SOMA CEA — Construction Material App

🧱 Concrete Material Calculator

Material requirements per m³ of finished concrete. Assumes 30% shrinkage, 5% wastage. Mechanical mix water/cement = 0.4–0.5.

Inputs

Concrete class

Volume (m³)

Reference table — all classes

Class	Mix type	Ratio	Cement (kg/m³)	Bags/m³	Sand (m³/m³)	Gravel (m³/m³)	Water (L/m³)
C-7	Mechanical	1:4:8	150	3	0.42	0.84	60
C-15	Mechanical	1:3:6	200	4	0.41	0.82	80
C-20	Mechanical	1:2:4	275	5.5	0.39	0.78	110
C-25 to C-30	Mechanical	1:2:3	325	6.5	0.45	0.68	130
C-7	Hand	1:3.5:8	153	3.06	0.38	0.87	92
C-15	Hand	1:2.5:6	202	4.04	0.36	0.868	121

🪣 Mortar Calculator

Cement mortar (25% shrinkage, 5% wastage) and compo-mortar (20% shrinkage, 5% wastage) per m³ of finished mortar.

Cement mortar

Compo-mortar

Lightweight screed

Mix ratio

Volume (m³)

Cement mortar reference

Ratio	Cement (kg/m³)	Bags/m³	Sand (m³/m³)
1:3	460	9.2	0.99
1:4	368	7.4	1.05
1:5	306	6.1	1.09
1:6	263	5.3	1.13

Ratio	Cement (kg/m³)	Pumice (m³/m³)
1:6	263	1.13
1:8	205	1.17

🏗 Masonry Calculator

Material quantities per m² of wall. Brick masonry uses compo-mortar 1:2:9; hollow blocks use cement mortar 1:4.

Wall type

Wall area (m²)

Reference — per m²

Wall type	Units/m²	Wastage	Cement (kg/m²)	Lime (kg/m²)	Sand (m³/m²)
Half-brick 110mm	58	5%	5	4	0.034
One-brick 230mm	115	5%	12.5	3	0.081
HB 10cm block	13	5%	5	0	0.014
HB 15cm block	13	5%	7.5	0	0.022
HB 20cm block	13	5%	10	0	0.028

🖼 Plastering Calculator

Cement mortar plaster on walls, quantities per 10 m². Wastage: 12mm=20%, 15mm=15%, 20mm=12%, 25mm=10%.

Mix ratio

Thickness (mm)

Area (m²)

Plastering reference (per 10 m²)

Ratio	12mm cement(kg)	12mm sand(m³)	15mm cement(kg)	15mm sand(m³)	20mm cement(kg)	20mm sand(m³)	25mm cement(kg)	25mm sand(m³)
1:3	46.15	0.14	79.1	0.17	102.9	0.22	114.84	0.25
1:4	53	0.15	63.8	0.18	82.43	0.24	92	0.26
1:5	44.1	0.16	52.68	0.19	68.6	0.25	76.56	0.27
1:6	37.8	0.16	45.15	0.19	58.8	0.25	65.62	0.28

🎨 Painting Calculator

Standard coverage rates for 2–3 coat systems on prepared surfaces. Confirm against current manufacturer data sheets before pricing.

Surface type

Area (m²)

Coverage reference (L/m² per coat)

System	Primer (L/m²)	Undercoat (L/m²)	Finish (L/m²)	Note
Emulsion internal 2c	0.10	—	0.10	—
Emulsion internal 3c	0.10	0.10	0.10	—
Emulsion external 2c	—	—	—	0.24 L/m² total
Emulsion external 3c	—	—	—	0.30 L/m² total
Enamel wood 2c	0.08	—	0.07	0.5L thinner/gal
Enamel wood 3c	0.06	0.05	0.04	0.5L thinner/gal
Enamel steel 3c	0.06	0.05	0.04	—
Varnish wood door 3c	0.13	0.12	0.12	+knotting 0.01

🏠 Roofing Material Calculator

CIS (corrugated iron sheet) on wooden truss, up to 15° slope. Sheet coverage ~1.38 m²/sheet.

Roof area (m²)

Ridge length (m)

Gutter length (m)

Down-pipe runs

🔲 Flooring & Tiles Calculator

Material quantities for common floor finishes.

Floor finish type

Floor area (m²)

Reference

Finish	Primary	Cement (kg/m²)	Sand (m³/m²)	Notes
Terrazzo tile 20×20	26 pcs/m² +20%	10.12 + 0.46 grout	0.001 grout	—
Cement screed 2.5cm 1:3	20% mortar waste	13.78	0.03 m³/m²	—
Marble 2cm, bedded 1:4	1.02 m²/m²	10.12 bedding	0.029	Polish 0.03 kg/m²

📏 Rebar Weight Calculator

Steel reinforcement bar weight by diameter. Source: standard 12m bars, plain vs deformed.

Diameter (mm)

Bar type

Total length (m)

Standard 12m bar weights

Ø (mm)	Plain (kg/12m)	Deformed (kg/12m)	Plain (kg/m)	Deformed (kg/m)
6	2.664	2.808	0.222	0.234
8	4.740	4.992	0.395	0.416
10	7.404	7.776	0.617	0.648
12	10.656	11.184	0.888	0.932
14	14.520	15.240	1.210	1.270
16	18.960	19.920	1.580	1.660
18	26.760	28.000	2.230	2.333
20	29.760	31.187	2.480	2.599
22	35.760	37.560	2.980	3.130
25	46.200	48.600	3.850	4.050
28	57.960	71.760 ⚠	4.830	5.980 ⚠
30	75.720	79.560	6.310	6.630

⚠ Ø28 deformed value (71.760) may be an OCR/typo of ~63.7 — flagged, not corrected.

🔩 Steel Plate Weight Calculator

Mild steel plate weight by thickness. Select thickness and enter area to get total weight.

Thickness (mm)

Area (m²)

Full plate weight table

Thickness (mm)	kg/m²
3	23.55
4	31.40
5	39.25
6	47.10
8	62.80
10	78.50
12	94.20
14	109.90
16	125.60
18	141.30
20	157.00
22	172.70
25	196.20
28	219.80
32	251.20
36	282.60
40	314.00
45	353.20
50	392.50
56	439.60
63	496.50
70	549.50

📐 Angle Section Reference

Equal and unequal angle sections — weight per meter. Use the search to filter quickly.

Equal angles

Unequal angles

Section

Length (m)

Weight

—

Tonnes

—

🔧 Tube Section Reference

Rectangular and circular tube sections — weight per meter.

Rectangular tubes

Circular tubes

Section

Length (m)

Weight

—

Tonnes

—

⚗️ Mix Ratio Reference

General formula: Qty = UnitWeight × Fraction × ShrinkageFactor × WastageFactor × Volume (m³).

Cement mortar per m³

Ratio	Cement (kg/m³)	Sand (m³/m³)	Shrinkage	Wastage
1:3	460	0.99	25%	5%
1:4	368	1.05	25%	5%
1:5	306	1.09	25%	5%
1:6	263	1.13	25%	5%

Compo-mortar per m³

Ratio	Cement (kg/m³)	Lime (kg/m³)	Sand (m³/m³)
1:1:6	221	300	0.95
1:2:9	147	399	0.95
1/2:1:3	195	528	0.89

Concrete per m³ (primary table)

Class	Type	Ratio	Cement (kg)	Sand (m³)	Gravel (m³)	Water (L)
C-7	Mech	1:4:8	150	0.42	0.84	60
C-15	Mech	1:3:6	200	0.41	0.82	80
C-20	Mech	1:2:4	275	0.39	0.78	110
C-25–C30	Mech	1:2:3	325	0.45	0.68	130

📌 Nails & Standard Door Sizes

Reference data for nails (pieces per kg) and standard door dimensions.

Nail reference (pcs/kg)

Size	Pcs/kg
1 cm	950
2.5 cm (1")	~500
4.5 cm (1¾")	~200
5 cm (2")	~150
6.5 cm (2½")	~80
7.5 cm (3")	~50
10 cm (4")	~25

Standard door sizes

Type	Width (m)	Height (m)	Notes
Internal single	0.80 / 0.90	2.10	Standard internal
Main entrance single	0.90 / 1.00	2.10	—
Double door	1.60 / 1.80 / 2.00	2.10	Per leaf: ½ width
French window (double)	1.20 / 1.40	2.10	Glazed

✅ MEP Installation Checklist

Electrical and sanitary installation categories. Check off items as they are verified on site.

Electrical

Sanitary

Electrical installation — category checklist

📋 BOQ Builder

Add calculated items from any calculator to build a project Bill of Quantities summary.

Add line item

Description

Quantity

Unit

Unit cost (ETB)

Bill of Quantities

#	Description	Qty	Unit	Unit cost (ETB)	Total (ETB)

TOTAL ESTIMATED COST ETB 0.00

SOMA CEA — Material & Construction Formula App

🧱 Concrete Material Calculator

🪣 Mortar Calculator

🏗 Masonry Calculator

🖼 Plastering Calculator

🎨 Painting Calculator

🏠 Roofing Material Calculator

🔲 Flooring & Tiles Calculator

📏 Rebar Weight Calculator

🔩 Steel Plate Weight Calculator

📐 Angle Section Reference

🔧 Tube Section Reference

⚗️ Mix Ratio Reference

📌 Nails & Standard Door Sizes

✅ MEP Installation Checklist

📋 BOQ Builder