In the NFPA standard 13-2016, the table lists different storage levels in meters:
| Table 16.3.3.1 | Table 17.3.3.1 |
Maximum storage height | 40 ft = 12 m | 40 ft = 12 m |
Maximum roof height | 45 ft = 13.7 m | 45 ft = 14 m ??? |
Diference is 1 ft = 0.3048 m.
Which measure is correct?
I personally would choose 13.7 m as it is technically the most precise.
The 2019 edition of NFPA 13 will correct many of the conversion errors found on current edition. There are talks of printing a metric edition of NFPA 13.