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Mortar Quantity Calculator

Calculate mortar quantity with cement & sand ratios for brickwork, plastering & tiling applications. Mix ratios from 1:3 to 1:6. Free construction estimator.

Mortar Quantity Calculator

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Calculate mortar quantities for brickwork and blockwork. Supports multiple mix ratios with cement and sand breakdown. Free construction calculator.

Mortar Quantity Calculator
Inputs
Range: 5-12% (typical 5-12%)
Formulas Used
Volume with Waste = Mortar Volume × (1 + Waste Factor)
Dry Volume = Volume with Waste × 1.54
Cement Volume = (Dry Volume × Cement Ratio) / Total Ratio
Sand Volume = (Dry Volume × Sand Ratio) / Total Ratio
Cement Weight = Cement Volume × Cement Density
Sand Weight = Sand Volume × Sand Density
Cement Bags = Ceiling(Cement Weight / Bag Size)
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Enter values in the calculator to see your results
Enter mortar volume, select mix ratio, and configure waste factor to calculate cement and sand quantities.
Tip: This calculator provides estimates for planning purposes. Always order 5-10% extra for waste.

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Mortar Quantity Calculator -- Complete Guide

Calculate cement, sand, and water volumes for brickwork, blockwork, plastering, and tiling mortar using IS, BS, and ASTM mix specifications.

1:6
Standard masonry mortar ratio
0.30 m³
Mortar per m³ brickwork
10 mm
Standard joint thickness
1.35×
Dry to wet volume factor

How to Calculate Mortar Quantities

Mortar is the bonding agent between masonry units. It fills joints, transfers loads uniformly, and provides weathertightness. Quantity estimation starts with the volume of mortar joints in the finished work. For standard brickwork: joint volume ≈ 30% of the gross wall volume.

The key step is applying the dry-to-wet volume factor (1.35): mortar shrinks when mixed because water fills the void space between dry particles. So 1 m³ of dry mix ingredients becomes ≈ 0.74 m³ of wet mortar. To get 1 m³ of mortar, you need 1.35 m³ of dry ingredients.

Mix ratios (cement : sand by volume) determine ingredient quantities. A 1:6 mix has 7 total parts: cement volume = 1/7 × 1.35 = 0.193 m³ per m³ of mortar needed. Sand = 6/7 × 1.35 = 1.157 m³. Convert cement volume to bags: 0.193 ÷ 0.0347 = 5.6 bags per m³ of mortar.

Mortar Volume in Masonry

✔Brickwork (230×115×75): ≈30% joints
✔Blockwork (400×200×200): ≈10–12% joints
✔Pointing mortar: 2–5 mm rebuild
✔Plastering (12 mm coat): 0.012 m³/m²
✔Tiling (3 mm bed): 0.003 m³/m²
✔Floor screed (50 mm): 0.05 m³/m²

Mortar Quantity Formulas

Mortar Volume in Brickwork
V_mortar = V_wall x 0.30

Standard 230×115×75 mm bricks with 10 mm joints: joint volume ≈ 30% of gross wall volume. Adjust for actual brick size and joint thickness.

Dry Ingredient Volume
V_dry = V_mortar x 1.35

The dry-to-wet factor 1.35 accounts for air voids between dry particles that collapse when water is added and mix is worked.

Cement Volume per m^3 Mortar
V_c = [1/(1+n)] x 1.35

n = sand parts. For 1:6: V_c = (1/7)×1.35 = 0.193 m³. Convert to bags: ÷ 0.0347 m³/bag = 5.56 bags per m³.

Sand Volume per m^3 Mortar
V_s = [n/(1+n)] x 1.35

For 1:6: V_s = (6/7)×1.35 = 1.157 m³. Convert to weight: × 1500 kg/m³ (loose) = 1736 kg per m³ of mortar.

Mortar Types — Mix Ratios & Applications

Mix Ratio (C:S)IS DesignationCompressive StrengthApplicationNotes
1:3MM 10 (strong)≥10 N/mm²RCC precast joints, groutHigh cement; prone to cracking
1:4MM 5≥5 N/mm²External plaster, DPC courseGood strength + workability
1:5MM 3≥3 N/mm²Internal plaster, brick copingBalanced mix
1:6MM 1.5≥1.5 N/mm²Internal brickwork, masonryMost common masonry mortar
1:8Lean mix< 1 N/mm²Filling, non-structuralNot for load-bearing walls
Lime + cementFL typeVariesRepointing heritage masonryMore flexible, breathable

History of Mortar

10,000 BC

Earliest known use of mud mortar in Mesopotamia to bond sun-dried mud bricks. Some of the world's oldest structures in Jericho used lime-burned plaster as a floor finish — among the first processed binding materials.

3000 BC

Egyptians used gypsum mortar (calcined from calcium sulphate) in the construction of the pyramids. The joints in the Great Pyramid are remarkably fine — 0.5 mm in places — requiring a highly fluid, precisely proportioned mortar.

300 BC

Romans developed hydraulic lime mortar (opus signinum) and later pozzolanic mortar using volcanic ash from Pozzuoli, Italy. This mortar hardened underwater — revolutionary for harbour and bridge construction.

1824

Joseph Aspdin patented Portland cement, quickly replacing pure lime mortars in structural applications. Portland cement mortars are much stronger and faster-setting but less flexible than pure lime mortars.

1950s

Plasticiser admixtures introduced to improve mortar workability without increasing water content. Ready-mixed mortar (factory-batched dry mix or wet retarded mix) became available, improving site consistency.

2000s+

Polymer-modified mortars (tile adhesives, repair mortars, self-levelling screeds) now widely used. Dry premix mortars dominate residential tiling and flooring. High-bond epoxy grouts used in chemical-resistant tiling.

Standards & Research

IS Code

IS 2250:1981 — Masonry Mortars

Indian Standard code of practice for preparation and use of masonry mortars including mix designation, constituent materials, workmanship, and curing requirements.

Read source →
EN Standard

BS EN 998-2 — Masonry Mortar

European standard specifying mortar for masonry including compressive strength classes M1–M20, water retention, and durability requirements for factory and site-mixed mortars.

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ASTM Standard

ASTM C270 — Mortar for Masonry

US standard specifying Types M, S, N, O, K mortar by proportions and properties including compressive strength, water retention, and air content limits.

Read source →

Mortar Myths vs Facts

Myth

More cement in mortar makes stronger masonry walls

Fact

Over-rich mortar (1:3) is stronger than the brick/block units and transfers cracks into the units rather than the joints. IS 2250 recommends 1:6 for internal brickwork — mortar should be weaker than the unit so cracks appear in repairable joints, not through the masonry.

Myth

1 m³ dry materials = 1 m³ of mortar

Fact

Due to the dry-to-wet volume factor (1.35), 1.35 m³ of dry ingredients is needed to produce 1 m³ of mixed mortar. Ignoring this leads to ordering 35% too little material, causing work stoppages.

Myth

Any sand can be used for mortar

Fact

IS 2116 specifies fine aggregate for masonry mortars: clean, well-graded sand with <4% clay and silt. Dirty or salty sand causes efflorescence, reduces adhesion, and leads to joint failure. Sea sand must never be used without washing.

Myth

Mortar can be retempered (adding water) after it starts to stiffen

Fact

Retempered mortar has reduced bond strength due to partial hydration of cement. IS 2250 mandates using mortar within 30 minutes of mixing for ordinary Portland cement mortars. Retarded ready-mix mortars are specifically designed for extended working times.

Frequently Asked Questions

How much mortar do I need per m² of brickwork?▾
Standard brickwork (230×115×75 mm bricks, 10 mm joints): mortar ≈ 0.030 m³/m² for a half-brick wall (115 mm thick). Double for a full-brick wall. Using 1:6 mix: cement ≈ 0.83 bags/m², sand ≈ 0.045 m³/m² per half-brick leaf.
What is the difference between mortar and concrete?▾
Mortar = cement + sand + water (no coarse aggregate). Used for joints, plastering, tiling. Concrete = cement + sand + coarse aggregate + water. Used for structural elements. Grout = cement + water (or + fine sand) for filling narrow gaps and post-tensioning ducts.
Why does mortar need more dry volume than wet mortar volume?▾
Dry particles have significant voids between them. When water is added and the mix is worked, particles re-arrange to fill voids, reducing the total volume. Factor of 1.35 means you need 35% more dry ingredients than the final wet mortar volume.
How much mortar is needed for 1000 bricks?▾
Standard 230×115×75 mm bricks with 10 mm joints: 0.03 m³ mortar per m² half-brick wall. Area of 1000 bricks ≈ 11.9 m². Mortar = 11.9 × 0.03 = 0.36 m³. Using 1:6 mix: ≈2.0 cement bags, 0.42 m³ sand.
Can I use builder's sand (soft sand) instead of sharp sand for mortar?▾
Builder's sand (soft/fine sand) is correct for masonry mortar and plaster. Sharp sand (coarse, gritty) is used for concrete and floor screeds. Using sharp sand in pointing mortar gives poor workability and weak bond. Use Zone II or III sand per IS 383 for mortar.
What is the water-cement ratio for mortar?▾
Typically 0.40–0.55 by weight depending on consistency required. For masonry mortar (1:6): adding 0.45 kg water per kg cement gives a workable mix. Do not add water to the limit of workability — excess water reduces strength and causes shrinkage cracking.
How do I calculate mortar for a plastered wall?▾
For a 12 mm thick plaster coat on 10 m² wall: Volume = 10 × 0.012 = 0.12 m³ wet plaster. Dry volume = 0.12 × 1.35 = 0.162 m³. For 1:6 mix: cement = (1/7)×0.162 ÷ 0.0347 = 0.67 bags; sand = (6/7)×0.162 = 0.139 m³.
How long does it take for mortar to cure?▾
Ordinary Portland cement mortar: initial set 2–4 hours, usable strength 24–48 hours, 70% strength at 7 days, 99% at 28 days. Protect from rain for 24 hours and from frost for 72 hours. Do not load brickwork for 7 days minimum (IS 2250).
What is repointing and when is it needed?▾
Repointing is the process of raking out deteriorated mortar joints to 15–25 mm depth and replacing with fresh mortar. Needed when: joints are cracked, friable, or absent; mortar recessed > 5 mm from face; water penetration through pointing. Heritage buildings require lime mortar for repointing, not Portland cement.
How do I calculate tile adhesive mortar for a floor?▾
Standard ceramic tile with 3–4 mm adhesive bed: 0.003–0.004 m³ per m². Using 1:3 tile bedding mix: cement = (1/4)×0.004×1.35 ÷ 0.0347 = 0.039 bags/m². Or use proprietary thin-set adhesive at manufacturer's rate (typically 3–5 kg/m² per mm bed depth).
What is dry pack mortar and when is it used?▾
Dry pack mortar is a stiff, low-water-content mix (consistency of damp sand) packed under bearing plates, column bases, and machine foundations. Very low w/c ratio (≈0.25–0.30) gives high compressive strength (≥30 MPa). Used where precise levelling and high bearing strength are needed in thin (< 50 mm) sections.
How much does adding lime to mortar affect quantities?▾
Lime-modified mortars (cement:lime:sand = 1:1:6) use less cement but similar total mix volume. Lime improves workability and flexibility. For 1:1:6 mix: total parts = 8. Cement bags per m³ mortar = (1/8)×1.35 ÷ 0.0347 = 4.86 bags. Sand = (6/8)×1.35 = 1.01 m³/m³ mortar.

References

  • IS 2250:1981 — Code of Practice for Preparation and Use of Masonry Mortars, BIS
  • IS 2116:1980 — Sand for Masonry Mortars — Specification, BIS
  • ASTM C270 — Standard Specification for Mortar for Unit Masonry
  • BS EN 998-2:2016 — Specification for Mortar for Masonry — Masonry Mortar
  • Shetty, M.S. (2005) — Concrete Technology, S. Chand (Chapter on Masonry Mortars)
  • The Brick Development Association — BDA Guide to Successful Brickwork, 4th Ed.

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