วิธีการคำนวณ Logarithm Calculator
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A logarithm calculator computes log base 10, natural log (ln), log base 2, and any other base. Logarithms are the inverse of exponentiation.
สูตร
log_b(x) = y means b^y = x; Change of base: log_b(x) = log_10(x) / log_10(b)
- x
- Number
- b
- Base — Usually 10, e, or 2
- y
- Logarithm result
คำแนะนำทีละขั้นตอน
- 1logₐ(x) = y means aʸ = x
- 2log₁₀(x): common logarithm
- 3ln(x): natural log, base e ≈ 2.71828
- 4Change of base: logₐ(x) = ln(x)/ln(a)
ตัวอย่างที่มีคำตอบ
อินพุต
log₁₀(1000)
ผลลัพธ์
3 (because 10³ = 1000)
อินพุต
ln(e²)
ผลลัพธ์
2
คำถามที่พบบ่อย
What's the difference between log, ln, and log₁₀?
log (no base) = log₁₀. ln = natural log (base e ≈ 2.718). log₂ = binary logarithm.
When do I use logarithms?
Solving exponential equations, measuring scales (pH, Richter, decibels), growth/decay rates.
Why is log₁₀ of 1000 equal to 3?
10³ = 1000, so log₁₀(1000) = 3. Logarithm is the inverse of exponentiation.