BOQ Calculator
What is a BOQ Calculator?
What is BOQ?
The BOQ Calculator computes total financial value for construction work items by multiplying surveyed physical takeoff quantities by agreed unit contract rates.
Formula
Line Item Amount ($) = Measured Quantity × Approved Unit Rate ($/Unit)
Total BOQ Value ($) = Sum of All Line Item Amounts
Variables Explanation
- Measured Quantity: Physical quantity from drawing takeoff (m³, m², tons, meters).
- Unit Rate: All-inclusive rate covering material, labor, equipment, overheads, and profit.
How to Calculate
1. Enter BOQ line item description and unit of measurement.
2. Input measured takeoff quantity.
3. Input agreed contract unit rate.
4. View line item total amount and cumulative BOQ summary.
Worked Example
Item 1 (Earthwork Excavation): 1,500 m³ @ $12/m³ = $18,000.
Item 2 (RCC Footings M25): 250 m³ @ $180/m³ = $45,000.
Item 3 (TMT Steel Reinforcement): 30 Tons @ $950/Ton = $28,500.
Total BOQ Amount = 18,000 + 45,000 + 28,500 = $91,500.
Practical Construction & Project Controls Use
Tender price bidding, interim contractor progress payment applications, variation order valuation, and final account closing.
Understanding the Result
Outputs exact line item expenditure, allowing cost controllers to audit line item variances against original baseline tenders.
Limitations & Assumptions
Calculates direct item multiplication. Does not automatically add un-priced provisional sums or daywork rates unless entered.
Frequently Asked Questions
What is a Bill of Quantities (BOQ) in construction?
A BOQ is a detailed tender document listing all work items, quantities, units, and rates required to complete a project.
What is the difference between a BOQ and a Cost Estimate?
A BOQ is based on firm measured drawing quantities used for binding contracts; a cost estimate is a preliminary budget calculation.
What items are included in an all-inclusive unit rate in a BOQ?
A unit rate includes direct material, labor, plant equipment, site overheads, transport, taxes, and contractor profit.
How are variation orders priced using a BOQ?
Variations use existing BOQ unit rates if the work is similar; new star rates are negotiated if conditions differ significantly.
What does "provisional quantity" mean in a BOQ?
A provisional quantity is an estimated scope figure subject to re-measurement on site after work completion.