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40  <h1>About Percentage Calculator</h1>
41  <p class="lede">UK percentage calculators with the actual UK numbers in them.</p>
42  <p>Percentage Calculator is part of a family of UK calculator sites: this site,
43        <a href="https://www.percentagecalculator.co.uk">percentagecalculator.co.uk</a>,
44        <a href="https://www.vatcalculator.uk">vatcalculator.uk</a>,
45        <a href="https://www.agecalculator.co.uk">agecalculator.co.uk</a> and
46        <a href="https://www.maths-help.co.uk">maths-help.co.uk</a>.</p>
47
48        <p>All calculators are reviewed in-house by a business analyst against current UK published data
49        (see the <a href="https://www.percentagecalculator.co.uk/about/editorial-reviewer/">editorial reviewer page</a>).</p>
50
51        <h2>How calculations are derived</h2>
52        <p>Each calculator includes the formula, worked examples in pounds with current UK figures, and
53        sources with retrieval dates. UK 2026/27 thresholds are used for tax, NI, ISA, pension and stamp duty
54        calculators. ONS, HMRC, Ofgem, NS&amp;I, Land Registry, and the Bank of England are the primary
55        data sources.</p>
56
57        <h2>Disclaimer</h2>
58        <p>Content here is for general guidance only and is not tax, legal or financial advice.
59        For decisions involving real money, speak to a qualified accountant, tax adviser or financial adviser.</p>
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