Moonfes Calculators

Free online calculators. Fast, accurate, no signup. Pick a tool below to get started.

Percentage CalculatorCalculate X% of Y, find what percent one number is of another, or compute percentage change between two values.
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Discount CalculatorWork out sale prices, stacked discounts, and reverse the math to find the original price from a sale.
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Tip CalculatorTip amount, total, and per-person split. Supports pre-tax tipping, rounding, and eight currencies.
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Sales Tax CalculatorAdd sales tax for any of the 50 US states or work backwards from a total to find the pre-tax price.
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Grade CalculatorCalculate simple, weighted, or required-final-exam grades. Letter grade and GPA on standard or plus/minus scales.
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Markup CalculatorFind selling price, markup, or cost. See profit and margin side by side, plus typical markup ranges by industry.
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