Enter any exponent and the Power of 2 Calculator instantly computes 2 raised to that power. You can also check whether a given number is a power of 2. Results include the calculated value, the expanded multiplication form, and whether your number qualifies as an exact power of 2. Also try the Modulo Calculator.
2ⁿ Result
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Expanded Form
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Exponent Notation
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Is Power of 2?
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Corresponding Exponent
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An exponent of 2 refers to raising the number 2 to a given power. For example, 2 to the power of 5 (written as 2⁵) means multiplying 2 by itself 5 times: 2 × 2 × 2 × 2 × 2 = 32. The exponent tells you how many times the base (2) is used as a factor. See also our calculate Relatively Prime.
To calculate 2ⁿ, multiply 2 by itself n times for positive exponents. For example, 2³ = 2 × 2 × 2 = 8. For a negative exponent, take the reciprocal: 2⁻³ = 1 / 2³ = 1/8 = 0.125. For n = 0, any base raised to the zero power equals 1, so 2⁰ = 1.
2 to the power of -1 equals 0.5. A negative exponent means you take the reciprocal of the positive power, so 2⁻¹ = 1 / 2¹ = 1/2 = 0.5.
2 to the power of 8 equals 256. You multiply 2 by itself 8 times: 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 = 256. Powers of 2 up to 2¹⁰ (1024) are commonly memorized in computing and mathematics. You might also find our Extended Euclidean Algorithm Calculator useful.
2 to the power of 30 equals 1,073,741,824 — just over one billion. Powers of 2 grow very rapidly; 2³⁰ is approximately 1 GB when used in the context of computer memory (1 gibibyte = 2³⁰ bytes).
2 to the power of 3 equals 8. This is often called '2 cubed' and represents 2 × 2 × 2. It's one of the most common powers of 2 used in everyday math and computer science.
A positive integer n is a power of 2 if dividing it by 2 repeatedly always yields a whole number until you reach 1. Mathematically, n is a power of 2 if n > 0 and (n & (n - 1)) === 0 using bitwise logic. For example, 64 is a power of 2 because 64 = 2⁶, but 48 is not.
Computers use binary (base-2) arithmetic, so powers of 2 appear everywhere in computing — memory sizes (RAM, storage), data structure sizing, color depths, and more. For example, 1 kilobyte = 2¹⁰ = 1024 bytes, and 1 megabyte = 2²⁰ = 1,048,576 bytes.