=EverydayCalc.org

Calculator collection

Aquarium Care Calculators

Use these calculators for aquarium gallons, heaters, water changes, filter flow, substrate, salt, medication, conditioner, cycling ammonia, CO2, and tank weight.

Last reviewed: May 2026

How to use this collection

Start with actual water volume because substrate, decor, and waterline height affect nearly every aquarium estimate. Then use related tools for equipment, dosing, and maintenance.

Buying guidance

For aquarium products, compare the calculator result with product labels, livestock needs, and tank conditions. Dose conservatively when fish, shrimp, plants, or invertebrates may be sensitive.

What to check next

Use related calculators to cross-check material quantities, equipment size, operating cost, and practical buffers before buying products or starting a project.

Tools

Aquarium calculators

Tank care calculators for gallons, heaters, and water changes.

Aquarium Aquarium Volume Calculator Calculate aquarium volume in gallons and liters from rectangular tank dimensions in inches. Aquarium Aquarium Heater Size Calculator Estimate aquarium heater wattage from tank size, room temperature, and target water temperature. Aquarium Aquarium Water Change Calculator Calculate how many gallons of aquarium water to remove and replace for a chosen water change percentage. Aquarium Aquarium Stocking Estimate Calculator Estimate a conservative freshwater stocking range from aquarium gallons and stocking style. Aquarium Aquarium Filter Flow Calculator Estimate aquarium filter flow rate in GPH from tank volume and desired turnover per hour. Aquarium Aquarium Substrate Calculator Estimate aquarium substrate pounds from tank footprint, substrate depth, and material density. Aquarium Aquarium Salt Dosage Calculator Estimate aquarium salt dosage from tank gallons and teaspoons per gallon for measured freshwater treatment planning. Aquarium Aquarium Medication Dosage Calculator Estimate aquarium medication dose from water volume and label dose per 10 gallons. Aquarium Aquarium CO2 Calculator Estimate dissolved CO2 from KH and pH for planted aquarium planning, injection checks, and rough livestock safety review. Aquarium Aquarium Water Conditioner Dosage Calculator Calculate dechlorinator or water conditioner dose from replacement water gallons and label dose. Aquarium Aquarium Cycle Ammonia Calculator Estimate ammonia dose for fishless cycling from tank gallons, target ppm, and product strength. Aquarium Aquarium Weight Calculator Estimate filled aquarium weight from gallons, empty tank weight, substrate, and decor. Aquarium Aquarium Stand Weight Calculator Estimate recommended stand capacity from filled aquarium weight and a safety factor.

Guides

Aquarium supporting guides

Long-tail pages help explain calculator results and give visitors useful buying context.

Aquarium Aquarium Water Change Schedule Guide Plan aquarium water changes by tank size, stocking level, and change percentage. Aquarium How Many Gallons Is My Fish Tank? Calculate aquarium gallons from tank length, width, height, and displacement from substrate or decor. Aquarium What Size Heater Do I Need for My Aquarium? Choose aquarium heater wattage from tank gallons, room temperature, target water temperature, and safety margin. Aquarium How Much Gravel or Substrate Does an Aquarium Need? Estimate aquarium gravel, sand, or planted substrate depth and pounds from tank footprint. Aquarium Best Aquarium Heaters by Tank Size Use tank gallons and temperature rise to understand aquarium heater wattage ranges before comparing heaters. Aquarium Best Aquarium Filters for 20, 40, and 75 Gallon Tanks Compare filter flow, media space, and turnover targets for common 20, 40, and 75 gallon aquariums. Aquarium Canister Filter vs. Hang-on-Back Filter Compare canister and hang-on-back aquarium filters by flow, media space, maintenance, and tank size. Aquarium Glass Aquarium vs. Acrylic Aquarium Compare glass and acrylic aquariums by weight, scratch resistance, clarity, cost, and support needs. Aquarium What Size Heater for a 20 Gallon Aquarium? Estimate aquarium heater wattage for a 20 gallon tank based on room temperature and target water temperature. Aquarium What Size Heater for a 75 Gallon Aquarium? Estimate heater wattage for a 75 gallon aquarium and understand when two heaters may be better than one. Aquarium What Size Aquarium Heater for a 75 Gallon Tank? Estimate heater wattage for a 75 gallon aquarium and decide whether one heater or two smaller heaters makes more sense. Aquarium Aquarium Heater Size for 10 Gallon Tank. Estimate heater wattage for a 10 gallon aquarium based on temperature rise, room temperature, and practical heater placement.

Charts

Aquarium charts

Use these chart pages for quick references, printable visuals, and image-search-friendly planning aids.

Aquarium chart Aquarium Heater Size Chart Use this aquarium heater wattage chart to compare tank gallons and common heater sizes.

Recently updated

Recently updated calculators

These calculators are good candidates for seasonal review before demand peaks.

Aquarium Aquarium Volume Calculator Calculate aquarium volume in gallons and liters from rectangular tank dimensions in inches. Aquarium Aquarium Heater Size Calculator Estimate aquarium heater wattage from tank size, room temperature, and target water temperature. Aquarium Aquarium Water Change Calculator Calculate how many gallons of aquarium water to remove and replace for a chosen water change percentage. Aquarium Aquarium Stocking Estimate Calculator Estimate a conservative freshwater stocking range from aquarium gallons and stocking style. Aquarium Aquarium Filter Flow Calculator Estimate aquarium filter flow rate in GPH from tank volume and desired turnover per hour. Aquarium Aquarium Substrate Calculator Estimate aquarium substrate pounds from tank footprint, substrate depth, and material density.