vPercentage is a free, friendly online percentage calculator that tackles everything from simple ratios to complex compound changes. Whether you’re comparing discounts, analyzing business margins, or tracking fitness stats, it gives you instant, accurate results with clear, step-by-step explanations. Choose from specialized tools like basic percentage, percentage increase, difference, reverse percentage, compound percentage, margin, and distribution calculators. It works entirely in your browser without any sign-up, keeping your data private and accessible anywhere.