Change Order Calculator

Add the extra labor, materials, and equipment for a change, apply markup to those added costs, then apply the entered sales tax to added materials. The result shows a clear change amount and revised contract total. Calculate it clearly with Figur.

How the change order calculator works

Add the extra labor, materials, and equipment for a change, apply markup to those added costs, then apply the entered sales tax to added materials. The result shows a clear change amount and revised contract total.

Method and assumptions

Figur combines the costs, percentages, and payments you enter using direct arithmetic to show a job-price, labor-cost, or construction-invoice estimate. Everything is calculated locally in your browser.

  • Overhead, contingency, labor burden, markup, and retainage percentages are applied in the exact order shown in the breakdown.
  • When sales tax is requested, this planning version applies it only to the material amount you enter.
  • The progress invoice uses earned work to date, calculates retainage on that total, and then subtracts all prior payments.
  • Actual costs can change with site conditions, subcontractors, waste, scheduling, contract terms, and local rules.

This tool provides planning estimates, not a binding bid, invoice, legal advice, tax advice, or accounting advice. Confirm taxes, retainage, and contract requirements with the applicable documents and qualified professionals.

Sources and references

No external data source is required: this calculator applies the rates, costs, and contract terms you enter.

Worked example

A $50,000 contract adds $1,200 labor, $800 materials, $200 equipment, 20% markup, and 7.25% tax on materials.

The revised contract total is $52,698.00.

Frequently asked questions

Does the change order include the original contract?

Yes. Enter the current contract total and the calculator adds the fully priced change order to show the revised contract amount.

Is tax applied to labor or markup?

No. This planning formula applies your entered tax rate to added materials only. Local rules and contract terms may require a different approach.

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