Margins, markup, ROI, discounts, tips, and sales tax for pricing decisions — private browser calculators without a spreadsheet.
Calculate profit, margin %, and markup from cost and revenue.
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Set a markup % on cost to get selling price and implied margin.
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Measure return on investment from cost and total return.
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Compute sale price, savings, and optional tax from a discount %.
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Add sales tax to a pre-tax amount and see tax plus total due.
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Split the bill with tip percentage and per-person totals instantly.
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