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Percentage Calculator — Free Online Tool
This percentage calculator answers the most common maths question in daily life: what is X percent of Y? Enter the percentage in the first box, the number in the second box and the result updates immediately, so 18% of 2,450 or 7.5% of 85,000 takes a second instead of a calculator detour. Students use it to turn exam marks into scores, shopkeepers use it for margins and commission, and salaried employees in India use it to estimate an annual increment or the deduction on a bonus. The underlying formula is simply value multiplied by percentage divided by 100. Because the tool is intentionally focused on this one calculation it stays quick and unambiguous, and you can type decimals such as 12.5 or 0.75 when you need precision. If you want the percentage that one number is of another, or the change between an old and new figure, the FAQ below shows the quick formulas so you can do them with the same inputs. The calculator runs entirely in your browser, works on mobile, shows two decimal places and does not need any sign-up, making it a reliable everyday helper for finance, shopping, studies and business reports.
Use our Percentage Calculator on AllConvertor — no registration, no download, works on iPhone, Android, Windows, and Mac. All processing runs in your browser when possible for maximum privacy and speed.
How to use Percentage Calculator
- Type the percentage you want to apply in the Percentage field.
- Enter the number or amount in the Of Value field.
- Read the result shown instantly below the inputs.
- Change either value to recalculate without reloading.
Key benefits
- ✓ 100% free — no paywall or trial limits
- ✓ No account or email required
- ✓ Mobile-friendly responsive design
- ✓ Instant results in your browser
- ✓ Secure — data stays on your device
- ✓ Trusted by thousands of users daily
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Frequently Asked Questions
How do I calculate X% of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 2,000 is 2,000 × 15 ÷ 100 = 300.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. If you scored 432 out of 600, then 432 ÷ 600 × 100 = 72%.
How do I calculate percentage increase or decrease?
Subtract the old value from the new value, divide by the old value and multiply by 100. Going from 40,000 to 44,000 is a (44,000 − 40,000) ÷ 40,000 × 100 = 10% increase.
Can I use decimals such as 7.5%?
Yes. The inputs accept decimals, and the answer is shown rounded to two decimal places.
Can this help with CGPA or marks percentage?
It works for marks out of 100. For a CGPA-to-percentage conversion, multiply by the multiplier your board or university specifies, for example 9.5 for CBSE, then enter it here if you need a derived amount.