How to use the cost per m² / sq ft calculator
This calculator helps you calculate a cost per unit of floor area or estimate a total from a known rate. It is intended for quantity takeoffs, early budgets and checks against a measured schedule. Start with the dimensions or quantities for one clearly defined item of work. Enter values in the units shown beside each field; millimetres and metres are not interchangeable.
The area and rate must use the same measurement basis. Enter the area in the selected unit; switching the label does not convert an existing value. No location or market benchmark is implied.
Worked example
A total cost of 240,000 for 120 m² gives 2,000 per m². Applying that same rate to 150 m² gives an estimated 300,000.
Before you order
Compare the result with your drawings and supplier information. Keep the original net quantity separate from allowances, and round purchasing quantities only at the ordering stage. Check whether delivery, labour and related materials belong elsewhere in your estimate. If the drawing or specification changes, update the inputs and record the revised basis instead of reusing an earlier total.
For the concepts behind this calculation, read Cost Plan, Unit Rate, Elemental Cost Analysis.