How many 30 kg bags of concrete do I need per cubic metre?

One 30 kg bag yields 0.012 m³ of finished concrete. To fill 1 m³, you need 83 bags. At 2026 retail prices of $8 to $11 per bag from Home Depot Canada, Rona, or BMTC, bagged concrete makes financial sense when your pour is under 1 m³. Above that, ready-mix is more cost-effective.

Concrete Calculator Canada 2026

Q: How much does concrete cost per cubic metre in Canada in 2026?

Ready-mix concrete costs $175 to $225 per m³ in Ontario, $180 to $215 per m³ in Alberta, $215 to $270 per m³ in British Columbia, and $170 to $215 per m³ in Quebec as of 2026. High-strength mixes (30 to 35 MPa) add $20 to $45 per m³. Air-entrained mixes add roughly $12 per m³. Northern provinces (NT, NU, YT) run $320 to $750 or more per m³ due to logistics.

Q: What concrete mix strength do I need for a driveway in Canada?

Canadian residential driveways require 25 MPa air-entrained concrete per CSA A23.1 standards. Air-entrainment is mandatory in all provinces with freeze-thaw cycles, which covers virtually all of Canada except parts of BC's coast. Pour at 125mm minimum thickness for a driveway that handles vehicle loads without cracking.

Q: What is the frost depth for concrete footings across Canadian provinces?

Frost depth requirements vary by province. BC coast: 0.6m. BC interior: 1.2m. Alberta: 1.2 to 1.5m. Saskatchewan and Manitoba: 1.5 to 1.8m. Ontario: 1.2 to 1.5m. Quebec: 1.5 to 1.8m. Maritimes: 1.2m. Yukon, NT, and Nunavut require geotechnical assessment for permafrost conditions.

Q: How do I calculate concrete for round Sonotube piers?

Use the formula: pi x (radius squared) x depth x quantity. For a 300mm Sonotube at 1.2m deep: pi x (0.15 squared) x 1.2 = 0.085 m³ per pier. The concrete calculator handles this automatically in Column or Pier mode. Enter the tube outer diameter, depth, and quantity.

Our free concrete cost calculator instantly tells you how much concrete you need for any Canadian project. Get your volume in cubic metres, bag count in 30 kg Canadian bags, and material cost in CAD, all based on 2026 ready-mix pricing across every province and territory. It's part of our full suite of construction calculators built for the Canadian market.

Ready-mix concrete in Canada costs $175 to $270/m³ in 2026. Select your project below, enter your dimensions, and you'll have your numbers in seconds.

Select your project

🚗

Driveway

Concrete driveway pad

🏠

Garage Floor

Attached or detached

🏚️

Basement Floor

Slab on grade

☀️

Patio / Pad

Backyard concrete pad

🚶

Sidewalk / Path

Walkways and paths

🏛️

Foundation

Strip or wall footing

🪜

Stairs / Steps

Exterior concrete steps

🪵

Deck Piers

Sonotube / post holes

🧱

Retaining Wall

Concrete retaining wall

🛖

Shed Pad

Small concrete pad

🏊

Pool Deck

Surround / coping

🏢

Commercial Slab

Warehouse / retail floor

📖 Canadian Concrete Reference Guide CSA standards · prices · frost depths · rebar

▼

Need a Full Concrete Estimate?

Busy contractors — send us your plans. We'll handle the rest.

✅ 95% Accuracy ⚡ 24–48 hr Turnaround 🇨🇦 All Canadian Provinces 📋 All CSI Divisions

Get a Free Quote →

Disclaimer: All results are estimates based on CSA A23.1 standard formulas and 2026 Canadian market data. Actual quantities and costs vary by site conditions, mix design, supplier pricing, delivery distance, and seasonal factors. Always confirm final volumes with your ready-mix supplier and obtain a written quote before ordering. Results do not replace a stamped structural design or professional cost estimate. Blaze Estimating Inc. is not liable for over- or under-ordering based on these results.

How to Use This Concrete Calculator

Pick Your Project or Shape

There are two ways to use this calculator.

"What are you building?" mode is the faster option. Pick your project type: driveway, garage floor, foundation, deck piers, retaining wall, stairs, patio, or commercial slab. The calculator automatically sets the right mix strength (MPa), recommended thickness, and air-entrainment based on CSA A23.1 standards. You just enter the dimensions.

Advanced / Shape mode gives you full control. Choose your shape (slab, footing, column, wall, stairs, post hole), enter exact measurements, and adjust every variable manually. This is the mode contractors and estimators use when they need precise numbers for a bid.

Not sure which mode to use? Start with the project picker. It handles the defaults so you don't have to.

Enter Your Dimensions

Every calculation comes down to one thing: volume. The calculator multiplies your length x width x thickness (or depth, or height, depending on the shape) to get cubic metres. That's what you order.

Enter dimensions in metric (metres / millimetres) or imperial (feet / inches) using the toggle at the top. Canada uses metric for ready-mix ordering, but most field crews still measure in feet. Both work.

Slabs and pads: Enter length and width in metres, thickness in millimetres. A standard residential driveway runs 125mm thick. A garage floor is typically 100mm.
Footings: Depth matters most here. Your footing must sit below the frost line for your province. Alberta: 1.2 to 1.5m. Ontario: 1.2 to 1.5m. Saskatchewan: up to 1.8m. The calculator includes frost depth presets by province.
Columns and piers: Enter the Sonotube diameter and depth. The calculator uses the circular cross-section formula automatically. Standard deck piers use a 200mm or 300mm tube.
Walls: Length x height x thickness. Don't forget to subtract door and window openings from your total. The calculator works from the dimensions you enter.
Stairs: Enter number of steps, rise (height per step), run (depth per step), and width. The NBC recommends 175mm rise and 280mm run for exterior stairs.

Select Your Province

Your province sets two things automatically: the 2026 ready-mix price default and the air-entrainment recommendation. Ready-mix prices vary significantly across Canada. Here's what the calculator defaults to in 2026:

Alberta: $190/m³ (Edmonton Spring 2026 market rate)
British Columbia: $235/m³ (Lower Mainland; interior BC runs higher at $230 to $270)
Ontario: $195/m³ (provincial average; GTA runs toward the top of the range)
Quebec: $190/m³
Maritimes: $205 to $220/m³
Northern Canada (NT, NU, YT): $360 to $550/m³ due to logistics

You can override the price with your actual supplier quote at any time. That number is the one that matters.

Choose Your Mix Strength (MPa)

This is where Canadian concrete differs from American specs. Canada uses MPa (megapascals) under CSA A23.1, not PSI. Your supplier will ask you for MPa when you call.

20 MPa

Sidewalks, light pathways, shed padsLowest residential grade. Not suitable for vehicle loads.

25 MPa

Standard residentialDriveways, patios, basement floors, pool decks, deck piers. Most homeowner projects land here.

30 MPa

Commercial baselineGarage floors, retaining walls, commercial slabs. Vehicle loads and long-term durability.

32 MPa

Heavy commercial and industrial flatworkWarehouse floors, commercial slabs with forklift traffic. The calculator uses this automatically for the Commercial Slab project type.

35 MPa

Structural gradeFoundation walls, load-bearing columns, footings for multi-storey buildings. Required on most engineered designs.

The calculator recommends the right MPa for your project automatically in project mode. Each strength level adds to your base price: 30 MPa adds about $20/m³, 32 MPa adds about $32/m³, and 35 MPa adds about $45/m³ over the 25 MPa baseline.

Set Your Waste Factor

The standard waste factor for concrete is 10%. That covers spillage, slight over-excavation, uneven subgrade, and the small amount left in the drum when the truck leaves. The calculator defaults here.

When to go higher:

Rocky or uneven subgrade: Use 12 to 15%. Irregular voids in the base consume more concrete than your flat-surface calculation accounts for.
Hot weather pours in Alberta or Saskatchewan: Add 5% for any summer pour over 30 minutes from the batch plant. Heat accelerates set time and you may waste the tail end of a load.
Your first pour: Just use 15%. The math is right. The execution usually isn't on the first job.

Running short mid-pour is far more expensive than over-ordering by half a cubic metre. A cold joint in a slab is a permanent weak point.

Read Your Results

The calculator gives you everything you need to make an order decision.

Volume: Net cubic metres (your dimensions only) and order volume (net + waste). This is the number you give your ready-mix supplier.
Cubic yards: The same volume converted for reference. Some older estimating databases use cubic yards. 1 m³ = 1.308 yd³.
30 kg bag count: How many bags to buy if you're mixing by hand. One bag = 0.012 m³. At $8 to $11 per bag in 2026, bagged concrete is cost-effective when your pour is under 1 m³. Above that, the time cost of mixing and the cold joint risk tip the balance toward ready-mix.
Truck loads: Your order volume divided by 8 m³ (standard drum truck capacity). Anything under 5 m³ puts you in short-load territory.
Pour time estimate: Calculated at 3.5 m³/hr, which is a standard residential pour rate with a 4-person crew.
Pump truck: The calculator flags this when your pour exceeds 4 m³ or when site access likely limits direct chute delivery. Pump truck rental runs $150 to $300/hr in Canada in 2026, billed separately from the concrete.
Material cost (CAD): Your order volume x effective price per m³, which includes the MPa adder and air-entrainment adder. This is material only. Labour, formwork, rebar, delivery surcharges, and taxes are on top.
Installed cost range: A rough total project budget at 2.5 to 4x your material cost. That multiplier covers labour, formwork, reinforcement, finishing, and contractor overhead. Use it for early-stage budgeting, not for bidding.

Concrete Volume Formulas by Shape

Every concrete calculation is a volume calculation. Here's the formula for each shape.

Slab / Pad

Length (m) x Width (m) x Thickness (m)

6m x 4m x 0.125m = 3.0 m³

Footing / Strip Foundation

Length (m) x Width (m) x Depth (m)

10m x 0.6m x 1.2m = 7.2 m³

Column / Round Pier (Sonotube)

pi x (Diameter / 2)² x Height x Qty

300mm tube, 1.5m deep, 6 piers = 0.64 m³

Wall

Length (m) x Height (m) x Thickness (m)

8m x 2.4m x 0.2m = 3.84 m³

Stairs

Cumulative step volume + landing

Volume stacks per step. The calculator handles this automatically.

Post Hole

pi x (Diameter / 2)² x Depth x Qty

200mm hole, 1.2m deep, 8 holes = 0.30 m³

Add your waste factor to every result before ordering.

Concrete Bags vs. Ready-Mix: Which One for Your Job?

You've got a small pour coming up and you're not sure whether to call the batch plant or grab bags from the store. Here's the rule.

Under 1 m³

Buy 30 kg bags. You avoid the short-load surcharge ($100 to $250), you mix on your schedule, and the cost is comparable. 1 m³ takes 83 x 30 kg bags at roughly $830 in 2026. Under 1 m³, bags win every time.

1 to 3 m³

Bags or ready-mix, your call. Most suppliers flag orders under 3 m³ as short-load. The surcharge runs $100 to $250. Weigh that against the time cost of hand-mixing 80+ bags. Most contractors take the surcharge for pours over 1 m³ just to get a uniform pour without cold joints.

Over 3 m³

Order ready-mix. Mixing bags in batches creates cold joints between loads. That's a structural problem on slabs and walls. A ready-mix truck delivers the full pour in one uniform batch, which is what CSA A23.1 assumes.

That's it. No guessing involved. The concrete cost calculator flags the short-load threshold automatically so you always know which side of the line you're on.

2026 Ready-Mix Concrete Prices by Province

These are 2026 market rates for standard residential mixes (25 MPa air-entrained), sourced from Canadian supplier pricing updated as of January and February 2026.

Province / Territory	Price Range (CAD/m³)	Calculator Default
Alberta	$180 to $215	$190
British Columbia	$215 to $270	$235
Manitoba	$185 to $220	$200
New Brunswick	$190 to $230	$205
Newfoundland	$200 to $250	$220
Nova Scotia	$190 to $230	$205
Ontario	$175 to $225	$195
Prince Edward Island	$200 to $240	$215
Quebec	$170 to $215	$190
Saskatchewan	$180 to $220	$198
Northwest Territories	$320 to $520	$400
Nunavut	$450 to $750+	$550
Yukon	$300 to $480	$360

High-strength mixes add to these base prices: 30 MPa adds ~$20/m³, 32 MPa adds ~$32/m³, 35 MPa adds ~$45/m³. Air-entrainment adds ~$12/m³.

Always confirm with your local supplier before ordering. These are market averages, not fixed prices.

CSA A23.1 Mix Strength Guide

Canada's concrete standard uses MPa, not PSI. When you call your supplier, you'll ask for 25 MPa or 30 MPa, not 3,500 PSI.

20 MPa

Minimum residential gradeSidewalks, light pathways, shed slabs. Don't use it for vehicle loads or structural applications.

25 MPa

Canadian residential standardCovers most homeowner projects: driveways, patios, basement floors, pool decks, and deck piers. In 2026, 25 MPa air-entrained costs about $195/m³ in Ontario and $190/m³ in Alberta.

30 MPa

Commercial baselineGarage floors, retaining walls, pool surrounds, and commercial flatwork. The extra 5 MPa costs about $20/m³ more and buys significantly better durability under vehicle loads and freeze-thaw cycling.

35 MPa

Structural gradeFoundation walls, load-bearing columns, and footings for multi-storey construction. Required on most engineered designs. Adds about $45/m³ over the 25 MPa base.

Air-entrainment is separate from mix strength. It's a chemical admixture that creates micro air bubbles, letting the concrete expand and contract through freeze-thaw cycles without cracking. The National Building Code requires it for all exterior concrete in Canada's freeze-thaw zones. That's basically everywhere except parts of BC's coast. It adds about $12/m³.

Frost Depth and Footing Depth by Province

Your footing must sit below the frost line. Pour it above the line and it moves with the ground through freeze-thaw cycles. That means cracked walls, shifted structures, and failed inspections.

BC Coast0.6m minimum

BC Interior1.2m

Alberta1.2 to 1.5m

Saskatchewan / Manitoba1.5 to 1.8m

Ontario1.2 to 1.5m (varies by region)

Quebec1.5 to 1.8m

Maritimes1.2m

NT / NU / YTGeotechnical assessment required

The frost depth presets in the footing and post hole inputs are set by province automatically when you select your location.

Rebar and Reinforcement Reference

Concrete handles compression well but fails in tension without reinforcement. Every structural pour needs rebar or wire mesh. Here's what Canadian residential projects typically use:

Driveways and patios10M bars at 300mm O/C in a grid pattern, or 150x150mm welded wire mesh (WWM). Mesh is faster to place. Rebar gives better crack control on larger slabs.

Garage floors10M bars at 200mm O/C, or 150x150mm WWM. Thicken the perimeter edge to 200mm for the first 300mm in from the wall.

Basement floors10M at 300mm O/C or 200x200mm WWM. Vapour barrier required beneath the slab in Canadian residential construction.

Foundation walls15M vertical bars at 200mm O/C, 15M horizontal at 300mm O/C. Engineer stamp required for anything multi-storey.

Strip footings2 to 3 x 15M bars running continuous. Add diagonal bars at corners and T-intersections.

Deck piers (Sonotubes)No rebar typically needed for standard residential deck piers under 2m deep.

Rebar costs $1.20 to $1.80 per linear metre for 10M and $1.80 to $2.50 per linear metre for 15M in Canada in 2026.

Common Concrete Calculation Mistakes

We've reviewed thousands of concrete takeoffs at Blaze Estimating. These are the mistakes that show up most often.

⚠️

Forgetting to convert unitsA thickness entered in inches treated as metres is off by a factor of 25. Always double-check your units before calculating.

⚠️

Skipping the waste factorCalculating exact volume and ordering exact volume leaves you short. Always add 10% minimum.

⚠️

Using the wrong mix strengthOrdering 20 MPa for a garage floor to save $20/m³ costs significantly more in repairs within 3 to 5 winters. Follow the CSA A23.1 table for your project type.

⚠️

Ignoring frost depthA footing above the frost line moves with the ground. In most Canadian provinces, this means failed inspections and structural damage.

⚠️

Confusing cubic metres and cubic yardsReady-mix is ordered in cubic metres in Canada. Some US-based tools use cubic yards. 1 m³ = 1.308 yd³. Getting these mixed up on a large pour is an expensive mistake.

⚠️

Not accounting for openings in wallsIf your wall has windows or doors, deduct those volumes before calculating. The calculator works from the dimensions you enter.

Point is: the math is simple. The mistakes come from rushing the inputs.

When to Call a Professional Estimator

This concrete cost calculator handles volume accurately. That's its job. But volume is only the starting point on complex projects. For full project scopes, our concrete estimating services cover everything from rebar schedules and formwork to complete CSI division breakdowns.

You need a professional estimator when:

Your project has structural elements (foundations, load-bearing walls, columns) that require an engineer's stamp and a detailed rebar schedule
You're bidding a multi-element project with different mix strengths, thicknesses, and pours at different times
Your quote needs to go out in 20-48 hours and you can't afford a calculation error
Your scope includes concrete repair or remediation alongside new pours, because those quantities are calculated differently

Need a Full Concrete Estimate?

Busy contractors, send us your plans. We'll handle the rest.

✅ 95% Accuracy ⚡ 20-48 hr Turnaround 🇨🇦 All Canadian Provinces 📋 All CSI Divisions

Get a Free Quote

Concrete Calculator FAQs

How do I calculate how much concrete I need for a slab? ▼

Multiply length x width x thickness (all in metres) to get cubic metres. For a 5m x 4m slab at 100mm (0.1m) thick: 5 x 4 x 0.1 = 2.0 m³ net. Add 10% waste to get 2.2 m³ to order. That's 183 x 30 kg bags or a short ready-mix delivery. Always confirm the thickness requirement for your project type before you calculate.

How much does concrete cost per cubic metre in Canada in 2026? ▼

Ready-mix concrete costs $175 to $225/m³ in Ontario, $180 to $215/m³ in Alberta, $215 to $270/m³ in British Columbia, and $170 to $215/m³ in Quebec as of 2026. High-strength mixes (30 to 35 MPa) add $20 to $45/m³ to those base prices. Air-entrained mixes add roughly $12/m³. Northern provinces (NT, NU, YT) run $320 to $750+/m³ due to logistics. Always get a written quote from your local supplier before committing to a budget.

How many 30 kg bags do I need per cubic metre? ▼

One 30 kg bag yields 0.012 m³ of finished concrete. To fill 1 m³, you need 83 bags. At 2026 retail prices of $8 to $11 per bag, that's $664 to $913 per cubic metre in bagged form. Compare that to $175 to $270/m³ for ready-mix. Bagged concrete makes financial sense when your pour is under 1 m³. Above that, the short-load surcharge and cold joint risk make ready-mix the better call.

What concrete mix strength do I need for a driveway in Canada? ▼

Canadian residential driveways require 25 MPa air-entrained concrete per CSA A23.1. Air-entrainment is mandatory in all provinces with freeze-thaw cycles, which covers virtually all of Canada except parts of BC's coast. Don't use 20 MPa to save $20/m³. Surface scaling shows up within 2 to 3 winters. Pour at 125mm minimum thickness for a driveway that handles vehicle loads without cracking.

What is a short-load surcharge and how do I avoid it? ▼

A short-load surcharge is a fee charged when your order falls below the supplier's minimum delivery volume, typically 3 to 5 m³. In Ontario, Dufferin Concrete charges $200 for orders of 3.25 to 4 m³ and $125 for 4.25 to 5 m³. To avoid it: combine multiple small pours into one delivery, or switch to 30 kg bags for jobs under 1 m³. The calculator flags short-load risk automatically based on your calculated volume.

What is the frost depth for footings across Canadian provinces? ▼

Frost depth determines how far below grade your footings must go. BC coast: 0.6m. BC interior: 1.2m. Alberta: 1.2 to 1.5m. Saskatchewan and Manitoba: 1.5 to 1.8m. Ontario: 1.2 to 1.5m. Quebec: 1.5 to 1.8m. Maritimes: 1.2m. Yukon, NT, and Nunavut require geotechnical assessment for permafrost. Your local building authority sets the binding minimum. Confirm before you pour.

How do I calculate concrete for round Sonotube piers? ▼

Use the formula: pi x (radius)² x depth x quantity. For a 300mm (12") Sonotube at 1.2m deep: pi x (0.15)² x 1.2 = 0.085 m³ per pier. For 8 piers, that's 0.68 m³ total. Add 10% waste: 0.75 m³ to order, or about 63 x 30 kg bags. The calculator handles this automatically in Column / Pier mode. Enter the tube outer diameter, depth, and quantity.

Can I pour concrete in winter in Canada? ▼

Yes, with proper precautions. CSA A23.1 defines cold weather concreting as any period when ambient temperature is below +5°C during or within 24 hours of the pour. Requirements include heated mixing water or aggregates, insulated formwork, extended curing under insulated blankets, and a minimum concrete temperature of +10°C at delivery. Many suppliers charge a winter heating surcharge of $15 to $25/m³. Never pour directly onto frozen ground without a layer of insulation beneath the formwork.

How accurate is an online concrete calculator? ▼

Volume calculations are highly accurate when your dimensions are correct. It's simple geometry — length times width times depth. Where accuracy breaks down is in waste estimation (real site conditions vary), mix pricing (local supplier prices differ from regional averages), and reinforcement (not included in basic volume tools). Our concrete cost calculator defaults use verified 2026 Canadian supplier data, but always confirm the price with your supplier and the volume with a professional estimator for any project over $5,000.