aquarium CO2 Calculator
Henry Law: CO2 ppm = 12.839 x KH x 10^(6.37 - pH). 20-30 ppm planted target with fish-safety warning.
Aquarium Cycle Timer
Nitrogen-cycle timeline (ammonia, nitrite, nitrate) with Stage 1-4 detection and next-test instructions.
Aquarium Evaporation Calculator
Daily/weekly evaporation rate + top-off volume + mineral concentration drift over time.
Aquarium Filter Size Calculator
4-12x turnover by setup type with 20-model catalog (AquaClear, Fluval, Eheim, Oase) at de-rated actual GPH.
Aquarium Glass Thickness Calculator
Pressure-by-depth x safety factor to minimum glass thickness per ASTM E1300.
Aquarium Heater Size Calculator
Watts from tank size times ambient delta times insulation. Two-heater redundancy for tanks at or above 75 gal.
Aquarium Lighting Calculator
PAR/lumens with Beer law depth attenuation. 22-plant database auto-filtered to setup PAR.
Aquarium Salt Calculator
Tonic-salt dose for ich / fin-rot treatment. 5 treatment levels x 6 fish sensitivities (scaleless, shrimp, plants flagged).
Aquarium Stocking Calculator
Walstad-style species-aware bioload curve. Catches schooling shortfalls, predation conflicts, fin-nipper combos.
Aquarium Substrate Calculator
Bag count by tank L x W and substrate type. ADA Aquasoil 9L covers ~25 gal; density per type.
Aquarium Sump Volume Calculator
3-compartment sump (skimmer/refugium/return) volumes + power-outage drainage capacity.
Aquarium Volume Calculator
Tank volume in gallons or liters from L by W by H. Rectangular, bow-front, cube, hex, cylinder.
Aquarium Water Change Calculator
Volume to change + dechlorinator dose (Prime) + nitrate dilution math. Bioload-tier frequency.
Aquarium Weight Calculator
Filled-tank weight (water plus glass plus substrate plus rock). Critical for second-floor safety.
Marine Salt Mix Calculator
Salinity refractometer + scoop dose for Instant Ocean, Red Sea Coral Pro, Tropic Marin Pro, Reef Crystals.
Reef Flow Calculator
Turnover wheel + vortex direction map. MP10/40, Gyre, Koralia, Jebao placement angles.
Reef Lighting Calculator
2D PAR-by-depth heatmap with coral safe zones (SPS 200-400+, LPS 100-200, softies 50-100).
Reef Tank Calculator
Reef ecosystem planner: live rock + sand + circulation + lighting + ongoing weekly maintenance cost.
Reptile Calculators
10 toolsBall Python Tank Size
ARAV per-stage PVC dimensions: hatchling tub to juvenile 40 gal to adult 4ft x 2ft x 2ft.
Bearded Dragon Age
5-segment growth-stage ribbon (hatchling to juvenile to sub-adult to adult to senior).
Bearded Dragon Calorie
Prey/greens split plate with life-stage ratio (hatchling 80/20 to adult 20/80) + supplement schedule.
Bearded Dragon Tank Size
Growing enclosure SVG hatchling to adult. 4ft x 2ft x 2ft adult minimum.
Reptile Heating Calculator
Thermal gradient strip (cool / ambient / basking) with watt-sizing model per species.
Reptile Humidity Calculator
Humidity gradient bar + misting schedule clock with species-specific day/night band.
Reptile UVB Calculator
Ferguson Zone UV-index gauge with inverse-square distance + bulb-age decay model.
Reptile Weight Tracker
Weight history chart with species-aware life-stage healthy-range band overlay.
Snake Enclosure Calculator
Multi-species shape variation (arboreal tall vs terrestrial wide vs semi-aquatic) for 12 species.
Snake Feeding Calculator
10-prey SVG (pinky to jumbo rat) with 10-15% body-weight rule and next-feed date.
Bird Calculators
7 toolsBird Age Calculator
Dual concentric age dial across 14 species in 6 families. Brouwer mass-scaled formula.
Bird Breeding Calculator
5-phase breeding cycle wheel (courtship / egg-laying / incubation / chick-rearing / fledging).
Bird Cage Size Calculator
Scaled cage SVG with bird silhouettes + bar-spacing safety. Budgie 18x18x24 to African Grey 36x24x48.
Bird Calorie Calculator
Balance scale (target kcal vs stacked pellet / seed / veg / fruit). Kleiber 3/4 scaling.
Bird Incubation Calculator
SET to CANDLE to LOCKDOWN to HATCH timeline with temp/humidity safe bands. 16 species.
Bird Weight Tracker
Daily ribbon with plus/minus 5% body-weight band. Bird first sign of illness is weight loss.
Parrot Age Calculator
Species-aware lifespan dial. Macaw 50-80 yr vs Budgie 5-10 yr.
Rabbit Calculators
6 toolsRabbit Age Calculator
180 deg arc-meter with breed-scaled lifespan (Netherland Dwarf 12+ yr vs Flemish Giant 8-10).
Rabbit Food Calculator
Plate split 80% hay / 10% pellets / 5% greens / 5% treats per RWAF + HRS guidelines.
Rabbit Hutch Size Calculator
Top-down hutch + 3-hop visualizer. RWAF rule: 12 sq ft hutch + 32 sq ft exercise.
Rabbit Pregnancy Calculator
31-day kindling timeline (palpation day 10, nest box day 14, kindling day 28-32).
Rabbit Water Intake
Bottle vs bowl daily-fill diagram. 100 ml/kg target x diet x climate factor.
Rabbit Weight Calculator
Breed-frame band marker (Netherland Dwarf 1-2.5 lb to Flemish Giant 14-22 lb).
Pet Finance Tools
6 toolsPet Adoption Cost Calculator
3-path Shelter / Rescue / Breeder comparison ladder with Day-1 cost breakdown.
Pet Budget Calculator
Drag-pie allocator across 8 categories with draggable handles and lockable slices.
Pet Cost Calculator
Lifetime cost stacked-area chart, auto-country: US dog $20K-$50K vs IN dog INR 4L-10L.
Pet Emergency Fund Calculator
4-tier reserve thermometer (fish / cat / dog / exotic) with US ER $1500-$5000 baseline.
Pet Insurance Calculator
3-column tier comparator with claim-probability bars and break-even calculator.
Vet Cost Estimator
Procedure ladder (12 services) with low/median/high range bars per country.
Fun & Personality
9 toolsPet Birthday Calculator
365-segment circular calendar + itemized party-cost meter at 3 scales.
Pet Breed Selector
Species picker to 8-question quiz to ranked breed cards across 60 cross-species breeds.
Pet Compatibility Calculator
Two-pet pairing form + half-circle 0-100 gauge with ASPCA introduction protocols.
Pet Love Language
5-axis radar pentagon (food / time / touch / play / words) from a 10-question Likert quiz.
Pet Name Generator
NLP-style name composer (70% corpus / 30% procedural syllables, seeded for reproducibility).
Pet Personality Test
MBTI-style 4-axis reveal with 16 mythos types. C-BARQ 2003 + Feline Five 2017 sourced.
Pet Size Predictor
Growth-projection cone with mixed-breed uncertainty fan widened 25%.
Pet Zodiac Calculator
12-segment zodiac wheel with Chinese animal centre and species-tailored personality readings.
Universal Pet Age Calculator
Universal species-swappable lifespan dial covering 33 species across 8 groups.
What Pet Pros & Owners Say
“I send clients to these calculators after every appointment. The chocolate toxicity gauge in particular has saved several emergency visits - owners can triage before driving in.”
“Aquarium weight calculator confirmed my floor could handle a 180-gallon reef. Catches the variable everyone forgets: substrate weight. Now I check before every upgrade.”
“Pregnancy calendar with milestone alerts is exactly what my kennel needed. We sync x-ray bookings and whelping prep to the day. Five healthy litters this year.”
“Calorie calculator for my Malinois finally got the activity factor right (2.5 for active police K9 work). Switched feed amounts, dog gained 4 lbs of muscle in 8 weeks.”
Love using our calculator?
Related Articles
Dive deeper with our expert guides and tutorials related to Pet Calculators