# 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 - **42 tools** - **8 industry feeds tracked** — [/intel/](https://petguidecalc-web-dev.pages.dev/intel/) - **21 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. ## How sources are graded Every number on this site traces back to a cited source, and every cited source carries a letter grade. The scale runs from S, the references veterinarians themselves use, down to D, the community content we never cite. When a tool carries an evidence grade, this is the scale behind the letter. - **S · Veterinary manuals & formularies** — The professional references veterinarians themselves use — the strongest evidence tier on this site. Examples: Merck Veterinary Manual. - **A · Peer-reviewed research & university clinics** — Peer-reviewed studies and clinical guidance from university veterinary hospitals. Examples: PubMed-indexed studies · university veterinary hospitals. - **B · Welfare & professional organizations** — National welfare bodies and professional practices that publish editorially reviewed care standards. Examples: RSPCA · VCA Animal Hospitals · PDSA · Blue Cross · SPCA. - **C · Practitioner & industry education** — Educational material from veterinary practices and industry — used for side context, never on its own to decide a number. Examples: Practice blogs · university outreach material · feed-company care sheets. - **D · Community content — never cited** — Forums, wikis, and personal blogs. This table is the only place the letter appears on the site. Examples: None — nothing from this tier is ever cited. ### When credible sources disagree - **No conflict** — The sources state the same thing. - **Sources differ in scope** — Each source gives its formula or range for the situation it covers, so the positions sit side by side rather than contradicting each other. - **Guidelines genuinely disagree** — Credible guidelines reach different conclusions on the same question. This site picks the side with the stronger evidence, says so on the page, and quotes both positions. **How disagreements are settled:** Positions are never averaged into a middle value. The higher-graded source decides, both sides stay quoted so you can check them yourself, and every number behind a tool traces back to a graded source. [Full methodology](https://petguidecalc-web-dev.pages.dev/methodology/) · [How evidence is labeled](https://petguidecalc-web-dev.pages.dev/about/#how-evidence-works) · [Every cited source](https://petguidecalc-web-dev.pages.dev/sources/) · [Browse all tools](https://petguidecalc-web-dev.pages.dev/tools/) ## Tools PetGuideCalc organizes 41 evidence-based calculators and guides into five pet domains. Browse the complete catalog with domain, care-job, and search filters at [/tools/](https://petguidecalc-web-dev.pages.dev/tools/). - [Dogs & Cats](https://petguidecalc-web-dev.pages.dev/tools/?category=Others) — Calorie needs, dosing, and preventive schedules (3 tools) - [Reptiles](https://petguidecalc-web-dev.pages.dev/reptile/) — Lighting, heating, humidity, feeding, and incubation (12 tools) - [Aquariums](https://petguidecalc-web-dev.pages.dev/aquarium/) — Tank sizing, water quality, filtration, and fish care (14 tools) - [Small pets](https://petguidecalc-web-dev.pages.dev/hamster/) — Housing, nutrition, and condition checks (11 tools) - [Birds](https://petguidecalc-web-dev.pages.dev/bird/) — Evidence-based housing guidance (1 tools) ### Start with these - [UVB Calculator](https://petguidecalc-web-dev.pages.dev/reptile/uvb-calculator/) — Reptiles · Environment & equipment - [Fish Compatibility](https://petguidecalc-web-dev.pages.dev/aquarium/mix-calculator/) — Aquariums · Health & schedules - [Hamster Cage Size](https://petguidecalc-web-dev.pages.dev/hamster/cage-size-calculator/) — Small pets · Habitat & sizing - [Guinea Pig Food Checker](https://petguidecalc-web-dev.pages.dev/guinea-pigs/what-can-guinea-pigs-eat/) — Small pets · Feeding & nutrition - [Bird Cage Size](https://petguidecalc-web-dev.pages.dev/bird/cage-size/) — Birds · Habitat & sizing - [Calorie Calculator](https://petguidecalc-web-dev.pages.dev/tools/rer-calculator/) — Dogs & Cats · Feeding & nutrition ## 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_