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The Percentage Calculator handles the three percentage questions everyone asks, in one clean tool. Mode one finds X% of Y (discounts, tips, commissions). Mode two finds what percentage X is of Y (test scores, completion rates). Mode three computes the percentage increase or decrease between two numbers (price changes, growth rates).
How to use: 1) Pick the mode that matches your question using the tabs. 2) Enter the two numbers. 3) Click Calculate. For percent change, enter the old value first and the new value second - the tool tells you whether it is an increase or a decrease and by how much.
Why use it? Percentages are everywhere - sale prices, salary raises, investment returns, grade calculations - and getting them wrong costs real money or marks. This tool removes the mental arithmetic and the classic mistakes, like dividing by the wrong number in percent-change problems.
Key benefits: Three dedicated modes, no confusing generic form. Clear labeled answers ("20% of 150 = 30"). Handles increase vs decrease automatically. Instant, free and private.
Tips to avoid common mistakes: For discounts, calculate X% of the price and subtract - or compute (100-X)% of the price directly for the final amount in one step. Remember that a 50% increase followed by a 50% decrease does not return to the start (100 becomes 150, then 75), because the base changes each time. Do not confuse "percent" with "percentage points": a rate rising from 10% to 12% is a 2-percentage-point rise but a 20% relative increase. When reversing a calculation - for example finding the original price before a 20% discount - divide by 0.8 rather than subtracting 20% of the discounted price, which gives the wrong answer. For quick mental math, remember that 10% of any number is the number with the decimal moved one place left - halve it for 5%, double it for 20%.
FAQs: How do I calculate a discount? Use "X% of Y" to find the discount amount, then subtract it from the price. Why does percent change divide by the old value? Change is always measured relative to where you started. Can the old value be zero? No - percent change from zero is undefined, and the tool will tell you. Do I need to create an account? Never - all FistHost tools work without signup.
Related tools: The Tip Calculator and Salary Calculator both build on these percentage basics - try them next for real-world applications.
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