1.5

1.5 (one and one half, three halves, or sesquialterum) may refer to:


 * 1.5 °C is the preferred limit of global warming signed in the Paris Agreement
 * 1.5, an album by Big Data
 * Superparticular ratio: 3/2 or 1$1/2$
 * Perfect fifth (3/2), a musical interval
 * "1.5" (song), a 2018 song by 21 Savage