How it works
What this calculadora actually does
The Keyword Extractor works out your keyword extractor in seconds, using the 2026 figures most UK households actually check against.
Most Text tools bury the calculation. Keyword Extractor shows it. Punch in your figures, read the working, share the URL if you need a second opinion.
Word limits are more lenient than people think — until the submission form rejects you. Strip any signature or boilerplate first — then run the count and the rest of this page explains what the answer means.
Strips common English and Portuguese stop-words (the, and, o, e…) and returns the most frequent remaining terms. Handy for a fast content audit.
On this page you will see Text Utilities, TF-IDF research and W3C treated as first-class terms — each one is linked to the calculators and references that use it, so you can follow the thread without retyping queries into a search bar.
If it helps, jump straight to the Text hub or compare with the Character Counter and the Alphabetical Order Tool — those two calcs are the ones readers usually open right after this page.
Following the method end to end
Here's what happens when you plug real numbers in.
Strips common English and Portuguese stop-words (the, and, o, e…) and returns the most frequent remaining terms. Handy for a fast content audit.
Moments this tool earns its keep
Keyword Extractor is aimed at people arriving with questions like these:
- "How to extract keywords"
- "Tf idf calculadora"
- "What is keyword extractor"
- "How to calculate keyword extractor"
- "Keyword extractor formula"
- "Keyword extractor example"
Where the number stops being useful
Every tool has an edge where it stops being the right answer. Keyword Extractor is no exception:
- For legally binding tax or medical decisions — cross-check with HMRC, NHS or a qualified professional.
- For very large or very small extremes the rounding error outgrows the useful precision.
- When the underlying rate or threshold has changed since the page was last reviewed — always verify with the primary source.
- When the input you have is already a derived figure (net of something) — feeding it in as "gross" will double-subtract.
The snags that cost people the answer
Every time you run the count for a new scenario, one of these creeps in — it's worth knowing them ahead of time.
- Misreading the unit in the label — 'per year', 'per month' and 'per day' versions of the same figure differ by 12× or 365×.
- Taking a ratio and multiplying it by the wrong side of the inputs — always write the ratio as A/B with labels before running.
- Trusting a screenshot of someone else’s calculation — rerun it yourself with the same inputs, numbers drift.
- Assuming percentages add up. 10% off then 10% more is not the original price — it is 99% of it.
- Not refreshing the page when thresholds are date-sensitive. If the page was cached yesterday, bank rates may already be yesterday’s.
The sources behind the numbers
Where the maths needs an external authority, we cross-check against:
- TF-IDF research
- W3C
Works well alongside
If this question keeps coming up for you, the same cluster of tools usually comes next:
- Character Counter — Count characters, words, sentences and reading time instantly — with and without spaces.
- Alphabetical Order Tool — Sort any list alphabetically, A-Z or Z-A, with options to deduplicate and ignore case.
How we keep this accurate
Our calculadoras run on pure, unit-tested functions — the same logic lives in the browser and in the CI test suite. When tax rates, thresholds or official figures move, the update lands within 24 hours of the announcement. You can read the editorial policy and corrections policy.
Found an out-of-date number on Keyword Extractor or anywhere else in the Text toolkit? Send it to the editorial desk and we'll patch it. Or browse the full calculadora directory for the next tool you need.