Logarithm & Exponential Base-Power Solver (b^x = y)
Logarithms and exponentials are exact inverse operations: raising base b to exponent x produces argument y (y = b^x), while the base-b logarithm recovers the exponent x = ln(y) / ln(b).
Power to which base b must be raised to yield y
Logarithm/exponential base (2 = binary, 2.71828 = e, 10 = common)
Exponential output value y = b^x
Step-by-Step Calculation
Logarithms and exponentials are exact inverse operations: raising base b to exponent x produces argument y (y = b^x), while the base-b logarithm recovers the exponent x = ln(y) / ln(b).
Real-World Reference Values
2¹⁰ = 1,024 states (Shannon entropy base)
Continuous growth and calculus base
Orders-of-magnitude scientific scale
20-Row Comparison Table
Logarithm / Exponent (log_b y) (x) · Base (b)
| # | Base (b) | Logarithm / Exponent (log_b y) (x) | Δ % |
|---|---|---|---|
| 01 | 2 Current | 10 | 0.00% |
| 02 | 7.3515 | 3.4746 | -65.25% |
| 03 | 14.693 | 2.5793 | -74.21% |
| 04 | 22.0345 | 2.2413 | -77.59% |
| 05 | 29.376 | 2.0506 | -79.49% |
| 06 | 36.7175 | 1.9237 | -80.76% |
| 07 | 44.059 | 1.831 | -81.69% |
| 08 | 51.4005 | 1.7594 | -82.41% |
| 09 | 58.7421 | 1.7017 | -82.98% |
| 10 | 66.0836 | 1.6539 | -83.46% |
| 11 | 73.4251 | 1.6134 | -83.87% |
| 12 | 80.7666 | 1.5784 | -84.22% |
| 13 | 88.1081 | 1.5477 | -84.52% |
| 14 | 95.4496 | 1.5205 | -84.79% |
| 15 | 102.7911 | 1.4962 | -85.04% |
| 16 | 110.1326 | 1.4743 | -85.26% |
| 17 | 117.4741 | 1.4543 | -85.46% |
| 18 | 124.8156 | 1.436 | -85.64% |
| 19 | 132.1571 | 1.4192 | -85.81% |
| 20 | 139.4986 | 1.4037 | -85.96% |
Frequently Asked Questions
How does the Change of Base formula work?+
Any base-b logarithm can be evaluated using natural logarithms via log_b(y) = ln(y) / ln(b).
How do I solve for the base b when x and y are known?+
Click SOLVE FOR on b (Base) to raise y to the reciprocal power 1/x: b = y^(1/x).
Why must argument y be strictly positive?+
For any positive real base b > 0, b^x is strictly positive for all real x, so real logarithms of zero or negative numbers are undefined.