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PayPal Fee CalculatorCalculate PayPal fee, net received, and gross-up amount.Score 104paypalcalculatorgrossStripe Fee CalculatorCalculate Stripe processing fee, net received, and gross-up amount.Score 64calculatorgrossupMarkup CalculatorCalculate markup percentage from cost and selling price.Score 58upcalculatorBattery Backup CalculatorEstimate battery runtime from capacity, voltage, load, efficiency, and depth of discharge.Score 58upcalculatorUpload Time CalculatorEstimate upload time from file size and upload speed.Score 58upcalculatorSelling Price CalculatorCalculate selling price from product cost, desired margin, marketplace fee, and shipping.Score 52calculatorupKids Multiplication CalculatorExplore multiplication as equal groups with blocks, step-by-step solving, and practice questions.Score 44calculatorupCost Per Traveler CalculatorSplit total trip cost across travelers.Score 42calculatorupAvogadro's Number CalculatorConvert moles to particles using Avogadro's number.Score 42calculatorupGenerator Fuel CalculatorEstimate generator fuel use and cost from load, runtime, and fuel rate.Score 42calculatorupSplit Bill CalculatorSplit a bill by people, tax, service charge, and custom adjustment.Score 42calculatorupProfit CalculatorCalculate gross profit, net profit, margin, and markup from revenue and cost.Score 38calculatorgrossupScientific CalculatorUse a keyboard-friendly scientific calculator with trig, logs, powers, constants, and memory.Score 36calculatorupSales Tax CalculatorAdd or remove sales tax from a purchase amount with local rate support.Score 36calculatorgrossupKids Division CalculatorUnderstand division as equal sharing with guided steps, visual counters, and answer checking.Score 36calculatorupExact Bra Size CalculatorEstimate bra band size, cup size, full size, sister sizes, and fit guidance from band and bust measurements.Score 36calculatorupBill Split CalculatorSplit a bill with tip across multiple people.Score 34calculatorupCustomer Lifetime Value CalculatorEstimate customer lifetime value from average order value, purchase frequency, gross margin, and churn.Score 34calculatorgrossRetail Price CalculatorCalculate retail price from wholesale cost, retail margin, and fees.Score 34calculatorupFuel Cost CalculatorEstimate advanced trip fuel cost with distance modes, efficiency units, fuel price units, emissions, commute projections, and vehicle comparisons.Score 32calculator