log₁₀(20) = 1.30103, ln(20) = 2.99573227 and log₂(20) = 4.32192809.
log₁₀(20) = 1.30103, ln(20) = 2.99573227 and log₂(20) = 4.32192809.
On most calculators, log means base 10 and ln means the natural logarithm (base e ≈ 2.71828).
log₁₀(20) is the power you raise 10 to in order to get 20: 101.30103 ≈ 20. Likewise e2.995732 ≈ 20.
For another base, use the change-of-base rule: logb(x) = log(x) ÷ log(b).
| log 20 | = 1.30103 |
| ln 20 | = 2.995732 |
| log₂ 20 | = 4.321928 |
| Number | log₁₀ | ln |
|---|---|---|
| 2 | 0.30103 | 0.693147 |
| 3 | 0.477121 | 1.098612 |
| 5 | 0.69897 | 1.609438 |
| 10 | 1 | 2.302585 |
| 20 | 1.30103 | 2.995732 |
| 50 | 1.69897 | 3.912023 |
| 100 | 2 | 4.60517 |
| 200 | 2.30103 | 5.298317 |
| 500 | 2.69897 | 6.214608 |
| 1,000 | 3 | 6.907755 |
| 10,000 | 4 | 9.21034 |
log₁₀(20) = 1.30103, ln(20) = 2.99573227 and log₂(20) = 4.32192809.
log normally means base 10, while ln is the natural logarithm with base e (about 2.71828).
Use log(x) ÷ log(base). For example log₂(20) = log(20) ÷ log(2) = 4.321928.
Yes. Use the calculator on this page, or open the full free Scientific Calculator with memory, history and keyboard support.