Free construction calculators

Check the commercial position before the problem gets expensive.

Use these free residential construction calculators to check margin, cost to complete, contingency and variation impact using your current project figures.

No account requiredAustralian dollar formatBuilt around residential construction

Construction margin & forecast position

Compare the margin built into your current budget with the margin your latest forecast is actually heading toward.

Current contract valueInclude approved client variations already added to the contract value.Current builder budgetUse the current adjusted cost budget for the project.Forecast final costYour latest expected total project cost at completion.Target margin %Enter the margin you want to achieve as a percentage of contract revenue.

Your result

Budget margin

$125,340

Budget margin %

14.3%

Forecast margin

$33,890

Forecast margin %

3.9%

Margin erosion from budget

$91,450

Gap to target margin

$53,614

Forecast risk

Moderate

How it is calculated: Margin = contract value minus cost. Margin % is measured against current contract value. Margin erosion shows how much forecast margin has moved away from the budget position.

Use the result as a commercial check, not a substitute for the project records.

The quality of the result depends on the figures entered. Keep actual costs, outstanding commitments, variation values and remaining allowances current so the forecast reflects the job as it stands today.

Read the builder guides

Need the whole project position?

BuilderForecast keeps the calculation moving with the job.

Connect budgets, variations, materials, subcontract commitments, actual costs and cost-to-complete in one project forecast, then turn the result into a clear financial report.

Start 7-day free trial