Calculate unit depletion rate and periodic depletion expense.
(Tons, barrels, board feet, etc.)
Depletion Rate per Unit:
Depletion Expense for Period:
How to Calculate Depletion Rate
Depletion is the accounting method used to allocate the cost of natural resources as they are extracted or consumed. Unlike depreciation, which applies to physical equipment, depletion applies specifically to resources like timber, minerals, oil, and natural gas.
The Depletion Formula
The calculation generally follows the Units of Production Method. There are two primary steps:
Calculate Periodic Depletion: Depletion Rate × Units Extracted during the specific period.
Real-World Example
Imagine a mining company acquires a coal mine for $1,200,000. They estimate the site contains 300,000 tons of coal. They believe the land can be sold for $200,000 after extraction is complete (Salvage Value).
Unit Rate: $1,000,000 / 300,000 tons = $3.33 per ton
Scenario: If they extract 40,000 tons in Year 1, the depletion expense is 40,000 * $3.33 = $133,200.
Why This Matters
Accurate depletion rate calculation is vital for tax compliance (Internal Revenue Code in the US allows for cost depletion or percentage depletion) and ensures that the company's balance sheet reflects the diminishing value of its natural resource assets over time.
function calculateDepletion() {
var cost = parseFloat(document.getElementById('assetCost').value);
var salvage = parseFloat(document.getElementById('salvageValue').value);
var totalUnits = parseFloat(document.getElementById('totalUnits').value);
var extracted = parseFloat(document.getElementById('extractedUnits').value);
var resultDiv = document.getElementById('depletionResult');
var rateOutput = document.getElementById('unitRateDisplay');
var expenseOutput = document.getElementById('periodExpenseDisplay');
// Validation
if (isNaN(cost) || isNaN(salvage) || isNaN(totalUnits) || isNaN(extracted)) {
alert("Please enter valid numerical values in all fields.");
return;
}
if (totalUnits <= 0) {
alert("Total estimated units must be greater than zero.");
return;
}
if (cost < salvage) {
alert("Cost should typically be higher than the salvage value.");
}
// Calculation Logic
var depletionBase = cost – salvage;
var unitRate = depletionBase / totalUnits;
var periodExpense = unitRate * extracted;
// Formatting
rateOutput.innerHTML = "$" + unitRate.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 4}) + " / unit";
expenseOutput.innerHTML = "$" + periodExpense.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
// Show results
resultDiv.style.display = "block";
}