# Small Pet Calculators

> Free small-pet calculators for hamsters, rabbits, guinea pigs, chinchillas, and hedgehogs: cage, wheel, bedding, hay, BCS, vitamin C, temperature.

- [Browse all 9 small-pet tools](#tools)
- [Browse all pet care tools](/tools/)
- [About](/about/)
- [Sources](/sources/)

## All small-pet tools

- **[Hamster Cage Size Calculator](https://petguidecalc.com/hamster/cage-size-calculator/)** — Minimum and recommended floor areas for Syrian and dwarf hamsters, with cm/in conversion and shortfall guidance. _(Reviewed 2026-08)_
- **[Hamster Bedding Depth Calculator](https://petguidecalc.com/hamster/bedding-depth-calculator/)** — Bedding volume (L) and the RSPCA verdict (15 cm minimum, 20–25 cm for burrowing) for a hamster cage. _(Reviewed 2026-09)_
- **[Hamster Wheel Size Calculator](https://petguidecalc.com/hamster/wheel-size/)** — Minimum wheel diameter for Syrian and dwarf hamsters, with cm/in conversion and a bumblefoot-safe running surface reminder. _(Reviewed 2026-09)_
- **[Rabbit Daily Hay Calculator](https://petguidecalc.com/hamster/rabbit-hay/)** — Daily pellet allowance by body weight for dwarf, standard, and giant rabbits, alongside the 80% grass-hay rule. _(Reviewed 2026-09)_
- **[Rabbit Body Condition Score Calculator](https://petguidecalc.com/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. _(Reviewed 2026-09)_
- **[Guinea Pig Vitamin C Calculator](https://petguidecalc.com/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. _(Reviewed 2026-09)_
- **[What Can Guinea Pigs Eat? Food Checker](https://petguidecalc.com/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. _(Reviewed 2026-09)_
- **[Chinchilla Cage Temperature Checker](https://petguidecalc.com/hamster/chinchilla-checker/)** — Check room temperature (10–20 °C, never above 27 °C), humidity (< 50%), and cage floor area for one or two chinchillas. _(Reviewed 2026-09)_
- **[Hedgehog Temperature Checker](https://petguidecalc.com/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). _(Reviewed 2026-09)_

## How the numbers work

Small-pet calculations draw on welfare-organization standards rather than peer-reviewed literature: RSPCA, TVT, German BMEL, House Rabbit Society, and PDSA. Each tool names its source inline on its own page; the complete enumeration is on [/sources/](/sources/), and methodology (how accuracy and review cadence are handled) is on [/methodology/](/methodology/).

## Small-pet calculator questions

### Why does the URL say /hamster/ when the page covers more species?

Each species tool lives at /hamster/<species>/ — for example, /hamster/rabbit-hay/ for the rabbit hay calculator and /hamster/chinchilla-checker/ for the chinchilla temperature checker. Renaming the URL would break external links and the sitemap. The category name internally is "Small pets".

### Which standard backs the hamster cage size minimum?

The RSPCA hamster welfare guide: Syrian hamsters need at least 80 × 50 cm of unbroken floor area, with 15 cm minimum bedding depth (20–25 cm recommended for burrowing behavior). Dwarf hamsters need smaller but proportionally enriched space — the cage size calculator flags your species-specific minimum.

### Why does my rabbit need 80% grass hay in the diet?

The 80% figure is the veterinary consensus for adult rabbit dental and gut health: grass hay provides the long fiber that wears continuously-growing teeth and keeps the hindgut fermentation moving. Pellets and fresh greens fill the remaining 20%. The rabbit hay calculator returns a daily pellet allowance by body weight and the hay-to-pellet ratio.

### How much vitamin C does a guinea pig actually need?

Healthy adult guinea pigs need ≥25 mg/day of vitamin C from food or supplementation. Juveniles, pregnant, or unwell guinea pigs need 30–50 mg/day. The calculator translates your guinea pig's weight and life stage into an mg target and lists the fresh foods that hit it (bell pepper, kale, parsley).

### How cold is too cold for a chinchilla?

Chinchillas must stay between 10–20 °C — never above 27 °C, where heat stroke becomes likely. The chinchilla temperature checker reads your room temperature and humidity (must stay below 50%) against welfare standards. The same tool also checks cage floor area against the minimum for the species.