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Kordu Tools
Finance Runs in browser Updated 08 Apr 2026

Sales Tax Calculator

Add or remove sales tax/VAT from any price instantly. Quick presets for common rates.

Pre-tax price

Tax amount20.00
Total (inc. tax)120.00
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How to use Sales Tax Calculator

  1. Choose a mode

    Select 'Add tax to price' to calculate the total with tax, or 'Remove tax from price' to extract the pre-tax amount from a tax-inclusive price.

  2. Enter the amount and rate

    Type the price and tax rate, or click a quick-select button for common rates like 20% (UK VAT) or 10% (Australian GST).

  3. Read the results

    The tax amount and final total (or pre-tax price) are calculated instantly.

Sales Tax Calculator FAQ

How do I calculate VAT on a UK price?
Enter the pre-tax price, select 20% (the standard UK VAT rate), and choose 'Add tax to price'. The calculator shows the VAT amount and the total price including VAT.

How do I remove VAT from a price that already includes it?
Switch to 'Remove tax from price' mode, enter the VAT-inclusive total, and set the rate to 20%. The pre-tax price and VAT amount are shown separately.

What is the formula for removing tax from an inclusive price?
Pre-tax price = total ÷ (1 + rate/100). For a £120 total at 20% VAT: £120 ÷ 1.2 = £100 pre-tax. Tax amount = £120 − £100 = £20.

Can I use this for US sales tax?
Yes. US sales tax is applied the same way — type any rate from 0% to 99%. US rates vary by state and locality (typically 4%–11%).

What rates are the presets for?
5% covers some US states and reduced UK VAT; 10% is Australian GST and some EU reduced rates; 15% covers New Zealand GST and some EU rates; 20% is standard UK VAT and some EU countries; 23% covers Ireland and Poland; 25% covers Sweden, Denmark, and Norway.

Is my data sent anywhere?
No. All calculations happen in your browser. Nothing is uploaded or stored.

Background

The Kordu Sales Tax Calculator works in two directions. Add tax mode takes a pre-tax price and a rate, and calculates the tax amount and final total. Remove tax mode takes a tax-inclusive price and extracts the pre-tax price and tax portion — useful when a receipt shows the total and you need to know what the tax was.

Quick-select buttons for common rates (5%, 10%, 15%, 20%, 23%, 25%) let you switch rates instantly. Type any rate directly for custom values.

Common uses: checking VAT on UK invoices (20%), calculating GST for Australian purchases (10%), verifying European VAT rates, working out sales tax for US purchases, and reverse-calculating tax from receipt totals.

All calculations run in your browser. Nothing is uploaded or stored.

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