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PayPal Fee CalculatorCalculate PayPal fee, net received, and gross-up amount.Score 44grossupStripe Fee CalculatorCalculate Stripe processing fee, net received, and gross-up amount.Score 44grossupMarkup CalculatorCalculate markup percentage from cost and selling price.Score 38upBattery Backup CalculatorEstimate battery runtime from capacity, voltage, load, efficiency, and depth of discharge.Score 38upUpload Time CalculatorEstimate upload time from file size and upload speed.Score 38upAtomic Number LookupFind an element by atomic number and view its symbol, mass, group, period, and category.Score 30upSymbol LookupFind full element names and atomic data from element symbols such as K, Fe, or Au.Score 30upKids Multiplication CalculatorExplore multiplication as equal groups with blocks, step-by-step solving, and practice questions.Score 24upInteractive Periodic Table & Element FinderSearch elements by name, symbol, atomic number, or approximate atomic mass, then view atomic data and temperature state estimates.Score 24upCost Per Traveler CalculatorSplit total trip cost across travelers.Score 22upGenerator Fuel CalculatorEstimate generator fuel use and cost from load, runtime, and fuel rate.Score 22upSplit Bill CalculatorSplit a bill by people, tax, service charge, and custom adjustment.Score 22upProfit CalculatorCalculate gross profit, net profit, margin, and markup from revenue and cost.Score 18grossupSales Tax CalculatorAdd or remove sales tax from a purchase amount with local rate support.Score 16grossupKids Division CalculatorUnderstand division as equal sharing with guided steps, visual counters, and answer checking.Score 16upExact Bra Size CalculatorEstimate bra band size, cup size, full size, sister sizes, and fit guidance from band and bust measurements.Score 16upBill Split CalculatorSplit a bill with tip across multiple people.Score 14upCustomer Lifetime Value CalculatorEstimate customer lifetime value from average order value, purchase frequency, gross margin, and churn.Score 14grossRetail Price CalculatorCalculate retail price from wholesale cost, retail margin, and fees.Score 14upPaint Coverage CalculatorEstimate paint gallons needed from wall area and coverage.Score 12up