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Bohr Radius CalculatorCalculate Bohr orbit radius for hydrogen-like atoms.Score 50bohrmodelHydrogen Energy Level CalculatorCalculate hydrogen atom energy levels, transition energy, and emitted or absorbed photon wavelength.Score 28bohrmodelSeverance Pay CalculatorEstimate severance pay including weekly pay, severance weeks, and accrued PTO payout.Score 12modelRent vs Buy CalculatorCompare renting cost with owning cost including payment, maintenance, taxes, insurance, and appreciation.Score 12modelClosing Cost CalculatorEstimate buyer closing costs from purchase price, lender fees, taxes, title fees, prepaid items, and down payment.Score 12modelCash Flow CalculatorCalculate net cash flow from income, expenses, debt service, capital costs, and reserves.Score 12modelPolynomial CalculatorEvaluate a polynomial ax^3 + bx^2 + cx + d.Score 12modelProgrammable CalculatorUse editable variables for reusable formula-style calculations.Score 12modelExponential Function CalculatorCalculate exponential growth, e^x, and base-power values.Score 12modelCustomer Lifetime Value CalculatorEstimate customer lifetime value from average order value, purchase frequency, gross margin, and churn.Score 12modelShopify Fee CalculatorEstimate Shopify-style selling and payment fees using your own entered percentage rate, fixed fee, and plan cost assumptions.Score 12modelPayPal Fee CalculatorCalculate PayPal fee, net received, and gross-up amount.Score 12modelSelling Price CalculatorCalculate selling price from product cost, desired margin, marketplace fee, and shipping.Score 12model0-60 Time CalculatorEstimate 0-60 mph time from weight, horsepower, traction, and launch factor.Score 12modelParticle in a Box CalculatorCalculate energy levels, box length, or quantum number approximation for a one-dimensional particle in a box.Score 12modelMortgage CalculatorEstimate monthly mortgage payments, total interest, principal, and payoff cost.Score 2BMI CalculatorCalculate body mass index using metric or imperial units and view the standard BMI category.Score 2Compound Interest CalculatorProject future investment value with compounding frequency and recurring contributions.Score 2Fuel Cost CalculatorEstimate advanced trip fuel cost with distance modes, efficiency units, fuel price units, emissions, commute projections, and vehicle comparisons.Score 2Scientific CalculatorUse a keyboard-friendly scientific calculator with trig, logs, powers, constants, and memory.Score 2