---
title: "Rate analysis: 25 mm 1:2:4 concrete floor"
subject: "Estimating and Costing"
chapter: 4
key: "semester_7/estimating_and_costing:rate-cc-floor-25mm"
source: https://www.bctengineer.com/q/semester_7/estimating_and_costing/rate-cc-floor-25mm
site: BCT Engineering
---

# Rate analysis: 25 mm 1:2:4 concrete floor

Estimating and Costing · Chapter 4: Analysis of Rates

- Asked in: 2075 Chaitra, 5 marks
- Video: [Rate Analysis of Concrete 1:2:4 - Construction](https://www.youtube.com/watch?v=HzXHO4LEYq8) — Construction Knowledge
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_7/estimating_and_costing/rate-cc-floor-25mm
- Whole chapter: https://www.bctengineer.com/md/semester_7/estimating_and_costing/chapter-4

## Question

Prepare analysis of rate for 25 mm thick 1:2:4 cement concrete floor per 100 m². (Assume suitable rate)

## Short answer

For 100 m² of 25 mm thick 1:2:4 floor, wet volume 2.5 m³, dry volume 3.85 m³. Requires cement 15.84 bags, sand 1.10 m³, aggregate 2.20 m³, mason 8 days, labourer 14 days. Adding 15% overhead and 10% profit gives rate NPR 72,687.50 per 100 m² (NPR 726.88/m²).

## Answer

Rates and labour norms below are illustrative (DUDBC-style norms; use the current District Rate and norms of the project area for a real estimate): cement NPR 1,000/bag, sand NPR 3,500/m³, 20 mm aggregate NPR 4,500/m³, skilled labour NPR 1,500/day, unskilled labour NPR 1,100/day, water lump sum, contractor's overhead 15% and profit 10% on direct cost (VAT excluded). Aggregate of 12 mm size is taken at NPR 4,800/m³.

#### Quantities per 100 m²

- Wet volume $= 100 \times 0.025 = 2.5$ m³; dry volume $= 1.54 \times 2.5 = 3.850$ m³
- Cement $= 1/7 \times 3.850 = 0.550$ m³ $= 15.84$ bags
- Sand $= 1.100$ m³; aggregate $= 2.200$ m³
- Labour (assumed): mason 8 days, labourer 14 days per 100 m² for laying, levelling, finishing and curing.

#### Analysis

| Item | Qty | Unit | Rate (NPR) | Amount (NPR) |
|---|---:|---|---:|---:|
| Cement | 15.84 | bag | 1,000.00 | 15,840.00 |
| Sand | 1.100 | m³ | 3,500.00 | 3,850.00 |
| Aggregate (12 mm) | 2.200 | m³ | 4,800.00 | 10,560.00 |
| Skilled labour (mason) | 8.0 | day | 1,500.00 | 12,000.00 |
| Unskilled labour | 14.0 | day | 1,100.00 | 15,400.00 |
| Water and curing (lump) | 1 | LS | 500.00 | 500.00 |
| **Direct cost** | | | | **58,150.00** |
| Contractor's overhead @ 15% | | | | 8,722.50 |
| Contractor's profit @ 10% | | | | 5,815.00 |
| **Total (rate per 100 m²)** | | | | **72,687.50** |

**Rate = NPR 72,687.50 per 100 m²** (NPR 726.88 per m²).

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Dry volume for 100 m^2 of 25 mm CC?
   A. 2.5 m^3
   B. 3.850 m^3 (1.54 x 2.5)
   C. 3.175 m^3
   D. 0.385 m^3
   Answer: B. Wet 100 x 0.025 = 2.5 m^3. (Key point: Dry volume)

2. Cement from 1:2:4?
   A. 1/7 x 3.850 = 0.550 m^3 = 15.84 bags
   B. 1/6 x 3.85
   C. 1/7 x 2.5
   D. 2/7 x 3.85
   Answer: A. Ratio sum 7. (Key point: Cement)

3. Rate per 100 m^2 NPR 72,687.50 gives per m^2?
   A. NPR 7,268.75
   B. NPR 72.69
   C. NPR 726.88
   D. NPR 581.50
   Answer: C. Divide by 100. (Key point: Per m^2 rate)

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