body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
line-height: 1.6;
color: #333;
max-width: 800px;
margin: 0 auto;
padding: 20px;
}
.calculator-wrapper {
background-color: #f8f9fa;
border: 1px solid #e9ecef;
border-radius: 8px;
padding: 30px;
margin-bottom: 40px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.calc-title {
text-align: center;
margin-top: 0;
color: #2c3e50;
margin-bottom: 25px;
}
.form-group {
margin-bottom: 20px;
}
.form-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #495057;
}
.form-control {
width: 100%;
padding: 12px;
font-size: 16px;
border: 1px solid #ced4da;
border-radius: 4px;
box-sizing: border-box;
transition: border-color 0.15s ease-in-out;
}
.form-control:focus {
border-color: #007bff;
outline: 0;
}
.calc-btn {
display: block;
width: 100%;
padding: 14px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: 600;
cursor: pointer;
transition: background-color 0.2s;
margin-top: 10px;
}
.calc-btn:hover {
background-color: #0056b3;
}
.result-box {
margin-top: 25px;
padding: 20px;
background-color: #e8f4fd;
border-left: 5px solid #007bff;
border-radius: 4px;
display: none;
}
.result-label {
font-size: 14px;
color: #6c757d;
text-transform: uppercase;
letter-spacing: 1px;
font-weight: 700;
}
.result-value {
font-size: 32px;
font-weight: bold;
color: #2c3e50;
margin: 10px 0 5px 0;
}
.result-explanation {
font-size: 15px;
color: #555;
}
.article-content h1 {
color: #2c3e50;
font-size: 2.5em;
margin-bottom: 20px;
}
.article-content h2 {
color: #34495e;
border-bottom: 2px solid #eee;
padding-bottom: 10px;
margin-top: 40px;
}
.article-content h3 {
color: #495057;
margin-top: 25px;
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.article-content ul {
background: #fdfdfd;
padding: 20px 40px;
border-radius: 5px;
border: 1px solid #eee;
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.article-content li {
margin-bottom: 10px;
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.formula-box {
background-color: #fff3cd;
border: 1px solid #ffeeba;
color: #856404;
padding: 20px;
text-align: center;
font-size: 1.2em;
font-weight: bold;
border-radius: 5px;
margin: 20px 0;
font-family: "Courier New", monospace;
}
.error-msg {
color: #dc3545;
font-size: 14px;
margin-top: 5px;
display: none;
}
function updateBaseLabel() {
var type = document.getElementById("baseType").value;
var label = document.getElementById("baseLabel");
if (type === "Direct Labor Cost") {
label.innerText = "Estimated Total Direct Labor Cost ($)";
document.getElementById("allocationBase").placeholder = "e.g., 1000000";
} else {
label.innerText = "Estimated Total " + type;
document.getElementById("allocationBase").placeholder = "e.g., 25000";
}
}
function calculatePOHR() {
// Get Input Values
var overheadCost = parseFloat(document.getElementById("overheadCost").value);
var allocationBase = parseFloat(document.getElementById("allocationBase").value);
var baseType = document.getElementById("baseType").value;
var resultBox = document.getElementById("resultBox");
var errorMsg = document.getElementById("errorMsg");
// Reset Error
errorMsg.style.display = "none";
resultBox.style.display = "none";
// Validate Inputs
if (isNaN(overheadCost) || isNaN(allocationBase) || allocationBase <= 0 || overheadCost < 0) {
errorMsg.style.display = "block";
return;
}
// Calculate Rate
var rate = overheadCost / allocationBase;
var formattedRate = "";
var explanation = "";
// Format Output based on Type
if (baseType === "Direct Labor Cost") {
// Usually expressed as a percentage of labor cost
var percentage = rate * 100;
formattedRate = percentage.toFixed(2) + "%";
explanation = "of Direct Labor Cost. For every $1.00 of direct labor, apply $" + rate.toFixed(2) + " of overhead.";
} else {
// Expressed as currency per unit/hour
formattedRate = "$" + rate.toFixed(2);
// Singularize unit for display
var unitName = baseType;
if (unitName.endsWith("s")) {
unitName = unitName.slice(0, -1);
}
explanation = "per " + unitName;
}
// Display Results
document.getElementById("resultValue").innerHTML = formattedRate;
document.getElementById("resultText").innerHTML = explanation;
resultBox.style.display = "block";
}
How Do You Calculate the Predetermined Overhead Rate?
Calculating the predetermined overhead rate (POHR) is a fundamental step in job-order costing and managerial accounting. It allows manufacturers and service providers to estimate the total cost of a job before the actual overhead costs are finalized at the end of the accounting period.
Without a predetermined rate, a company would have to wait until the end of the year to know how much a product actually cost to produce. This would make pricing decisions, quoting customers, and interim financial reporting nearly impossible. The POHR bridges this gap by using estimates.
The Predetermined Overhead Rate Formula
The calculation is straightforward, but it relies heavily on accuracy during the budgeting phase. The formula is computed at the beginning of the year (or period) using the following equation:
Predetermined Overhead Rate = Estimated Total Manufacturing Overhead / Estimated Total Allocation Base
Where:
- Estimated Total Manufacturing Overhead: The sum of all indirect manufacturing costs (indirect materials, indirect labor, factory rent, utilities, depreciation) expected for the upcoming period.
- Estimated Total Allocation Base: The driver used to assign costs. This represents the total activity level expected for the period.
Step-by-Step Calculation Guide
Step 1: Estimate Overhead Costs
Review historical data and adjust for anticipated changes in pricing, production volume, or efficiency. Sum up all indirect costs associated with the production facility.
Step 2: Choose an Allocation Base
Select a cost driver that has a causal relationship with the overhead costs. This base should fluctuate similarly to how the overhead costs fluctuate. Common bases include:
- Direct Labor Hours: Used when production is labor-intensive.
- Machine Hours: Used in highly automated manufacturing environments.
- Direct Labor Cost: Used when overhead rates are tied closely to wage rates (result is often a percentage).
Step 3: Estimate the Allocation Base Level
Forecast how much of the allocation base (e.g., how many machine hours) will be utilized during the upcoming period based on production targets.
Step 4: Divide
Divide the total estimated cost (Step 1) by the total estimated base (Step 3). This gives you the rate to apply to every job throughout the year.
Example Calculation
Let's assume a furniture manufacturing company, "WoodCraft Co.", is preparing its budget for the year.
- Estimated Overhead Costs: Factory rent ($120,000), Utilities ($30,000), Indirect materials ($50,000). Total = $200,000.
- Allocation Base: Since their work is done by hand, they use Direct Labor Hours.
- Estimated Activity: They plan to work 10,000 direct labor hours this year.
Calculation:
$200,000 / 10,000 hours = $20.00 per Direct Labor Hour
If a specific custom table takes 15 hours to build, WoodCraft Co. will apply $300 ($20.00 × 15) of overhead to that job, in addition to the direct materials and direct labor costs.
Why is the Rate "Predetermined"?
It is called "predetermined" because it is calculated before the period begins. Actual overhead rates can only be calculated at the end of the period, which is too late for decision-making. At the end of the year, accountants will reconcile the difference between the "Applied Overhead" (using the POHR) and the "Actual Overhead" incurred, adjusting for any overapplied or underapplied overhead.