Percentage Calculator - Streets Services

Calculators

🔢 What is X% of Y?

What is % of =

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❓ X is what % of Y?

is what % of =

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📈 Percentage Change (from X to Y)

From to =

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➕ Increase / Decrease by %

% =

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📊 Score / Proportion to Percentage

out of =

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🔄 Reverse — Find Original Value

If is % of original, original =

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Percentage Tips

💡 Mental Maths Trick

10% of any number is just moving the decimal point one place left. 5% is half of that. 1% is moving it two places. Build up complex percentages from these simple parts.

📈 % Change Formula

((New − Old) ÷ Old) × 100. A positive result is an increase, a negative result is a decrease. The order matters — from 50 to 75 is +50%, but from 75 to 50 is −33.3%.

🔄 X% of Y = Y% of X

Percentage is commutative! 8% of 25 = 25% of 8 = 2. Use whichever calculation is easier in your head.

💰 VAT Tip

To find the pre-VAT price from a VAT-inclusive price (20% UK VAT), divide by 1.20. To add 20% VAT to a net price, multiply by 1.20.