BOQ Calculator
What is a Boq Calculator?
A Bill of Quantities (BOQ) is an itemised list of the work and materials in a construction project, each with a description, unit, quantity, rate and amount. Contractors price tenders with it, clients compare bids line by line, and quantity surveyors use it to value work completed for interim payments.
How to use the calculator
- Add a line for each item, for example PCC 1:4:8 in foundation, with its unit such as m³, m², kg or nos.
- Enter the measured quantity and the unit rate.
- The tool multiplies quantity by rate for each line and adds up the total, which you can copy into your estimate.
Worked example
| Item | Unit | Qty | Rate | Amount |
|---|---|---|---|---|
| Earthwork excavation | m³ | 120 | 350 | 42,000 |
| PCC 1:4:8 | m³ | 8 | 5,200 | 41,600 |
| RCC M25 footing | m³ | 18 | 7,800 | 140,400 |
| Reinforcement steel | kg | 1,450 | 72 | 104,400 |
The total for these four items is 328,400. Contingencies and taxes are usually added as separate percentage lines after the subtotal.
Tips for a reliable BOQ
- Follow a measurement standard, such as IS 1200, SMM7 / NRM2 or CESMM, so quantities are measured consistently and disputes are avoided.
- Keep descriptions specific. Grade of concrete, thickness, finish and inclusions change the rate.
- Separate labour-only and material-inclusive rates clearly.
- Track revisions. Variations should be added as new lines rather than editing the original quantities.
Frequently Asked Questions
What is a BOQ in construction?
A Bill of Quantities is an itemised list of work items with units, quantities, rates and amounts, used for tendering, cost control and payments.
Who prepares the BOQ?
Usually a quantity surveyor or cost engineer, based on the drawings and specifications.
How is the amount for each line calculated?
Amount equals quantity multiplied by the unit rate. The project total is the sum of all line amounts plus any percentage items.
Is a BOQ the same as an estimate?
A BOQ lists quantities and rates in a standard structure. An estimate may be rougher, for example cost per square metre, and is often prepared before detailed quantities exist.