Freshwater Aquarium Tools, Calculators, and Spreadsheets

The web is full of tools, calculators, and spreadsheets that can help you plan and maintain a healthy aquarium. However, it can take time to find ones that are trustworthy and/or easy to use. I've come across a number of these and I've listed my favourites below.

• EI and PPS-Pro Fertilizer Dosing Charts (Liquid and Dry) by Nilocg
• EI Dosing Calculator (Liquid and Dry) by AquariumCalculators.com
• Nutrient Accumulation Calculator by Rotala Butterfly
• Nutrient Dosing Calculator by Rotala Butterfly
• Hardness Units Converter by Lenn Tech
• Planted Tank Calculator (Downloadable Windows Software) by Zorfox