Percentage Calculator: Percent of a Number & Percentage Change

Three quick percentage calculators in one place. Work out a percentage of a number, find what percent one number is of another, or calculate the percentage increase or decrease between two values.

What is X% of Y?

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<iframe data-nl src="https://www.numbrlab.com/embed/percent-of/" title="Percentage of a Number" width="100%" height="338" style="border:0;width:100%;max-width:760px" loading="lazy"></iframe> <p style="font:13px/1.4 sans-serif;margin:4px 0 0">Percentage of a Number by <a href="https://www.numbrlab.com/money/percentage-calculator/">NumbrLab</a></p> <script>addEventListener("message",function(e){if(e.origin!=="https://www.numbrlab.com"||!e.data||!e.data.nlEmbedHeight)return;document.querySelectorAll("iframe[data-nl]").forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.nlEmbedHeight+"px";});});</script>Copy code

X is what percent of Y?

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<iframe data-nl src="https://www.numbrlab.com/embed/percent-what/" title="What Percent Is X of Y" width="100%" height="338" style="border:0;width:100%;max-width:760px" loading="lazy"></iframe> <p style="font:13px/1.4 sans-serif;margin:4px 0 0">What Percent Is X of Y by <a href="https://www.numbrlab.com/money/percentage-calculator/">NumbrLab</a></p> <script>addEventListener("message",function(e){if(e.origin!=="https://www.numbrlab.com"||!e.data||!e.data.nlEmbedHeight)return;document.querySelectorAll("iframe[data-nl]").forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.nlEmbedHeight+"px";});});</script>Copy code

Percentage increase or decrease

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<iframe data-nl src="https://www.numbrlab.com/embed/percent-change/" title="Percentage Change Calculator" width="100%" height="381" style="border:0;width:100%;max-width:760px" loading="lazy"></iframe> <p style="font:13px/1.4 sans-serif;margin:4px 0 0">Percentage Change Calculator by <a href="https://www.numbrlab.com/money/percentage-calculator/">NumbrLab</a></p> <script>addEventListener("message",function(e){if(e.origin!=="https://www.numbrlab.com"||!e.data||!e.data.nlEmbedHeight)return;document.querySelectorAll("iframe[data-nl]").forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.nlEmbedHeight+"px";});});</script>Copy code

Percentage formulas

• X% of Y = X ÷ 100 × Y. For example, 15% of 80 = 12.
• X as a percent of Y = X ÷ Y × 100. For example, 30 of 120 = 25%.
• Percentage change = (new value − old value) ÷ old value × 100.

Frequently asked questions

How do I calculate a percentage increase?

Subtract the old value from the new value, divide by the old value and multiply by 100. From 80 to 100: (100 − 80) ÷ 80 × 100 = a 25% increase.

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