Quick guide
How to use this calculator
- Choose the calculation mode or measurement system that matches the values you actually have.
- Enter measured project dimensions and use product-specific coverage, density, yield, resistance, or waste data where requested.
- Review the intermediate results before ordering material or applying the result on site.
Calculation method
Calculation method
Expansion volume = system volume × expansion%; convert gauge pressures to absolute with the entered local atmosphere; ideal tank volume = expansion volume ÷ [1 − absolute precharge pressure ÷ absolute maximum pressure].
The calculator preserves full internal precision and rounds only displayed results. Quantity outputs round up when whole purchasable pieces are required.
Worked example
Worked example
A 190 L system expanding 1.5% between 380 and 550 kPa gauge at 101.325 kPa atmosphere needs about 10.9 L idealized tank volume.
Expansion volume = system volume × expansion%; convert gauge pressures to absolute with the entered local atmosphere; ideal tank volume = expansion volume ÷ [1 − absolute precharge pressure ÷ absolute maximum pressure].
Supported inputs
Precision and limits
Water-property assumptions
Where a calculator does not request fluid properties, it models water at 998.2 kg/m³ density and 4,186 J/(kg·K) specific heat. Temperature, pressure, dissolved content, or a different fluid can change real results.
Planning scope
This calculator supports measurement, estimating, and scenario planning. It does not inspect a site, select a product, certify a design, or replace drawings, specifications, manufacturer instructions, local codes, permits, or a qualified trade professional.
Measured and product-specific inputs
Nominal dimensions can differ from actual dimensions. Verify inside pipe diameters, actual lumber sizes, product coverage, bag yield, material density, conductor resistance, waste, and packaging against the materials used on the project.
Safety and regulatory limits
Electrical, HVAC, structural, excavation, roofing, pressure, lifting, and life-safety work may require jurisdiction-specific calculations and professional approval. Do not use a generic planning result as a code-compliance or safety determination.
Precision and privacy
Inputs accept bounded plain decimals. Calculations remain in this browser and raw entered project values are not submitted to 365CALCS.COM.
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