Scientific Calculator
Scientific · Unit Converter · Formulas · Base · Statistics
Scientific Calculator
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Quadratic Equation (ax² + bx + c = 0)
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Pythagorean Theorem (a² + b² = c²)
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Permutation (nPr) & Combination (nCr)
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GCD & LCM
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FAQ
What is the difference between DEG and RAD?
DEG (degrees) divides a full circle into 360, while RAD (radians) uses 2π. sin(90°) = sin(π/2 rad) = 1. Use DEG for everyday math and RAD for engineering or programming.
How do I convert pyeong to square meters?
1 pyeong = 3.3058 ㎡. For example, a 24-pyeong apartment = 24 × 3.3058 ≈ 79.34 ㎡. An '84㎡ exclusive area' corresponds to about 25.4 pyeong.
Where is base conversion used?
Binary is used inside computers, octal for Unix file permissions (chmod 755), hexadecimal for color codes (#FF0000) and memory addresses. Essential for programmers and CS students.
What is the difference between mean and median?
Mean is the sum of all values ÷ count; median is the middle value when sorted. Example: [1, 2, 3, 4, 100] — mean is 22, median is 3. Median is less affected by outliers.
What is the difference between permutation (nPr) and combination (nCr)?
Permutation is used when order matters (1st, 2nd, 3rd place); combination when order does not matter (selecting 3 members). For 5 people choose 3: permutation = 60, combination = 10.
What is the difference between log and ln?
log (common logarithm) has base 10; ln (natural logarithm) has base e (≈2.718). log(100) = 2, ln(e) = 1. ln is common in science/engineering; log is used in everyday calculations.
How do I interpret standard deviation?
Standard deviation measures how spread out data is from the mean. A small value means data is clustered near the mean; a large value means it is spread out. In a normal distribution, about 68% of data falls within ±1 standard deviation of the mean.