Calculate percentages online for free with our Percentage Calculator. Find X% of Y, percentage increase/decrease, part-to-whole ratios, and add/subtract percentages with step-by-step formula walkthroughs and 100% offline privacy.
Choose Find Value, Find Percent, Change %, or Math % depending on your calculation needs.
Drag the interactive range sliders or type exact numbers into the input boxes.
Instantly view computed percentage, summary statement, mathematical equation, and step-by-step formula breakdown.
Your calculation inputs are processed entirely inside your browser using client-side JavaScript. Nothing ever travels over a network to any server — making BunchTool 100% private.
Calculations run locally in real time as you move sliders or type numbers. Results and step-by-step mathematical breakdowns update instantly without page reloads.
Solves simple percentages (X% of Y), part-to-whole ratios (X is what % of Y), percentage increase/decrease, and addition/subtraction percentages in one intuitive interface.
Percentages express numbers as a fraction of 100. They are widely used in finance, retail pricing, statistical analysis, and everyday arithmetic.
The fundamental percentage formulas computed by this tool are:
\(\text{1. Find Value: Result} = \left(\frac{\text{Rate}}{100}\right) \times \text{Base}\)
\(\text{2. Find Percent: Rate (\%)} = \left(\frac{\text{Part}}{\text{Whole}}\right) \times 100\)
\(\text{3. Percent Change: } \Delta (\%) = \left(\frac{\text{New} - \text{Original}}{\text{Original}}\right) \times 100\)
\(\text{4. Percentage Math: Result} = \text{Base} \pm \left(\frac{\text{Rate}}{100} \times \text{Base}\right)\)
Whether calculating sales tax (Add %), evaluating store markdowns (Subtract %), analyzing stock growth (Change %), or finding commission rates (Find Percent), mastering these formulas ensures accurate analytical decision-making.