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Dog Food Portion Calculator (Calories & Cups)

Daily calories and cups / grams of food for your dog by weight, age, activity and food brand.

Aquarium Fish Stocking Calculator

Tank volume from dimensions plus realistic fish stocking guidance — better than "1 inch per gallon".

Aquarium Water Parameter Converter

Convert aquarium water parameters — ppm, dGH, dKH, °C / °F and meq/L — with species presets.