Material Calculators

Estimate quantities and material costs for your projects. Built for tradies who need accurate material estimates to avoid under-ordering, reduce waste, and quote confidently.

Material Tools

Which Calculator Should I Use?

I want to…	Use this calculator
Estimate roofing material quantities	Roofing Materials Calculator
Calculate gravel volume and weight	Gravel Calculator
Estimate gravel for a driveway	Driveway Gravel Calculator
Work out how many drywall sheets I need	Drywall Calculator
Calculate bricks for a retaining wall	Retaining Wall Brick Calculator

Who These Material Tools Are For

Builders & Contractors — calculate exact material quantities for quotes and orders
Renovators — avoid costly mistakes when ordering tiles, timber, or concrete
DIY Homeowners — get accurate estimates before heading to the supplier
Suppliers & Yards — help customers order the right quantities the first time

How to Use These Calculators for a Real Job

Measure the area you’re covering — length × width for square meters.
Choose the right calculator for your material type.
Add waste — always include a waste percentage for cuts, breakage, and mistakes.
Check pack sizes — materials often come in minimum quantities, round up to the nearest full pack.
Double-check your order quantity before submitting to the supplier.

💡 Pro Tips from Tradies

Always add waste before ordering — calculate area, add waste percentage, then multiply by material cost. Doing it backwards leads to under-ordering.
Waste factors vary by material — flooring: 10% straight lay, 15–20% diagonal; tiles: 10–15%; timber: 10–15%; paint: 10% for touch-ups.
Check supplier pack sizes — materials often come in minimum quantities or pack sizes. Round up to the nearest full pack.
Account for pattern matching — tiles, timber, and wallpaper with patterns need extra waste for matching repeats (15–25%).
Measure twice, order once — double-check all measurements before placing the order. Mistakes are expensive.

Material-Specific Quick Tips

Tiles & Stone

Add 10–15% waste for cuts and breakage
For pattern matching, add 20–25%
Check if tiles are sold by box or individually
Keep spare tiles for future repairs

Timber & Flooring

Add 10–15% waste for cutting and grading
Account for board width — wider boards need more waste
Order 5–10% extra for hidden defects

Concrete & Aggregates

Add 5–10% for spillage and uneven ground
Order slightly more — topping up a concrete truck is expensive
Use the Concrete Volume Calculator for volume estimates

Paint & Coatings

One litre covers roughly 10–12m² for one coat
Add 10% for touch-ups and mistakes
Darker colours may need more coats
Use the Paint Coverage Calculator for exact numbers

Common Material Calculation Questions

How much waste factor should I add?

Waste factor depends on the material and job complexity. Tiles: 10% straight lay, 15% diagonal. Flooring: 10% straight, 15–20% patterns. Paint: 10%. Concrete: 5–10%. Timber framing: 15–20% for cuts and offcuts.

What’s the difference between linear meters and square meters?

Square meters (m²) measure area — used for flooring, tiling, paint. Linear meters (m) measure length — used for timber, skirting boards, pipes. Know which one your supplier uses before ordering.

How do I estimate material cost for a quote?

Calculate total quantity (including waste) × price per unit, then add supplier delivery fees. Then add your markup — typically 15–30% — for profit.

Should I mark up materials when quoting?

Yes — most tradies add 15–30% markup on materials. You’re sourcing, handling, storing, and warrantying them. It’s standard industry practice.

Why Getting Material Quantities Right Matters

Under-order and you delay the job waiting for more stock. Over-order and you waste money and storage space. Accurate material estimates help you:

Avoid project delays from running out of materials mid-job
Reduce waste and protect your profit margin
Quote accurately and look professional to clients
Order confidently from suppliers the first time