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Calcimator

Change Order Impact Calculator

Calculate the full cost impact of a construction change order including markup, schedule delay costs, and new contract value.

Inputs

$
$
days
%

Results

New Contract Value

$2,093,750.00

≈ 5 average U.S. homes

Total Impact

$96,750.00

≈ 9 years of state college

Markup Amount$18,750.00
Schedule Impact Cost$3,000.00
Change as % of Contract4.7%
How to Use This Calculator
  1. Enter the current contract value before this change order.
  2. Enter the direct cost of the change in dollars (positive for additions, negative for deductions).
  3. Enter the schedule impact in calendar days the change adds to the project.
  4. Set the overhead and profit rate as a percentage to apply markup to the change amount.
  5. Read the new contract value, markup amount, schedule impact cost, and total change order impact.

How the result changes with Original Contract Value

Original Contract ValueNew Contract ValueTotal Impact
$10,009,000.00$10,102,750.00$108,763.50
$35,006,500.00$35,100,250.00$146,259.75
$65,003,500.00$65,097,250.00$191,255.25
$90,001,000.00$90,094,750.00$228,751.50

What each input means

Original Contract Value
Current contract value before this change order.
Change Amount
Direct cost of the change (positive for additions, negative for deductions).
Schedule Impact
Additional calendar days the change adds to the project schedule.
Overhead & Profit Rate
Combined overhead percentage applied to the change amount.

What each result means

New Contract Value
Updated contract value including the change order.
Markup Amount
Overhead and profit applied to the change.
Schedule Impact Cost
Extended general conditions cost from schedule delay.
Total Impact
Combined cost of change, markup, and schedule impact.
Change as % of Contract
This change order as a percentage of the original contract.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Original Contract Value = 2000000, Change Amount = 75000, Schedule Impact = 10, Overhead & Profit Rate = 15 = 4 input(s) provided
  2. Calculate New Contract Value
    New Contract Value
    2093750 = $2,093,750
  3. Calculate Total Impact
    Total Impact
    96750 = $96,750
  4. Calculate Markup Amount
    Markup Amount
    18750 = $18,750
  5. Calculate Schedule Impact Cost
    Schedule Impact Cost
    3000 = $3,000

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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