Material Cost Calculator
Calculate the total cost of materials for your construction projects. Add multiple items, include wastage allowance, and apply trade discounts.
How It Works
Enter your materials list with quantities and unit prices. The calculator automatically adds a wastage allowance and can apply any trade discounts.
Features
- Add multiple materials with quantities and prices
- Automatic wastage calculation (default 10%)
- Trade discount application
- Itemised breakdown with line totals
- Running totals as you add items
Typical Wastage Rates
- Tiles: 10-15% (more for complex patterns)
- Timber: 10% (cuts and defects)
- Bricks: 5-10%
- Concrete: 5% (overage for pours)
- Paint: 5-10%
UKUK Building Regulations
References & Sources
Standards Cited
- RICS NRM — RICS New Rules of Measurement (NRM 1 and NRM 2)
Provides standardised methods for measuring and pricing construction materials, including wastage allowances
Formulas Used
- Line Total:
lineTotal = quantity x unitPrice
Source: Standard accounting - Wastage Amount:
wastage = subtotal x (wastagePercent / 100)
Source: RICS NRM — Default 10% wastage is a standard industry allowance for construction materials - Discount Amount:
discount = (subtotal + wastage) x (discountPercent / 100)
Source: Standard accounting - Total Cost:
total = subtotal + wastage - discount
Source: Standard accounting - Unit Price:
unitPrice = totalCost / quantity
Source: Standard accounting
Key Assumptions
- Default 10% wastage allowance for construction materials — RICS NRM / Industry standard practice
- Discount is applied after wastage addition (on the gross amount) — Standard industry pricing convention