Calculate grammage, burst value, or burst strength from any two inputs with units in g/m², oz/yd², kPa, or psi, and show steps.
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Burst Value Formula
The burst value calculator uses grammage, burst value, and burst strength. Burst value is also commonly called burst index.
- BV = burst value or burst index, usually in kPa·m²/g
- BS = burst strength, usually in kPa
- G = grammage, usually in g/m²
The same relationship can be rearranged depending on which value you need to calculate:
- To calculate burst value: enter grammage and burst strength. The calculator divides burst strength by grammage.
- To calculate burst strength: enter grammage and burst value. The calculator multiplies grammage by burst value.
- To calculate grammage: enter burst strength and burst value. The calculator divides burst strength by burst value.
The calculator converts all inputs to base units before calculating: grammage to g/m², burst strength to kPa, and burst value to kPa·m²/g. It then converts the result to the selected result unit. Choose what to solve for; only the two required measurements are shown.
Burst Value Unit Conversions
Use these conversions to check results when switching between metric and imperial units.
| Measurement | Conversion | Used by the calculator |
|---|---|---|
| Grammage | 1 oz/yd² ≈ 33.90574747 g/m² | Converts sheet basis weight to metric grammage |
| Burst strength | 1 psi ≈ 6.89475729 kPa | Converts pressure to kPa |
| Burst value | 1 psi/(oz/yd²) ≈ 0.20335069 kPa·m²/g | Converts burst index to metric units |
Common Burst Value Inputs
| Input | What it represents | Typical unit |
|---|---|---|
| Grammage | Mass of paper, board, or sheet material per unit area | g/m² or oz/yd² |
| Burst strength | Pressure required to rupture the sheet during a burst test | kPa or psi |
| Burst value | Burst strength normalized by grammage | kPa·m²/g or psi/(oz/yd²) |
Burst Value Examples
Example 1: Calculate burst value
You have a sheet with a grammage of 120 g/m² and a burst strength of 360 kPa.
The burst value is 3.0000 kPa·m²/g.
Example 2: Calculate burst strength
You have a grammage of 150 g/m² and a burst value of 2.8 kPa·m²/g.
The burst strength is 420 kPa.
Burst Value FAQ
Is burst value the same as burst index?
Yes. In this calculator, burst value and burst index mean the same thing. Both describe burst strength divided by grammage. The common metric unit is kPa·m²/g.
Why does grammage affect burst value?
Grammage is the mass per unit area of the sheet. Burst value normalizes burst strength by grammage, so two sheets with different basis weights can be compared more fairly. A heavier sheet may have a higher burst strength simply because it contains more material, but burst value adjusts for that weight difference.
Why do I need to enter exactly two values?
Choose the value to calculate and enter the two measurements shown. Grammage must be positive. A zero index cannot determine grammage: zero pressure then permits multiple grammages, while positive pressure conflicts with a zero index. This arithmetic does not certify a material or replace a burst test.
