Mortar Quantity Calculator

CalculatorApp.me

Mortar Quantity Calculator

No Intrusive AdsAI-Powered

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

Mortar Quantity Calculator

Inputs

Mortar Volume (m³) *

Mix Ratio (Cement:Sand)

Waste Factor (%) *

Range: 5-12% (typical 5-12%)

Cement Bag Size (kg)

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)

🧱

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.

Want to learn more? Browse our calculation guides and tutorials →

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 Designation	Compressive Strength	Application	Notes
1:3	MM 10 (strong)	≥10 N/mm²	RCC precast joints, grout	High cement; prone to cracking
1:4	MM 5	≥5 N/mm²	External plaster, DPC course	Good strength + workability
1:5	MM 3	≥3 N/mm²	Internal plaster, brick coping	Balanced mix
1:6	MM 1.5	≥1.5 N/mm²	Internal brickwork, masonry	Most common masonry mortar
1:8	Lean mix	< 1 N/mm²	Filling, non-structural	Not for load-bearing walls
Lime + cement	FL type	Varies	Repointing heritage masonry	More 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.

Read source →

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.

Related Calculators

Brick & Block Calculator Plaster Quantity Calc Concrete Quantity Calc Tile Quantity Calculator Concrete Calculator Paint Coverage Calculator

Order Exactly the Right Amount of Mortar

Never run short on site — calculate cement, sand, and water before you mix.

All Construction Calculators Brick & Block Calculator

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.

Methodology, sources & limitations

This calculator uses a published formula and the values entered in the calculator to generate the result.

Formula: Mortar Volume = Number of Joints × Joint Volume
Jurisdiction & units: Intended for US, IN, EU, GB, AU. Supports both units where applicable.
Assumptions & limitations: Results are preliminary estimates based on the inputs you provide. Confirm material properties, loads, local codes, and final designs with a qualified professional.
Review status: Formula and automated QA completed June 21, 2026; independent professional review is pending. Next scheduled review: September 21, 2026.

Validation sources

ASTM C270

Mortar Quantity Calculator — Answer & Method

Calculate mortar volume and material quantities for masonry work.

Formula: Mortar Quantity

Mortar Volume = Number of Joints × Joint Volume

- = See calculator (various)

Example Calculation

Use the Mortar Quantity Calculator for accurate calculations.

Important limitation

Use this as a preliminary estimate and verify project-specific inputs, codes, and designs with a qualified professional.

Key Facts

Type S mortar (1:0.5:4.5 cement:lime:sand) is standard for structural masonry.

Sources & Validation

ASTM C270

Related Calculators

Brick & Block Calculator Plaster Quantity Calculator

Deterministic: YesAI-Generated Numbers: NoVerified: 2026-02-12

Want to learn more? Browse our calculation guides and tutorials →

Mortar Quantity Calculator

Mortar Quantity Calculator -- Complete Guide

How to Calculate Mortar Quantities

Mortar Volume in Masonry

Mortar Quantity Formulas

Mortar Types — Mix Ratios & Applications

History of Mortar

Standards & Research

IS 2250:1981 — Masonry Mortars

BS EN 998-2 — Masonry Mortar

ASTM C270 — Mortar for Masonry

Mortar Myths vs Facts

Frequently Asked Questions

References

Related Calculators

Order Exactly the Right Amount of Mortar

Mortar Quantity Calculator

Methodology, sources & limitations

Validation sources

Mortar Quantity Calculator — Answer & Method

Formula: Mortar Quantity

Example Calculation

Important limitation

Key Facts

Sources & Validation

Related Calculators

See Also

Brick & Block Calculator

Plaster Quantity Calculator

Concrete Quantity Calculator

Tile Quantity Calculator

Mortar Quantity Calculator

Mortar Quantity Calculator -- Complete Guide

How to Calculate Mortar Quantities

Mortar Volume in Masonry

Mortar Quantity Formulas

Mortar Types — Mix Ratios & Applications

History of Mortar

Standards & Research

IS 2250:1981 — Masonry Mortars

BS EN 998-2 — Masonry Mortar

ASTM C270 — Mortar for Masonry

Mortar Myths vs Facts

Frequently Asked Questions

References

Related Calculators

Order Exactly the Right Amount of Mortar