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Summary :

Aquarium volume and weight calculator Temperature conversion (°C, °F, K) Water hardness conversion (GH/TH, KH/TAC) Water mixing volume calculator Aquarium heater wattage calculator Electricity consumption cost calculator Aquarium glass thickness calculator

Aquarium Volume and Weight Calculator

Enter the length, width, and height to calculate the gross volume. Specify the glass thickness to compute the internal volume and estimated empty weight of the aquarium. Calculations use a density of 2.53 for standard soda-lime glass, excluding the weight of braces, center struts, rim frames, or glass lids.

Length: cm	x Width: cm	x Height: cm
The gross volume is: liters.
Glass thickness: mm	The internal volume is: liters
Empty weight: kg	1 cm of tank height equals: liters
The actual net water volume is: liters (estimated). 10 cm of internal height is deducted (accounting for 5–6 cm of substrate and 4–5 cm of headspace at the top) for this calculation.

Standard conventions for stating aquarium dimensions follow L x W x H (Length x Width x Height).

Temperature Conversion (°C, °F, K)

As a quick reference, 25 °C equals 77 °F, and 81 °F is approximately 27.2 °C.

°Fahrenheit

(t°-32)*5/9

°Celsius

or Kelvin

Water Hardness Conversion (GH/TH, KH/TAC)

The conversion factors below are rounded to the 4^th decimal place. In practice, 2 digits—or even a single digit—are more than enough. Drop-based colorimetric test kits measure water GH hardness.

ppm CaCO3 = US measurement (10 ppm CaCO3 = 1°f) °clarks = UK Clark degree °all = German degree (°dGH and °dKH) °f = French degree (for TH and TAC) For reference : 1°f = 0,2 mEq/l
°all	1.7848	°f
ppm	0.05603	°all
ppm	0.0715	°clarks
ppm	0.1	°f

Definitions : 1°f = 10 mg/l CaCO₃ and 1°all = 10 mg/l CaO.

Atomic weight reference for the elements:

Calcium [Ca] = 40.078, Oxygen [O] = 15.9994, and Carbon [C] = 12.0107: consequently, the molecular weight of CaO = 56.0774 g/mol and CaCO₃ = 100.0869 g/mol. This yields the conversion factors used above (56.0774 / 100.0869 = 0.5603, or its inverse 100.0869 / 56.0774 = 1.7848).

Water Mixing Volume Calculator

Enter the initial value (typically a measured parameter of your aquarium water), the mixing water value, and the target final value. Finally, enter the total water volume of the aquarium: the calculator will determine the exact volumes of both water sources needed to achieve the target value.

Initial value:Unit	Mixing value:Unit	Target final value:Unit
Total volume:liters of water
You need to mix liters of the initial water and liters of the mixing water.

This works for many freshwater and saltwater parameters, such as KH, GH, pH, temperature, salinity/density, etc.

Aquarium Heater Wattage Calculator

Enter your aquarium dimensions (L x W x H) and the 2 required temperatures: the ambient room temperature must be at least 10 °C and lower than the target aquarium water temperature.

Length:cm	* Width:cm	* Height:cm
Room temperature: °C >and aquarium water temperature: °C
The recommended heater wattage is: Watts (in 25 W increments)

Temperature values cannot exceed 35 °C.

Electricity Consumption Cost Calculator

Enter your equipment wattage in Watts and the requested operating schedule.
HP = Peak Hours, HC = Off-Peak Hours.
Preset French residential tariffs assume 8 off-peak hours per day (22:00 to 06:00). Select "Custom" to enter your own local electricity rate.

Equipment wattage: Watts (1 kW = 1000 W)
If the device runs 24/7, check this box , otherwise enter daily hours on the right.	Peak hours (HP): hours Off-peak hours (HC): hours
Select your tariff plan: Flat Rate Peak / Off-Peak Tempo Outside France (or to use your own rate), select Custom, and enter your kWh rates on the right.	Rates can only be edited when the "Custom" option is selected. Peak rate: / kWh Off-peak rate: / kWh
Estimated average monthly cost: ~ / month

For a more accurate estimate, consult your electricity provider to perform an energy audit for your setup. This calculation is an estimate only.

Aquarium Glass Thickness Calculator

Enter the longest pane length (30 to 400 cm) and aquarium height in cm (30 to 100 cm). A standard commercial glass thickness (4 to 19 mm) will be recommended according to the specifications below, alongside the exact calculated value. You may safely reduce the height by 5 cm if top bracing strips are installed.

Tank length: cm	Front height: cm	Calculated thickness: mm
Recommended commercial glass thickness: mm		Safety factor:

WARNING: This calculation applies to standard aquarium dimensions (under 1,200 liters) assuming the glass panes are supported on all 4 sides (i.e., with top bracing)! Thickness values follow Saint-Gobain™ manufacturer specifications. The glazing used is annealed soda-lime glass with a tensile stress rating of 6 N/mm² and a safety factor of 3.5 (meaning the tank can withstand a water column 3.5 times higher). The actual safety factor is recalculated at the end.

Aquarium height	Glass thickness
< 35 cm	5 mm
< 45 cm	6 mm
< 55 cm	8 mm
< 65 cm	10 mm
< 75 cm	12 mm
< 85 cm	15 mm

Alongside the calculated thickness above, the empirical values in this table are commonly used for smaller aquariums built with top braces, center struts, and reinforcements (4-edge support).
The author and the website hosting this aquarium calculator module disclaim all liability for any application of the formulas and tables above. Always verify with a qualified professional beforehand.