How do I take a logarithm with a custom base?

Write log(8, 2) — the first argument is the number, the second is the base, giving 3. log(x) alone is base 10; use ln(x) for the natural logarithm.

How do I work in degrees?

Click DEG at the top and sin(30) becomes 0.5. In radian mode you can also write sin(rad(30)) or sin(pi/6).

The result of the last expression you confirmed with Enter. Compute 12*5 to get 60, then write ans/4 for 15.

Is anything uploaded?

No. Parsing and evaluation happen entirely in your browser.

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🧮Online Scientific Calculator - Type a Whole Expression

Type the whole expression and see the answer update as you go. Parentheses, powers, factorials, trigonometry, logarithms and combinations are all supported, you can switch between degrees and radians, and the previous answer is kept in ans for the next line.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

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How to use Scientific Calculator

1Type an expression such as 2*(3+4)^2 or sin(pi/6)+ln(e)
2Switch to DEG if you want trigonometric functions to use degrees
3Press Enter to store the answer in ans and reuse it in the next expression

FAQ

How do I take a logarithm with a custom base?: Write log(8, 2) — the first argument is the number, the second is the base, giving 3. log(x) alone is base 10; use ln(x) for the natural logarithm.
How do I work in degrees?: Click DEG at the top and sin(30) becomes 0.5. In radian mode you can also write sin(rad(30)) or sin(pi/6).
What is ans?: The result of the last expression you confirmed with Enter. Compute 12*5 to get 60, then write ans/4 for 15.
Is anything uploaded?: No. Parsing and evaluation happen entirely in your browser.