# Husbandry numbers you can verify, for every pet you keep > Free, source-linked calculators, guides, and industry intel. Categories: Dogs & Cats · Reptiles · Aquariums · Small pets · Birds ## Evidence - **58 tools** - **8 industry feeds tracked** — [/intel/](https://petguidecalc-web-dev.pages.dev/intel/) - **23 cited sources** — [/sources/](https://petguidecalc-web-dev.pages.dev/sources/) ## Why trust the numbers ### [Named, checkable sources](https://petguidecalc-web-dev.pages.dev/sources/) Calculator values come from peer-reviewed studies, veterinary guidelines, and institutional care standards, and each tool links the sources behind its numbers. ### [A public corrections log](https://petguidecalc-web-dev.pages.dev/corrections/) Material corrections are published with the date, the pages affected, and the editorial outcome, so changes are auditable rather than silent. ### [Review dates on every tool](https://petguidecalc-web-dev.pages.dev/tools/#how-it-works) Each tool carries the month it was last editorially reviewed and states its units and assumptions, with the methodology explaining how every number is derived. ## Tools ### [UVB Calculator](https://petguidecalc-web-dev.pages.dev/reptile/uvb-calculator/) Estimate the mounting distance and UV index for a T5 HO, T8, or compact UVB bulb across six common reptile species. ### [Heat Lamp Wattage Calculator](https://petguidecalc-web-dev.pages.dev/reptile/heating-wattage-calculator/) Find a starting heat lamp wattage by species, enclosure height, and room temperature, rounded to standard 40/90/100 W halogen steps. ### [Humidity Calculator](https://petguidecalc-web-dev.pages.dev/reptile/humidity-calculator/) Check habitat humidity against species targets for crested geckos, ball pythons, and leopard geckos, with a misting schedule. ### [Calcium Supplement Dosing Calculator](https://petguidecalc-web-dev.pages.dev/reptile/calcium-calculator/) Calcium and vitamin D3 dusting schedule based on diet, UVB lighting, and life stage, with the Ca:P ratio guidance behind it. ### [Egg Incubation Temperature & Sex Determination](https://petguidecalc-web-dev.pages.dev/reptile/incubation-temperature/) Check an incubation temperature against the attested 28–32°C range for bearded dragon eggs and read the temperature-dependent sex determination (TSD) evidence behind it. ### [Snake Prey Size Calculator](https://petguidecalc-web-dev.pages.dev/reptile/prey-size-calculator/) Size prey from body width or weight: 1–1.5× widest body width for corn snakes, 10–15% of body weight for ball pythons. ### [Feeding Frequency Calculator](https://petguidecalc-web-dev.pages.dev/reptile/feeding-calculator/) Feeding intervals by species and life stage for corn snakes and leopard geckos, including the overweight schedule. ### [Bearded Dragon Temperature Checker](https://petguidecalc-web-dev.pages.dev/reptile/bearded-dragon-temperature/) Check measured basking, cool-side, and night temperatures against published target bands with an OK, CAUTION, or RISK verdict per zone. ### [UVB Bulb Replacement Calculator](https://petguidecalc-web-dev.pages.dev/reptile/uvb-bulb-replacement/) When to replace a T5 HO or T8 UVB tube: 10–12 months for T5/HO and about 6 months for T8, with a countdown from your install date. ### [Snake Starter Guide](https://petguidecalc-web-dev.pages.dev/reptile/snake-care/) Enclosure size, temperature gradient, and humidity targets for ball pythons and corn snakes, compared side by side. ### [Aquarium Fish Compatibility Checker](https://petguidecalc-web-dev.pages.dev/aquarium/mix-calculator/) Compatibility verdicts with reasons for 12 common freshwater community fish, based on temperature and temperament rules. ### [Hamster Cage Size Calculator](https://petguidecalc-web-dev.pages.dev/hamster/cage-size-calculator/) Minimum and recommended floor areas for Syrian and dwarf hamsters, with cm/in conversion and shortfall guidance. ### [Crested and Leopard Gecko Humidity](https://petguidecalc-web-dev.pages.dev/reptile/gecko-humidity/) Deep-dive humidity check for crested and leopard geckos with RSPCA spray-to-peak rhythm and next-mist hint. ### [Snake Enclosure Size Calculator](https://petguidecalc-web-dev.pages.dev/reptile/enclosure-size-calculator/) Snake enclosure minimum floor (Swiss Mindestanforderungen) and ReptiFiles outline footprint from expected adult length. ### [Aquarium Water Change Schedule](https://petguidecalc-web-dev.pages.dev/aquarium/water-change-scheduler/) Water-change cadence and volume by load level: light 10%/2 weeks, standard 20%/2 weeks, heavy 30%/week (Co-Op + Instant Ocean). ### [Aquarium Salinity & Salt Mix](https://petguidecalc-web-dev.pages.dev/aquarium/salinity-calculator/) Instant Ocean salt grams from tank volume and target SG; built-in SG↔ppt conversion and a refractometer cross-check. ### [Hamster Bedding Depth Calculator](https://petguidecalc-web-dev.pages.dev/hamster/bedding-depth-calculator/) Bedding volume (L) and the RSPCA verdict (15 cm minimum, 20–25 cm for burrowing) for a hamster cage. ### [Rectangular Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/volume-calculator/) Water volume of a rectangular tank from length, width, and height in cm or inches, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Cube Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/cube-aquarium-volume-calculator/) Water volume of a cube aquarium from its side length, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Breeder Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/breeder-aquarium-volume-calculator/) Water volume of a low-profile breeder tank from length, width, and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Shallow Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/shallow-aquarium-volume-calculator/) Water volume of a shallow rectangular tank from length, width, and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Bow-Front Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/bow-front-aquarium-volume-calculator/) Water volume of a bow-front tank from length, flat depth, bow depth, and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Cylinder Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/cylinder-aquarium-volume-calculator/) Water volume of a cylindrical tank from radius and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Half-Cylinder Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/half-cylinder-aquarium-volume-calculator/) Water volume of a half-cylinder tank from radius and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Elliptical Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/elliptical-aquarium-volume-calculator/) Water volume of an elliptical tank from the semi-major and semi-minor axes and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Bullnose Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/bullnose-aquarium-volume-calculator/) Water volume of a bullnose tank from length, width, corner radius, and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Round-End Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/round-end-aquarium-volume-calculator/) Water volume of a round-end tank from length, width, and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Corner Bow-Front Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/corner-bow-front-aquarium-volume-calculator/) Water volume of a corner bow-front tank from length, flat depth, bow depth, and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Corner Cylinder Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/corner-cylinder-aquarium-volume-calculator/) Water volume of a corner cylinder tank from radius and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Corner Prism Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/corner-prism-aquarium-volume-calculator/) Water volume of a corner prism tank from the two wall legs and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Hexagon Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/hexagon-aquarium-volume-calculator/) Water volume of a hexagonal tank from side length and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Flat-Back Hexagon Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/flat-back-hexagon-aquarium-volume-calculator/) Water volume of a flat-back hexagon tank from front panel width, depth, and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Octagon Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/octagon-aquarium-volume-calculator/) Water volume of an octagonal tank from side length and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Pentagon Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/pentagon-aquarium-volume-calculator/) Water volume of a pentagonal tank from side length and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [L-Shaped Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/l-shaped-aquarium-volume-calculator/) Water volume of an L-shaped tank from the two section dimensions and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Trapezoid Aquarium Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/trapezoid-aquarium-volume-calculator/) Water volume of a trapezoid tank from front base, back base, depth, and height, with fill-height and substrate corrections and freshwater/saltwater weight. ### [Fish Bowl Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/fish-bowl-aquarium-volume-calculator/) Water volume of a spherical fish bowl from its diameter, with a welfare note on small bowls. ### [Aquarium Volume Unit Converter](https://petguidecalc-web-dev.pages.dev/aquarium/volume-unit-converter/) Convert aquarium volumes between US gallons, liters, UK gallons, cubic inches, cubic feet, and cubic centimeters with live results. ### [Aquarium Water Displacement Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/water-displacement-calculator/) Actual water volume after substrate, live rock, equipment, and air space, using labeled void-fraction defaults. ### [Aquarium Sump Volume Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/sump-volume-calculator/) Total system water volume from display tank, sump chamber, and refugium, with a hobby sump sizing table. ### [Aquarium Substrate Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/substrate-calculator/) Sand, gravel or aquasoil volume in liters and weight in kg/lb from tank length, width and substrate depth, with density presets. ### [Aquarium Heater Wattage Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/heater-wattage/) Starting heater wattage in W from tank size, temperature rise in °F, and room temperature, rounded to common 25–300 W heater steps. ### [Aquarium Filter Flow Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/filter-flow/) Recommended filter flow in GPH from tank volume, filter type, and freshwater vs saltwater, with a 70% head-loss note. ### [Aquarium Nitrogen Cycle Tracker](https://petguidecalc-web-dev.pages.dev/aquarium/nitrogen-cycle/) Verdict on ammonia, nitrite, and nitrate readings — UNSAFE, CYCLING, ESTABLISHED, or WATER-CHANGE-DUE — with the next step. ### [Aquarium Quarantine Duration Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/quarantine-duration/) Recommended quarantine window in days from tank temperature in °F and risk profile (standard, wild-caught, sick-tank history). ### [Aquarium Feeding Amount Calculator](https://petguidecalc-web-dev.pages.dev/aquarium/feeding-amount/) Per-feeding portion and meals per day from adult size class, life stage, and food type, with the 5-minute rule of thumb. ### [Hamster Wheel Size Calculator](https://petguidecalc-web-dev.pages.dev/hamster/wheel-size/) Minimum wheel diameter for Syrian and dwarf hamsters, with cm/in conversion and a bumblefoot-safe running surface reminder. ### [Rabbit Daily Hay Calculator](https://petguidecalc-web-dev.pages.dev/hamster/rabbit-hay/) Daily pellet allowance by body weight for dwarf, standard, and giant rabbits, alongside the 80% grass-hay rule. ### [Rabbit Body Condition Score Calculator](https://petguidecalc-web-dev.pages.dev/hamster/rabbit-bcs/) Score your rabbit on the veterinary 1–9 BCS scale (Hinkle et al.), combining palpation and visual assessment with an underweight / ideal / overweight verdict. ### [Guinea Pig Vitamin C Calculator](https://petguidecalc-web-dev.pages.dev/guinea-pigs/vitamin-c-calculator/) Daily vitamin C dose by life stage: ≥25 mg/d for healthy adults, 30–50 mg/d for juvenile, pregnant, or unwell guinea pigs, with food equivalents. ### [What Can Guinea Pigs Eat? Food Checker](https://petguidecalc-web-dev.pages.dev/guinea-pigs/what-can-guinea-pigs-eat/) Verdict photo wall of reviewed guinea pig foods: Safe, Limit, Avoid, or Toxic on every card, filterable by verdict and food category. ### [Budgie & Cockatiel Cage Size Calculator](https://petguidecalc-web-dev.pages.dev/bird/cage-size/) Minimum cage length, width, and bar spacing for budgies and cockatiels, with multi-bird scaling and a sandpaper-perch warning. ### [Chinchilla Cage Temperature Checker](https://petguidecalc-web-dev.pages.dev/hamster/chinchilla-checker/) Check room temperature (10–20 °C, never above 27 °C), humidity (< 50%), and cage floor area for one or two chinchillas. ### [Hedgehog Temperature Checker](https://petguidecalc-web-dev.pages.dev/hamster/hedgehog-temperature/) Check hedgehog room temperature (21–29 °C; never below 18 °C — hibernation attempt is fatal) and cage floor area (≥ 2 × 3 ft). ### [Red-Eared Slider Water Temperature Checker](https://petguidecalc-web-dev.pages.dev/aquarium/red-eared-slider-temperature/) Check water (24–29 °C), basking (24–31 °C), night (18–24 °C), water depth (1.5–2× shell), and minimum tank volume (10 gal/inch). ### [Pet Calorie Calculator (RER & MER)](https://petguidecalc-web-dev.pages.dev/tools/rer-calculator/) Resting and maintenance energy requirements (kcal/day) for dogs, cats, hamsters, rabbits, and hedgehogs across life stages, using the 70 × BW^0.75 WSAVA / NRC 2006 formula. ### [Pet Medication Dose Converter](https://petguidecalc-web-dev.pages.dev/tools/medication-dose/) Convert a veterinary dose rate (mg/kg) and body weight (kg/lb) into a single dose in mg and a liquid volume in mL, with common syringe tick hints. ### [Puppy & Kitten Vaccination & Deworming Schedule Builder](https://petguidecalc-web-dev.pages.dev/tools/vaccination-schedule/) Build a week-by-week puppy or kitten vaccination and deworming timeline from 2022 AAHA, 2020 AAFP, and CAPC guidelines — mark vaccines already given to suppress upcoming milestones. ## Industry signals Static snapshot from Sep 1, 2026; not live. 115 items · Snapshot: Sep 1, 2026 **How AI-curated scores work:** Scores are AI estimates of relevance to reptile, aquarium, and small-pet keepers. The top three are ranked by score only from English-language items. Each row links to its original source. Scores are not endorsements. Signal titles open the original source in a new tab. ### [Orphek’s Natura iCon MAX](https://reefbuilders.com/2026/08/30/orpheks-natura-icon-max/) **Relevance 75/100** · **Source:** Reef Builders · **Category:** Product ### [Natura iCon MAX](https://reefs.com/natura-icon-max/) **Relevance 72/100** · **Source:** Reefs.com · **Category:** Product ### [Years.com voluntarily recalls fresh meals](https://www.petfoodprocessing.net/articles/20815-yearscom-voluntarily-recalls-fresh-meals) **Relevance 62/100** · **Source:** PetfoodProcessing · **Category:** Risk [View all signals](https://petguidecalc-web-dev.pages.dev/intel/) ## Common questions **Q: What is PetGuideCalc?** PetGuideCalc is a collection of free calculators and short care guides for reptile, aquarium, bird, small-pet, dog, and cat keepers. Each tool states its assumptions, units, and sources so you can verify the math behind the result. **Q: Are the calculators really free?** Yes. No accounts, no paywalls, and no data collection beyond basic site analytics. The calculators exist to make evidence-based husbandry easier to apply. **Q: Where do the values come from?** Published husbandry standards and veterinary reference ranges, such as UVB exposure guides, enclosure size recommendations, and stocking rules. Every calculator links the sources it uses. **Q: Can I use these results instead of a veterinarian?** No. The calculators are educational planning tools, not medical advice. If you have health concerns about your pet, consult a qualified reptile or exotic-animal veterinarian. _PetGuideCalc — https://petguidecalc-web-dev.pages.dev_