To quickly estimate Celsius to Fahrenheit in your head, double the Celsius temperature and add 30.

To convert Fahrenheit to Celsius, subtract 30 and divide by 2.

Examples:

• 20°C × 2 = 40, plus 30 = roughly 70°F (actual: 68°F)
• 80°F - 30 = 50, divided by 2 = roughly 25°C (actual: 26.7°C)
• 0°C × 2 = 0, plus 30 = roughly 30°F (actual: 32°F)
• 100°F - 30 = 70, divided by 2 = roughly 35°C (actual: 37.8°C)
• 30°C × 2 = 60, plus 30 = roughly 90°F (actual: 86°F)
• 50°F - 30 = 20, divided by 2 = roughly 10°C (actual: 10°C)

Computer storage units can be confusing, so here's a quick rundown:

-bits (e.g., megabits, gigabits)

• represented by kb, Mb, Gb, Tb, Pb, etc.
• mostly used for network bandwidth (e.g., Mbps) and bitrate (like audio and video files)

-bytes (e.g., megabytes, gigabytes)

• represented by kB, MB, GB, TB, PB, etc.
• used by manufacturers to quantify hard drive sizes
• also used for network transfers (e.g., MB/s) and by macOS

-bibytes (e.g., mebibytes, gibibytes)

• represented by KiB, MiB, GiB, TiB, PiB, etc.
• used by RAM manufacturers for memory sizes and by Windows and Linux for disk and file sizes, though often misleadingly abbreviated as MB, GB, etc.