Example:
15 cal/s·cm² = 55.300359 Btu/s·ft²
1 cal/s·cm² = 3.686691 Btu/s·ft² | 1 Btu/s·ft² = 0.271246 cal/s·cm²
Conversion Steps:
15 × (41868.00000482 / 11356.526682221) = 55.300358784