Cheatsheet for approximations of powers of two. See also Powers Of Ten.
Time
Numbers of seconds approximated to “human” times (±20%).
| Seconds | Decimal | Roughly | Actual |
|---|---|---|---|
| 2⁸ | 256 | 4 minutes | 4m16s |
| 2¹⁰ | 1,024 | 15 minutes | 17m4s |
| 2¹² | 4,096 | 1 hour | 1h8m16s |
| 2¹⁴ | 16,384 | 4 hours | 4h33m4s |
| 2¹⁶ | 65,536 | 18 hours | 18h12m16s |
| 2¹⁸ | 262,144 | 3 days | 3d0h49m4s |
| 2²⁰ | 1.048×10⁶ | 2 weeks | 12d3h16m16s |
| 2²⁴ | 16.777×10⁶ | 6 months | 194d4h20m16s |
| 2²⁸ | 268.435×10⁶ | 10 years | ~8y185d |
| 2³² | 4.294×10⁹ | 150 years | ~136y36d |
| 2⁴⁰ | 1,099×10⁹ | 35,000 years | ~34841y |
| 2⁴⁸ | 281.474×10¹² | 9 million years | ~8919404y |
Data Size
Base 2 given to 3 significant figures.
| Bytes | Base 2 | Base 10 |
|---|---|---|
| 2¹⁰ | 1KiB | 1024B |
| 2¹² | 4KiB | 4096B |
| 2¹⁴ | 16KiB | 16.38KB |
| 2¹⁶ | 64KiB | 65.54KB |
| 2¹⁸ | 256KiB | 262.1KB |
| 2²⁰ | 1MiB | 1.049MB |
| 2²² | 4MiB | 4.194MB |
| 2²⁴ | 16MiB | 16.78MB |
| 2²⁶ | 64MiB | 67.11MB |
| 2²⁸ | 256MiB | 268.4MB |
| 2³⁰ | 1GiB | 1.074GB |
| 2³² | 4GiB | 4.295GB |
| 2³⁴ | 16GiB | 17.18GB |
| 2³⁶ | 64GiB | 68.72GB |
| 2³⁸ | 256GiB | 274.9GB |
| 2⁴⁰ | 1TiB | 1.1GB |