DIY vs. Contractor Cost Comparison Calculator
ANA›Life Services Authority›National Calculator Authority›DIY vs. Contractor Cost Comparison Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
DIY vs. Contractor Cost Comparison Calculator
Compare the true cost of doing a project yourself versus hiring a contractor, factoring in materials, labor time, tool rentals, permits, and risk of mistakes.
### Project Materials
Materials Cost (DIY) ($)
Cost of materials if you purchase them yourself (retail price).
Materials Cost (Contractor) ($)
Contractor often gets trade discounts; leave blank to use DIY materials cost.
### DIY Labor & Time
Your Estimated Hours to Complete
Total hours you expect to spend on the project.
Your Hourly Time Value ($/hr)
What your time is worth to you (e.g., your hourly wage or opportunity cost).
### Tools & Equipment
Tool Purchase Cost ($)
Cost of tools you need to buy (one-time).
Tool Rental Cost ($)
Cost of renting specialized tools for this project.
Tool Reuse Value (% of purchase cost you'll recover)
Percentage of tool purchase cost you'll recover through future use or resale (0–100%).
### Permits & Inspections
Permit Cost (DIY) ($)
Permit fees if you pull the permit yourself.
Permit Cost (Contractor) ($)
Permit fees if the contractor handles permitting (may include markup).
### Contractor Quote
Contractor Total Quote ($)
All-in contractor quote (labor + materials + overhead + profit).
### Risk & Quality Adjustments
DIY Mistake/Redo Risk (% of DIY materials cost)
Estimated probability-weighted cost of mistakes requiring rework (0–100%).
Contractor Warranty Value ($)
Estimated value of the contractor's workmanship warranty (peace of mind).
Calculate Comparison
function diyCalc() { // --- Gather inputs --- const matDIY = parseFloat(document.getElementById('diy-materials-diy').value) || 0; let matCont = parseFloat(document.getElementById('diy-materials-contractor').value); if (isNaN(matCont) || matCont 100) errors.push("Tool reuse value must be between 0 and 100%."); if (mistakePct 100) errors.push("Mistake risk must be between 0 and 100%."); if (contQuote 0) { const res = document.getElementById('diy-result'); res.style.display = 'block'; res.innerHTML = 'Please fix the following:' + errors.map(e => '').join('') + ''; return; }
// ============================================================ // FORMULAS // ============================================================
// --- DIY True Cost --- // Net tool cost = tool purchase × (1 - reuse%) + tool rental const netToolCost = toolPurchase * (1 - toolReusePct / 100) + toolRental;
// Opportunity cost of time = hours × hourly value const opportunityCost = hours * hourlyVal;
// Mistake/rework risk cost = materials cost × mistake% const mistakeCost = matDIY * (mistakePct / 100);
// DIY Total (financial outlay only, no time value) const diyFinancial = matDIY + netToolCost + permitDIY + mistakeCost;
// DIY Total (including opportunity cost of time) const diyTrueTotal = diyFinancial + opportunityCost;
// --- Contractor True Cost --- // Contractor total = quote + permit (if separate) - warranty value // Note: if permit is included in quote, user should set contractor permit to 0 const contTrueTotal = contQuote + permitCont - warrantyVal; const contFinancial = contQuote + permitCont;
// --- Savings --- const savingsFinancial = contFinancial - diyFinancial; const savingsTrue = contTrueTotal - diyTrueTotal;
// --- Effective DIY hourly "wage" (how much you save per hour worked) --- // = (Contractor financial cost - DIY financial cost) / hours const effectiveHourlyWage = hours > 0 ? savingsFinancial / hours : 0;
// --- Recommendation --- let recommendation = ''; let recClass = ''; if (savingsTrue > 0 && effectiveHourlyWage >= hourlyVal) { recommendation = '✅ DIY is the better financial choice. You save money even after accounting for your time value.'; recClass = 'calc-good'; } else if (savingsTrue > 0 && effectiveHourlyWage 0) { recommendation = '⚠️ DIY saves cash out-of-pocket, but costs more when time is included. Consider hiring a contractor if your time is valuable.'; recClass = 'calc-warn'; } else { recommendation = '🔴 Hiring a contractor is the better overall value. DIY costs more even before accounting for your time.'; recClass = 'calc-bad'; }
const fmt = v => '$' + Math.abs(v).toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2}); const fmtSigned = v => (v >= 0 ? '+' : '-') + fmt(v);
const res = document.getElementById('diy-result'); res.style.display = 'block'; res.innerHTML = ` ### Comparison Results
Cost ComponentDIYContractor
Materials${fmt(matDIY)}${fmt(matCont)} Labor / Contractor Fee${fmt(opportunityCost)} (opp. cost)${fmt(contQuote - matCont)} (est. labor) Net Tool Cost${fmt(netToolCost)}$0.00 Permits${fmt(permitDIY)}${fmt(permitCont)} Mistake/Rework Risk${fmt(mistakeCost)}$0.00 Warranty Value$0.00-${fmt(warrantyVal)} Financial Outlay (no time)${fmt(diyFinancial)}${fmt(contFinancial)} True Total (incl. time value)${fmt(diyTrueTotal)}${fmt(contTrueTotal)}
Cash Savings (DIY vs. Contractor, no time): = 0 ? 'calc-good' : 'calc-bad'}"> ${savingsFinancial >= 0 ? 'You save ' + fmt(savingsFinancial) + ' by doing it yourself.' : 'DIY costs ' + fmt(savingsFinancial) + ' MORE out-of-pocket.'}
True Savings (including your time value): = 0 ? 'calc-good' : 'calc-bad'}"> ${savingsTrue >= 0 ? 'You save ' + fmt(savingsTrue) + ' overall by doing it yourself.' : 'DIY costs ' + fmt(Math.abs(savingsTrue)) + ' MORE when time is included.'}
${hours > 0 ? `Effective DIY Hourly "Wage": ${fmt(effectiveHourlyWage)}/hr (cash savings ÷ ${hours} hrs; your stated time value: ${fmt(hourlyVal)}/hr)
` : ''}
${recommendation}
`; }
#### Formulas Used
Net Tool Cost = Tool Purchase × (1 − Reuse%) + Tool Rental
Opportunity Cost = Hours × Hourly Time Value
Mistake/Rework Cost = DIY Materials × Mistake Risk%
DIY Financial Outlay = Materials + Net Tool Cost + Permit + Mistake Cost
DIY True Total = DIY Financial Outlay + Opportunity Cost
Contractor True Total = Contractor Quote + Contractor Permit − Warranty Value
Cash Savings = Contractor Financial − DIY Financial
True Savings = Contractor True Total − DIY True Total
Effective DIY Hourly Wage = Cash Savings ÷ Hours Worked
#### Assumptions & References
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