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Civil EngineeringWBPSC AE · SSC JE · RRB JE

Estimation and Costing— Important Topics, Formulas & MCQs

Estimation, Costing & Valuation covers quantity surveying, rate analysis, specifications and the valuation of property. It is a practical, calculation-based subject with standard methods of measurement.

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Important topics in Estimation and Costing

Methods of estimation — centre-line, long & short wall
Quantity take-off for buildings
Rate analysis
Specifications — general & detailed
Earthwork — trapezoidal & prismoidal formulae
Valuation — methods & depreciation
Measurement of works (IS 1200)
Bar bending schedule
Contracts & tender documents
Cost of materials & labour
Must-know

Key concepts & formulas — Estimation and Costing

Centre-line method

Quantity = centre-line length × cross-section; fast for symmetrical buildings.

Prismoidal formula

V = (D/3)(A₁ + 4Am + A₂) — more accurate earthwork volume than the trapezoidal rule.

Depreciation (straight line)

Annual depreciation = (cost − scrap value)/life.

Plinth area rate

Approximate estimate = plinth area × prevailing plinth-area rate.

Exam relevance

3–4 questions in AE papers; pairs well with practical site knowledge.

Study tip

Be fluent with earthwork formulae and the centre-line method — they appear as direct numericals.

Worked example

Sample Estimation and Costing MCQ

The most accurate method for computing the volume of earthwork is the:

A. Trapezoidal formula
B. Prismoidal formula
C. Mid-section formula
D. Mean-area method
Answer: B. The prismoidal formula V = (D/3)(A₁ + 4Am + A₂) is the most accurate; a prismoidal correction is subtracted from the trapezoidal result.

Common mistakes to avoid

The prismoidal formula is more accurate than the trapezoidal rule (apply the prismoidal correction).
Use the centre-line method only for symmetrical buildings to avoid double counting at junctions.
Straight-line depreciation = (cost − scrap value) / life.
Plinth area is the covered built-up area measured at floor level, including walls.
Keep going

Related Civil Engineering subjects

Strength of Materials
RCC
Steel Structures
Soil Mechanics
Foundation Engineering
Surveying
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