log₁₀(100) = 2, ln(100) = 4.60517019 and log₂(100) = 6.64385619.
log₁₀(100) = 2, ln(100) = 4.60517019 and log₂(100) = 6.64385619.
On most calculators, log means base 10 and ln means the natural logarithm (base e ≈ 2.71828). Here the base-10 log is a whole number because 100 = 102.
log₁₀(100) is the power you raise 10 to in order to get 100: 102 ≈ 100. Likewise e4.60517 ≈ 100.
For another base, use the change-of-base rule: logb(x) = log(x) ÷ log(b).
| log 100 | = 2 |
| ln 100 | = 4.60517 |
| log₂ 100 | = 6.643856 |
| 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(100) = 2, ln(100) = 4.60517019 and log₂(100) = 6.64385619.
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(100) = log(100) ÷ log(2) = 6.643856.
Yes. Use the calculator on this page, or open the full free Scientific Calculator with memory, history and keyboard support.