Mortar Calculator
Plan your mortar project with precision. Enter wall area dimensions, choose mortar type and joint thickness, account for waste, and estimate bags, yield, bricks covered, blocks covered, and total project cost.
One square foot of brick wall needs about 0.20 cubic feet of mortar with 3/8″ joints. An 80-lb bag of premix yields ~0.6 cu ft and covers roughly 30–40 brick or 12 standard 8×8×16 blocks. For 100 modular brick, plan on 2.5–3 bags. Choose Type N (750 psi) above grade, Type S (1800 psi) below grade, and Type M (2500 psi) for heavy loads or stone. Add a 10–15% waste buffer for spillage and joint variation.
Medium strength 750 psi. Density: 2700 lb/cu yd. Recommended joint: 3/8″.
⚙️ Advanced Options (Density, Mix Design, Delivery, Pricing)
What This Calculator Does
This Mortar Calculator helps you estimate exactly how much mortar you need for brick walls, block walls, stone veneer, repointing, tuckpointing, chimneys, retaining walls, fireplaces, pavers, tile, stucco, and parging projects. It calculates volume in cubic feet and cubic yards, converts to 80-lb bag counts, provides pallet quantities, and estimates bricks and blocks covered.
The calculation features automatic mix design adjustment based on the selected mortar type—from Type N, S, M, O, and K to premix, thinset, refractory, polymer-modified, repointing, and stucco mortar. It also outputs detailed cost breakdowns including material, reinforcement, additives, delivery, and labor.
How to Use the Mortar Calculator
- Select your preferred measurement system (Imperial feet or Metric meters) and target mortar type. Selecting a mortar type automatically adjusts density, mix design, and joint thickness.
- Choose your application (brick wall, block wall, stone veneer, repointing, etc.) — this auto-suggests an appropriate joint thickness and waste margin.
- Select the project shape (rectangular, circular, triangular, trapezoid, or trench) and enter the corresponding dimensions.
- Optionally use a project template to auto-fill dimensions for common projects like a brick wall, block foundation, or chimney.
- Add deductions for openings, control joints, lintels, and vents to avoid over-purchasing.
- Configure optional add-ons like reinforcement, bonding agent, plasticizer, wall ties, and pigment.
- Optionally enter pricing for mortar, reinforcement, additives, and labor to generate a complete financial estimate.
- Adjust the waste slider to configure your safety margin, then click Calculate Mortar Needed.
Mortar Type Reference Chart
| Mortar Type | PSI | Best Use | Joint Thickness | Coverage (sq ft/bag @ 3/8″) |
|---|---|---|---|---|
| Type N | 750 | Above-grade brick/block | 3/8″ | ~30–40 brick |
| Type S | 1800 | Below-grade, foundations | 3/8″ | ~25–35 brick |
| Type M | 2500 | Heavy loads, stone | 3/8″ | ~20–30 brick |
| Type O | 350 | Interior, historic | 3/8″ | ~30–40 brick |
| Type K | 75 | Historic restoration | 3/8″ | ~30–40 brick |
| Premix (80-lb) | ~750 | General bagged use | 3/8″ | ~30–35 brick |
| Thinset | ~500 | Tile installation | 3/16″ notch | ~50 sq ft/bag |
| Refractory | ~1000 | Fireplace, chimney | 1/4″ | ~20–25 brick |
| Polymer-Modified | ~800 | Exterior tile, flexible | 3/16″ notch | ~45 sq ft/bag |
| Repointing | ~350 | Restoration joints | 1/2″ | ~20–25 brick |
| Stucco Base | ~750 | Scratch + brown coat | 1/2″ | ~15 sq ft/bag |
Common Mortar Questions
How much mortar do I need per square foot of brick wall?
How many bags of mortar per 100 bricks?
What is the difference between Type N, S, M, and O mortar?
How much mortar for a block wall?
How long does mixed mortar last?
Should I buy bagged or bulk mortar?
Pro Tips for Mortar Work
- Mix small batches — only mix what you can use within 2 hours (30–60 min in hot weather).
- Retemper only once — small water additions are allowed once, but don’t retemper mortar that has begun to set.
- Cover work in heat — use wet burlap or plastic sheeting to slow moisture loss in hot/dry conditions.
- Cold weather curing — keep mortar above 40°F for 48 hours; use accelerators or heated water in winter.
- Tool joints at the right time — joint tooling should be done when mortar is “thumbprint hard” (firm but not dry).
- Use bonding agents — for parging, stucco, or over cured concrete, use a bonding agent (SBR latex) for adhesion.
- Color consistency — when using pigment, pre-blend dry materials thoroughly before adding water to ensure uniform color.
- Full-bed vs face-shell bedding — for structural CMU walls, always use full-bed mortar; for veneers, face-shell is acceptable.
Complete Guide to Mortar Estimation & Costs
Mortar is the binding agent that holds brick, block, and stone together. From masonry walls and chimneys to tile floors and stucco finishes, mortar projects come in all shapes and sizes. Estimating the right amount of mortar ensures you don’t run short mid-project or over-pay for unused material.
Understanding Mortar Types (N, S, M, O, K, Premix, Thinset, Refractory)
Each mortar type has unique properties that affect its performance. Type N is general above-grade. Type S is high-strength for below-grade. Type M is highest strength for heavy loads. Type O is low-strength for historic repointing. Type K is very low-strength for restoration only. Premix is bagged and ready to mix. Thinset is for tile. Refractory is for high-temp fireplaces.
Joint Thickness Guidelines (By Application)
Joint thickness varies by application. Brick walls use 3/8″ joints. Block walls use 3/8″ joints. Stone veneer uses 1/2″ joints. Repointing uses 1/2″ joints. Tuckpointing uses 3/8″ joints. Fireplaces use 1/4″ joints. Tile thinset uses 3/16″ notches. Always check local building codes and manufacturer recommendations.
Bagged vs Bulk Mortar: When to Use Each
Bagged mortar is the most convenient option for projects under 50 bags, costing $8–12 per 80-lb bag. Bulk silo delivery costs $120–180 per cu yd (about $5–7 per bag equivalent) but requires a larger order (100+ bags) and a silo on-site.
Hidden Costs in Mortar Projects
Beyond the mortar itself, budget for delivery fees ($50–150), minimum order surcharges, mixing equipment rental ($100–200/day), scaffolding rental ($100–300), reinforcement ($1–3/LF), bonding agents ($5–15/oz), pigment ($3–8/lb), and labor ($75–150/hr for a mason). Our calculator includes all these optional cost fields.