Table for determining transition level[citation needed] QNH (in hectopascals) Transition altitude (in feet) 3,000 4,000 5,000 6,000 18,000 1032–1050 FL025 FL035 FL045 FL055 FL175 1014–1031 FL030 FL040 FL050 FL060 FL180 996–1013 FL035 FL045 FL055 FL065 FL185 978–995 FL040 FL050 FL060 FL070 FL190 960–977 FL045 FL055 FL065 FL075 FL195 943–959 FL050 FL060 FL070 FL080 FL200