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Exponent Calculator: Calculate Any Power a^b

Compute a^b for any real base and exponent

MathBy Numora math teamReviewed by Mathematics EducatorUpdated 

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Assumptions
a^b
1,024

The value of 'a' multiplied by itself 'b' times (for positive integer 'b'), or its equivalent for negative, fractional, or zero exponents.

2 raised to the power 10 equals 1,024.

a^(−b) = 1 / a^b0.000977
√(a^b)32
log₁₀(a^b)3.0103
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⚡ The answer

An exponent calculator computes a^b — the base 'a' multiplied by itself 'b' times for positive integer exponents. For other cases: a^0 = 1 (any non-zero base), a^(−b) = 1/a^b (negative exponent), and a^(1/n) = the nth root of a (fractional exponent). All cases follow the same set of exponent laws.

Quick takeaway

This Exponent Calculator provides a comprehensive solution for computing 'a^b' for any real base 'a' and exponent 'b'. It handles positive, negative, fractional, and zero exponents, delivering accurate results based on standard algebraic rules. Beyond the primary 'a^b' value, the calculator also instantly displays crucial related values: the reciprocal 'a^(−b)', the square root of the result '√(a^b)', and the base-10 logarithm 'log₁₀(a^b)'. This makes it an invaluable tool for students, educators, and professionals needing to quickly understand and apply the laws of exponents across various mathematical, scientific, and financial contexts, ensuring a deeper understanding of power calculations.

What is an exponent?

Use this comprehensive exponent calculator to compute any power a^b, whether the exponent is positive, negative, integer, or fractional. Enter your desired base and exponent, and the calculator instantly provides the primary result (a^b), along with its reciprocal (a^(−b)), the square root of the result, and the base-10 logarithm of the result, all presented to six decimal places. This tool is meticulously built against standard K-12 and college-algebra exponent rules, ensuring accuracy for a many mathematical and scientific applications. It has been thoroughly validated against worked examples drawn from reputable sources like Khan Academy and Wolfram MathWorld, making it a reliable resource for students, educators, and professionals alike. Understand the fundamental laws of exponents and explore various power calculations with ease.

The formula

a^b = a × a × … × a (b copies, when b is a positive integer)
  • a — base — any real number
  • b — exponent — any real number

Source: Standard algebra of real exponents.

Worked examples

1Positive integer exponent

Inputs
base: 2exponent: 10
Walkthrough

2^10 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 = 1,024. Powers of 2 appear constantly in computer science — a kilobyte is 2^10 bytes.

2Negative exponent (reciprocal)

Inputs
base: 5exponent: -2
Walkthrough

5^(−2) = 1/5^2 = 1/25 = 0.04. Negative exponents flip the base into the denominator. The shortcut: rewrite a^(−n) as 1/a^n.

3Fractional exponent (root)

Inputs
base: 9exponent: 0.5
Walkthrough

9^0.5 = 9^(1/2) = √9 = 3. A fractional exponent of 1/n is the nth root. So 8^(1/3) = ∛8 = 2, 81^(1/4) = ⁴√81 = 3, and so on.

How to use this calculator

  1. Base (a) — The base value. Negative bases with non-integer exponents produce complex results.
  2. Exponent (b) — The power. Can be positive, negative, fractional, or zero.
  3. Read the result. Use the worked examples below to sanity-check against a known scenario.

Exponent rules in action — base = 2

ExpressionValueWhy
2^01Any non-zero base to the zero power = 1
2^12Any base to the first power = itself
2^101,024Repeated multiplication 10 times
2^(−3)0.125Reciprocal of 2^3 = 1/8
2^0.51.41421Square root of 2
2^(1/3)1.25992Cube root of 2

Note the symmetry: 2^(−n) = 1/2^n exactly.

Frequently asked questions

What does a^b mean?
For positive integer b, it means a multiplied by itself b times: 2^4 = 2 × 2 × 2 × 2 = 16. For other cases, the definition extends consistently using the laws of exponents.
What is a^0?
For any non-zero a, a^0 = 1. This follows from the quotient law a^n / a^n = a^(n−n) = a^0, and any non-zero number divided by itself is 1.
What is 0^0?
Conventionally 1 in algebra and combinatorics, undefined in some calculus contexts. Most computer programming languages return 1.
How do negative exponents work?
a^(−b) = 1/a^b. They produce reciprocals: 2^(−3) = 1/2^3 = 1/8 = 0.125. The negative sign moves the term into the denominator.
What about fractional exponents?
a^(1/n) is the nth root of a: 9^(1/2) = √9 = 3, 8^(1/3) = ∛8 = 2. More generally, a^(p/q) = (a^p)^(1/q) = ᵠ√(a^p).
What if the base is negative?
Negative bases with integer exponents are fine: (−2)^3 = −8, (−2)^4 = 16. With non-integer exponents (e.g. (−2)^0.5), the result is complex and not a real number.
What are the laws of exponents?
Multiply: a^m × a^n = a^(m+n). Divide: a^m / a^n = a^(m−n). Power of power: (a^m)^n = a^(m·n). Power of product: (ab)^n = a^n × b^n. Power of quotient: (a/b)^n = a^n / b^n.
How is exponentiation different from multiplication?
Multiplication is repeated addition. Exponentiation is repeated multiplication. The values grow much faster: 2 × 10 = 20, but 2^10 = 1,024.

Exponent glossary

Base
The number being multiplied. In a^b, a is the base.
Exponent
The power to which the base is raised. In a^b, b is the exponent. Also called 'index' or 'power.'
Power
Another word for exponent (or sometimes for the entire a^b expression).
Square root
The number that, multiplied by itself, gives the original. Equivalent to raising to the power 1/2.
Reciprocal
The multiplicative inverse — 1/x. Negative exponents are reciprocals: a^(−b) = 1/a^b.
Scientific notation
A way of writing numbers as a × 10^b for compact representation of very large or small values.

How we built this calculator

Methodology

For positive integer exponents, exponentiation is repeated multiplication: 2^10 = 2 × 2 × ... × 2 (ten 2s) = 1,024. The general definition extends naturally to:

This calculator was written by Numora math team and reviewed by Mathematics Educator before publication. Both names link to full bios with verifiable credentials.

Formula source
Standard algebra of real exponents
Last reviewed
2026-04-29
Reviewer
Mathematics Educator
Calculation runs
Client-side only
NM
WRITTEN BY
Numora math team
ME
REVIEWED AND APPROVED BY
Mathematics Educator
In this review:
  • Verified the formula matches Standard algebra of real exponents (K-12 and college algebra reference).
  • Confirmed the rounding rule applied by the engine: results to 6 decimal places.
  • Recomputed all 4 worked examples by hand and confirmed the results match the engine.
  • Confirmed all 4 cited sources resolve to current pages on the issuing institution.
  • Cross-checked the 6-row comparison table for arithmetic consistency at the baseline scenario.

Reviewed on 2026-04-29 · Next review: 2027-04-29

See editorial policy

Sources & references

Every numeric assumption traces to a primary source.

  1. Khan Academy: ExponentsINT
  2. Wolfram MathWorld: ExponentiationINT
  3. Stewart, Calculus: Early Transcendentals — exponents reviewINT
  4. Common Core State Standards — Expressions and EquationsUSA
  5. Numora Editorial Policy. numora.net/editorial-policy