Project Cost Calculator Formula

Understand the math behind the project cost calculator. Each variable explained with a worked example.

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Formulas Used

Subtotal (before contingency)

subtotal_display = subtotal

Contingency Amount

contingency_amount = subtotal * contingency_pct / 100

Total Project Cost

total_cost = subtotal * (1 + contingency_pct / 100)

Variables

Variable	Description	Default
`labor`	Labor Costs(USD)	12000
`materials`	Material Costs(USD)	8000
`equipment`	Equipment Costs(USD)	2000
`overhead`	Overhead Costs(USD)	3000
`contingency_pct`	Contingency(%)	10
`subtotal`	Derived value`= labor + materials + equipment + overhead`	calculated

How It Works

How to Estimate Project Costs

Formula

Total Cost = (Labor + Materials + Equipment + Overhead) x (1 + Contingency%/100)

A contingency budget covers unexpected costs, change orders, and price fluctuations. Industry standard is 5-15% depending on project complexity and risk.

Worked Example

A remodeling project with $12,000 labor, $8,000 materials, $2,000 equipment, $3,000 overhead, and 10% contingency.

labor = 12000materials = 8000equipment = 2000overhead = 3000contingency_pct = 10

01Subtotal = $12,000 + $8,000 + $2,000 + $3,000 = $25,000
02Contingency = $25,000 x 10% = $2,500
03Total project cost = $25,000 + $2,500 = $27,500

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