{
  "slug": "cost-to-replace-an-engine-calculator",
  "title": "Cost to Replace an Engine Calculator",
  "heading": "Cost to Replace an Engine Calculator",
  "category": "financial",
  "url": "https://www.revenuelab.fyi/toolbox/cost-to-replace-an-engine-calculator",
  "summary": "Long block, swap labor and state rates, checked against buying another car.",
  "description": "Replacing an engine is one of the few repairs where the right answer is often 'don't', and the only way to know is to put the swap next to the alternative in the same units. This calculator prices the engine itself — used, remanufactured long block, or new crate — the ancillary parts that always go on with it (gaskets, belts, water pump, fluids, sometimes a clutch or torque converter), and the swap labor at your state's shop rate with a dealer premium if applicable. It then compares the total to the depreciated cost per year of a replacement vehicle, which is the comparison people actually face. Worked assumption for the defaults: a $3,400 remanufactured long block, $650 of ancillaries, 14 book hours at the $105 US-average rate, 7.25% tax — about $5,800, which is roughly 24 months of ownership on a $16,000 replacement car losing $2,900 a year.",
  "formula": "Total = (engine + ancillary parts) × (1 + tax) + hours × state rate × dealer multiplier; months of alternative = total ÷ (replacement car annual depreciation ÷ 12).",
  "dateModified": "2026-09-06",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=cost-to-replace-an-engine-calculator",
  "inputs": [
    {
      "id": "engine",
      "label": "Engine source",
      "kind": "select",
      "hint": null,
      "default": "3400",
      "options": [
        {
          "value": "1600",
          "label": "Used engine with mileage — $1,600"
        },
        {
          "value": "3400",
          "label": "Remanufactured long block — $3,400"
        },
        {
          "value": "5200",
          "label": "New crate engine — $5,200"
        },
        {
          "value": "7800",
          "label": "Dealer factory engine assembly — $7,800"
        }
      ]
    },
    {
      "id": "ancillary",
      "label": "Gaskets, belts, pump, fluids, sensors",
      "kind": "number",
      "hint": null,
      "default": 650,
      "unit": "$",
      "min": 0,
      "max": 5000
    },
    {
      "id": "hours",
      "label": "Book labor hours for the swap",
      "kind": "number",
      "hint": null,
      "default": 14,
      "unit": "hours",
      "min": 4,
      "max": 45
    },
    {
      "id": "laborRate",
      "label": "State shop labor rate",
      "kind": "select",
      "hint": "Independent-shop door rate for your state band. Dealer rates are handled separately below.",
      "default": "105",
      "options": [
        {
          "value": "105",
          "label": "US average — $105/hr"
        },
        {
          "value": "82",
          "label": "AL, AR, MS, KY, WV, OK — $82/hr"
        },
        {
          "value": "90",
          "label": "TN, MO, IN, KS, IA, NE, SC — $90/hr"
        },
        {
          "value": "98",
          "label": "TX, GA, OH, MI, NC, FL, AZ — $98/hr"
        },
        {
          "value": "112",
          "label": "PA, MN, WI, NV, UT, VA — $112/hr"
        },
        {
          "value": "125",
          "label": "IL, CO, OR, NJ, MD, NY (upstate) — $125/hr"
        },
        {
          "value": "140",
          "label": "MA, WA, CT, HI, NY metro — $140/hr"
        },
        {
          "value": "155",
          "label": "CA metro (Bay Area, LA, San Diego) — $155/hr"
        }
      ]
    },
    {
      "id": "dealerMult",
      "label": "Who does the work",
      "kind": "select",
      "hint": null,
      "default": "1",
      "options": [
        {
          "value": "1",
          "label": "Independent shop — state rate"
        },
        {
          "value": "1.25",
          "label": "Chain / franchise — +25%"
        },
        {
          "value": "1.5",
          "label": "Dealer service department — +50%"
        }
      ]
    },
    {
      "id": "taxRate",
      "label": "State + local sales tax on parts",
      "kind": "select",
      "hint": "Most states tax parts; several tax labor too. Pick the band closest to your county rate.",
      "default": "7.25",
      "options": [
        {
          "value": "0",
          "label": "No sales tax — AK, DE, MT, NH, OR"
        },
        {
          "value": "4",
          "label": "Low — HI, WY, WI, ME (~4%)"
        },
        {
          "value": "6",
          "label": "Mid — MI, KY, MD, PA, VA (~6%)"
        },
        {
          "value": "7.25",
          "label": "US average with local add-ons (~7.25%)"
        },
        {
          "value": "8.5",
          "label": "High — CA, IL, NY, WA metro (~8.5%)"
        },
        {
          "value": "9.5",
          "label": "Highest — LA, TN, AR, AL local combos (~9.5%)"
        }
      ]
    },
    {
      "id": "replacementPrice",
      "label": "Price of a replacement vehicle",
      "kind": "number",
      "hint": null,
      "default": 16000,
      "unit": "$",
      "min": 1000,
      "max": 200000
    },
    {
      "id": "depreciation",
      "label": "Replacement vehicle depreciation",
      "kind": "number",
      "hint": null,
      "default": 18,
      "unit": "%/yr",
      "min": 2,
      "max": 40
    }
  ],
  "outputs": [
    {
      "id": "total",
      "label": "Likely engine replacement cost",
      "format": "currency",
      "hint": null,
      "primary": true
    },
    {
      "id": "low",
      "label": "Low end of quote range",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "high",
      "label": "High end of quote range",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "parts",
      "label": "Parts including tax",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "labor",
      "label": "Swap labor",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "annualDep",
      "label": "Replacement car depreciation per year",
      "format": "currency",
      "hint": null,
      "primary": false
    },
    {
      "id": "months",
      "label": "Months of replacement-car depreciation this buys",
      "format": "number",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Engine source: Remanufactured long block — $3,400",
      "Gaskets, belts, pump, fluids, sensors: 650 $",
      "Book labor hours for the swap: 14 hours",
      "State shop labor rate: US average — $105/hr",
      "Who does the work: Independent shop — state rate",
      "State + local sales tax on parts: US average with local add-ons (~7.25%)",
      "Price of a replacement vehicle: 16000 $",
      "Replacement vehicle depreciation: 18 %/yr"
    ],
    "outputs": [
      "Likely engine replacement cost: $5,814",
      "Low end of quote range: $4,942",
      "High end of quote range: $7,093",
      "Parts including tax: $4,344",
      "Swap labor: $1,470",
      "Replacement car depreciation per year: $2,880",
      "Months of replacement-car depreciation this buys: 24"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter engine source.",
      "Enter gaskets, belts, pump, fluids, sensors ($).",
      "Enter book labor hours for the swap (hours).",
      "Enter state shop labor rate — Independent-shop door rate for your state band. Dealer rates are handled separately below..",
      "Enter who does the work.",
      "Enter state + local sales tax on parts — Most states tax parts; several tax labor too. Pick the band closest to your county rate..",
      "Enter price of a replacement vehicle ($).",
      "Enter replacement vehicle depreciation (%/yr).",
      "Read your likely engine replacement cost on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "engine": "3400",
        "ancillary": 400,
        "hours": 8.4,
        "laborRate": "105",
        "dealerMult": "1",
        "taxRate": "7.25",
        "replacementPrice": 9500,
        "depreciation": 11
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "engine": "3400",
        "ancillary": 650,
        "hours": 14,
        "laborRate": "105",
        "dealerMult": "1",
        "taxRate": "7.25",
        "replacementPrice": 16000,
        "depreciation": 18
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "engine": "3400",
        "ancillary": 1050,
        "hours": 22.400000000000002,
        "laborRate": "105",
        "dealerMult": "1",
        "taxRate": "7.25",
        "replacementPrice": 25500,
        "depreciation": 29
      }
    }
  ],
  "limitations": [
    "Results are estimates before tax, fees, and inflation unless an input explicitly covers them.",
    "Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.",
    "This is educational maths, not financial advice. Check anything contractual with the lender or your accountant."
  ],
  "faq": [
    {
      "q": "Where do the state labor rates come from?",
      "a": "They are independent-shop door rates by state band — what a non-dealer shop charges per book hour before parts. Rates cluster tightly by market cost of living, which is why the tool groups states rather than pretending each one has a single number. If you already have a quote, back out the shop's own rate and use that."
    },
    {
      "q": "Used engine or remanufactured?",
      "a": "A used engine is a gamble on someone else's maintenance with a short parts-only warranty. A remanufactured long block is rebuilt to spec with a multi-year warranty and is the default recommendation on any car you intend to keep more than two years."
    },
    {
      "q": "Does replacing the engine reset the odometer or the value?",
      "a": "Neither. The odometer keeps counting and buyers discount the car anyway, though documented receipts for a reman engine do help. Replace an engine to keep driving the car, not to resell it."
    },
    {
      "q": "Why show a range instead of one price?",
      "a": "Because two honest shops quote the same job 20–30% apart on parts sourcing alone — OEM versus quality aftermarket, remanufactured versus new, and whether the flat-rate book hours match what the job actually takes on your vehicle. The range is the band most real quotes land inside; the midpoint is what to expect."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/cost-to-replace-a-transmission-calculator",
    "https://www.revenuelab.fyi/toolbox/cost-to-replace-a-hybrid-battery-calculator"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Cost to Replace an Engine Calculator (https://www.revenuelab.fyi/toolbox/cost-to-replace-an-engine-calculator)"
}