Basic (Steam Gauges)
Partial Upgrade (GPS/ADS-B Out)
Modern Glass (G500/G3X/Autopilot)
Poor / Needs Work
Average
Excellent / Recently Redone
Estimated Market Value
How to Use the Aircraft Valuation Calculator
Valuing an aircraft is significantly different from valuing a car. In aviation, the "mid-time" example of a specific model serves as the baseline. This calculator uses professional appraisal logic to adjust that baseline based on the remaining life of critical components and the quality of equipment installed.
Key Valuation Factors
Engine Life (TSMOH): The engine is often 20-30% of the total aircraft value. We calculate the "pro-rata" value remaining on the engine. If an engine has a 2,000-hour TBO and 1,000 hours have been used, it is at mid-life. If it only has 200 hours used, it adds significant value.
Total Airframe Hours (TTAF): Higher airframe hours generally indicate more wear and tear on structural components. A standard general aviation aircraft typically flies 50-100 hours per year. Anything significantly higher or lower will adjust the price.
Avionics Upgrades: A "glass cockpit" (modern digital displays) can add $40,000 to $80,000 to the value of a legacy airframe. Conversely, an aircraft with only basic VFR steam gauges is valued at the baseline.
Maintenance Status: While not fully captured in a basic calculator, the proximity to the next Annual Inspection and the completeness of logbooks are critical for final negotiations.
Example Valuation
Imagine a 1975 Cessna 172. The market base price for a mid-time unit might be $120,000. If the engine has only 100 hours since a $35,000 overhaul, it adds roughly $16,500 in value compared to a mid-time engine. If it has a modern Garmin G3X suite, you might add another $30,000. Conversely, if the paint is peeling, you might subtract $5,000.
Note: This tool provides a mathematical estimate. A professional pre-buy inspection and a certified appraisal are essential before any aircraft transaction.
function calculateAircraftValue() {
var basePrice = parseFloat(document.getElementById('basePrice').value);
var year = parseInt(document.getElementById('year').value);
var ttaf = parseFloat(document.getElementById('ttaf').value);
var tsmoh = parseFloat(document.getElementById('tsmoh').value);
var tbo = parseFloat(document.getElementById('tbo').value);
var overhaulCost = parseFloat(document.getElementById('overhaulCost').value);
var avionicsValue = parseFloat(document.getElementById('avionics').value);
var interiorValue = parseFloat(document.getElementById('interior').value);
if (isNaN(basePrice) || isNaN(ttaf) || isNaN(tsmoh) || isNaN(tbo)) {
alert("Please enter all required numerical values.");
return;
}
// 1. Engine Life Adjustment
// Baseline is mid-time engine (TBO / 2)
var midTime = tbo / 2;
var engineAdjustment = (midTime – tsmoh) * (overhaulCost / tbo);
// 2. Airframe Hours Adjustment
// Typical GA airframe averages around 4000 hours as a neutral point for legacy planes
// We adjust by roughly $10 per hour deviation from 4000
var airframeAdjustment = (4000 – ttaf) * 12;
// 3. Age Adjustment (Simplified)
// Small bonus for newer years compared to a 1975 baseline
var ageAdjustment = 0;
if (!isNaN(year)) {
ageAdjustment = (year – 1975) * 1500;
}
// 4. Calculate Final Total
var totalValue = basePrice + engineAdjustment + airframeAdjustment + ageAdjustment + avionicsValue + interiorValue;
// Sanity floor (an aircraft is worth at least salvage value)
if (totalValue < (basePrice * 0.3)) {
totalValue = basePrice * 0.3;
}
// Display Logic
var resultBox = document.getElementById('valuation-result-box');
var finalValueDisplay = document.getElementById('finalValue');
var breakdownDisplay = document.getElementById('breakdown');
resultBox.style.display = 'block';
finalValueDisplay.innerText = '$' + totalValue.toLocaleString(undefined, {minimumFractionDigits: 0, maximumFractionDigits: 0});
breakdownDisplay.innerHTML = "Breakdown:" +
"• Base Value: $" + basePrice.toLocaleString() + "" +
"• Engine Life Adj: " + (engineAdjustment >= 0 ? "+" : "") + "$" + Math.round(engineAdjustment).toLocaleString() + " (" + (tbo – tsmoh) + " hours remaining)" +
"• Airframe Adj: " + (airframeAdjustment >= 0 ? "+" : "") + "$" + Math.round(airframeAdjustment).toLocaleString() + "" +
"• Equipment & Cosmetics: " + (avionicsValue + interiorValue >= 0 ? "+" : "") + "$" + (avionicsValue + interiorValue).toLocaleString();
resultBox.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}