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Calculator with Internet & SIM — Monthly Cost Estimator

Estimate the true monthly cost of a SIM-enabled calculator (or similar connected device): plan fees, device financing, and data overage.

Device Price ($)

Upfront Payment ($)

Finance Term (months)

APR (%)

Plan Monthly Fee ($)

Activation/One-time Fee ($)

Data Included (GB/mo)

Your Usage (GB/mo)

Overage Cost ($ per GB)

Calculate Reset

Device Payment ($/mo)

Estimated Overage ($/mo)

Activation Amortized ($/mo)

Effective Cost ($/GB)

Estimated Total Monthly ($)

Show Calculation Steps ▼

Not calculated yet.

// Currency format const simCurrencySymbol = “$”, simFixedCurrency = “USD”; let simSteps = “”; function fmtMoney(n){return simCurrencySymbol + n.toFixed(2) + ” ” + simFixedCurrency;} function fmtNumber(n){return n.toFixed(2);} // Amortized payment (standard loan formula). If APR=0, simple division. function monthlyPayment(principal, annualRatePct, months){ if(months<=0 || principal<=0) return 0; const r = (annualRatePct||0)/100/12; if(r===0) return principal / months; return principal * (r*Math.pow(1+r, months)) / (Math.pow(1+r, months) – 1); } function calcSIMNet(){ simSteps = ""; const deviceCost = parseFloat(document.getElementById("deviceCost").value); const upfront = parseFloat(document.getElementById("upfrontPay").value); const term = parseFloat(document.getElementById("termMonths").value);