BAC कॅल्क्युलेटर एप्रिल 2026 · 6 मिनिटे वाचन

बजेट अॅट कंप्लीशन (BAC) म्हणजे काय?

बजेट अॅट कंप्लीशन (BAC) म्हणजे सर्व प्रकल्प कामांसाठी एकूण मंजूर बजेट, जे अंमलबजावणी सुरू होण्यापूर्वी निश्चित बेसलाइन म्हणून स्थापित केले जाते. PMBOK 6 व्या आवृत्तीनुसार (पृ.263), BAC म्हणजे करायच्या सर्व कामांसाठी स्थापित बजेटची बेरीज होय. हा Earned Value Management चा आर्थिक पाया आहे — अशी संख्या ज्याच्या तुलनेत सर्व खर्च आणि वेळापत्रक कामगिरी मोजली जाते.

PMBOK ची BAC ची व्याख्या

प्रोजेक्ट मॅनेजमेंट बॉडी ऑफ नॉलेज (PMBOK® मार्गदर्शक, 6 वी आवृत्ती) BAC ची व्याख्या खालीलप्रमाणे करते:

BAC = प्रकल्पावर करायच्या कामासाठी स्थापित सर्व बजेटची बेरीज

सर्वात महत्त्वाचे म्हणजे, BAC प्रकल्पाच्या बेसलाइनवर निश्चित असतो. खर्च वाढल्यास तो बदलत नाही — ते Estimate at Completion (EAC) मध्ये दिसून येईल. जेव्हा मंजूर केलेल्या कामाची व्याप्ती मूलभूतपणे बदलते, तेव्हाच BAC केवळ औपचारिक री-बेसलाइनिंग प्रक्रियेद्वारे बदलतो.

BAC वि कॉस्ट बेसलाइन वि प्रकल्प बजेट

शब्द	समाविष्ट आहे	बदलते?
प्रकल्प बजेट	BAC + व्यवस्थापन राखीव (Management Reserve)	केवळ औपचारिक बदल नियंत्रणाद्वारे
कॉस्ट बेसलाइन (BAC)	सर्व वर्क पॅकेज + आकस्मिक राखीव (Contingency Reserve)	केवळ री-बेसलाइनिंगद्वारे
EAC	अंदाजित प्रत्यक्ष एकूण खर्च	अंमलबजावणी दरम्यान नियमितपणे अपडेट केले जाते

5 BAC अंदाज पद्धती

1. बॉटम-अप अंदाज (सर्वात अचूक)

प्रत्येक वर्क पॅकेजचा वैयक्तिकरित्या अंदाज घ्या आणि त्यांची बेरीज करा. अचूकता: ±5–10%. विस्तृत व्याप्ती उपलब्ध असताना सर्वोत्तम. हे स्वयंचलितपणे करण्यासाठी आमचा BAC Builder वापरा.

2. समान अंदाज (Analogous)

समान मागील प्रकल्पांमधील प्रत्यक्ष खर्च वापरा. अचूकता: ±25–75%. प्रकल्पाच्या सुरुवातीच्या टप्प्यांसाठी सर्वोत्तम जेव्हा तपशील मर्यादित असतो. जलद परंतु तुलनात्मक ऐतिहासिक डेटावर अवलंबून असते.

3. पॅरामेट्रिक अंदाज

व्हेरिएबल्समधील सांख्यिकीय संबंध वापरा (उदा. प्रति चौरस मीटर खर्च, प्रति सॉफ्टवेअर फंक्शन पॉइंट खर्च). अचूकता: ±10–20%. जेव्हा विश्वसनीय ऐतिहासिक डेटा अस्तित्वात असतो तेव्हा सर्वोत्तम.

4. तीन-बिंदू अंदाज (PERT)

सूत्र: BAC = (आशावादी + 4 × सर्वाधिक संभाव्य + निराशावादी) / 6. अनिश्चिततेचा विचार करतो. सिंगल-पॉइंट अंदाजांपेक्षा अधिक सांख्यिकीयदृष्ट्या वैध अंदाज तयार करतो.

5. तज्ञांचा निर्णय

जेव्हा ऐतिहासिक डेटा अनुपलब्ध असतो तेव्हा विषय तज्ञांचा सल्ला घ्या. अनेकदा इतर पद्धतींसोबत एकत्र केले जाते. अचूकता तज्ञांच्या अनुभवावर खूप अवलंबून असते.

खरे बांधकाम उदाहरण

खर्च श्रेणी

बजेट

कामगार आणि मनुष्यबळ

$400,000

साहित्य आणि पुरवठा

$250,000

उपठेकेदार

$200,000

उपकरणे भाड्याने

Budget at Completion Calculator April 2026 · 6 min read

What is Budget at Completion (BAC)?

Budget at Completion (BAC) is the total approved budget for all project work, established as a fixed baseline before execution begins. Per PMBOK 6th Edition (p.263), BAC equals the sum of all budgets for the work to be performed. It is the financial anchor of Earned Value Management — the number against which all cost and schedule performance is measured.

PMBOK Definition of BAC

The Project Management Body of Knowledge (PMBOK® Guide, 6th Edition) defines BAC as:

BAC = The sum of all budgets established for the work to be performed on a project

Critically, BAC is fixed at project baseline. It does not change when cost overruns occur — that would be reflected in Estimate at Completion (EAC). BAC only changes through a formal re-baselining process when the approved scope of work changes fundamentally.

BAC vs Cost Baseline vs Project Budget

Term	Includes	Changes?
Project Budget	BAC + Management Reserve	Only via formal change control
Cost Baseline (BAC)	All work packages + Contingency Reserve	Only via re-baselining
EAC	Forecast of actual total cost	Updated regularly during execution

5 BAC Estimation Techniques

1. Bottom-Up Estimation (Most Accurate)

Estimate each work package individually and sum them. Accuracy: ±5–10%. Best when detailed scope is available. Use our BAC Builder to do this automatically.

2. Analogous Estimation

Use actual costs from similar past projects. Accuracy: ±25–75%. Best for early project stages when detail is limited. Fast but relies on comparable historical data.

3. Parametric Estimation

Use statistical relationships between variables (e.g., cost per square metre, cost per software function point). Accuracy: ±10–20%. Best when reliable historical data exists.

4. Three-Point Estimation (PERT)

Formula: BAC = (Optimistic + 4 × Most Likely + Pessimistic) / 6. Accounts for uncertainty. Produces a more statistically valid estimate than single-point estimates.

5. Expert Judgement

Consult subject matter experts when historical data is unavailable. Often combined with other techniques. Accuracy highly dependent on expert experience.

Real Construction Example

Cost Category	Budget
Labour & Workforce	$400,000
Materials & Supplies	$250,000
Subcontractors	$200,000
Equipment Rental	$100,000
Contingency Reserve (10%)	$95,000
BAC (Cost Baseline)	$1,045,000
Management Reserve	$55,000
Total Project Budget	$1,100,000

Common BAC Pitfalls

Incomplete scope definition — BAC underestimated because not all work packages were identified
Missing indirect costs — Overhead, G&A, and fringe benefits excluded from estimates
Ignoring risk — No contingency or management reserve included
Weak change control — Scope creep added without updating the cost baseline

BAC, EAC, and VAC — Key Relationships

Metric	Formula	Meaning
BAC	Fixed at baseline	What we planned to spend
EAC	BAC / CPI (most common)	What we now forecast to spend
VAC	BAC − EAC	Projected surplus (+) or overrun (−)

→ Open the Free BAC Calculator 00,000

आकस्मिक राखीव (10%)

$95,000

BAC (कॉस्ट बेसलाइन)

Budget at Completion Calculator April 2026 · 6 min read
What is Budget at Completion (BAC)?
Budget at Completion (BAC) is the total approved budget for all project work, established as a fixed baseline before execution begins. Per PMBOK 6th Edition (p.263), BAC equals the sum of all budgets for the work to be performed. It is the financial anchor of Earned Value Management — the number against which all cost and schedule performance is measured.
PMBOK Definition of BAC
The Project Management Body of Knowledge (PMBOK® Guide, 6th Edition) defines BAC as:
BAC = The sum of all budgets established for the work to be performed on a project
Critically, BAC is fixed at project baseline. It does not change when cost overruns occur — that would be reflected in Estimate at Completion (EAC). BAC only changes through a formal re-baselining process when the approved scope of work changes fundamentally.
BAC vs Cost Baseline vs Project Budget
Term Includes Changes?
Project Budget BAC + Management Reserve Only via formal change control
Cost Baseline (BAC) All work packages + Contingency Reserve Only via re-baselining
EAC Forecast of actual total cost Updated regularly during execution
5 BAC Estimation Techniques
1. Bottom-Up Estimation (Most Accurate)
Estimate each work package individually and sum them. Accuracy: ±5–10%. Best when detailed scope is available. Use our BAC Builder to do this automatically.
2. Analogous Estimation
Use actual costs from similar past projects. Accuracy: ±25–75%. Best for early project stages when detail is limited. Fast but relies on comparable historical data.
3. Parametric Estimation
Use statistical relationships between variables (e.g., cost per square metre, cost per software function point). Accuracy: ±10–20%. Best when reliable historical data exists.
4. Three-Point Estimation (PERT)
Formula: BAC = (Optimistic + 4 × Most Likely + Pessimistic) / 6. Accounts for uncertainty. Produces a more statistically valid estimate than single-point estimates.
5. Expert Judgement
Consult subject matter experts when historical data is unavailable. Often combined with other techniques. Accuracy highly dependent on expert experience.
Real Construction Example
Cost Category Budget
Labour & Workforce $400,000
Materials & Supplies $250,000
Subcontractors $200,000
Equipment Rental $100,000
Contingency Reserve (10%) $95,000
BAC (Cost Baseline) $1,045,000
Management Reserve $55,000
Total Project Budget $1,100,000
Common BAC Pitfalls
Incomplete scope definition — BAC underestimated because not all work packages were identified
Missing indirect costs — Overhead, G&A, and fringe benefits excluded from estimates
Ignoring risk — No contingency or management reserve included
Weak change control — Scope creep added without updating the cost baseline
BAC, EAC, and VAC — Key Relationships
Metric Formula Meaning
BAC Fixed at baseline What we planned to spend
EAC BAC / CPI (most common) What we now forecast to spend
VAC BAC − EAC Projected surplus (+) or overrun (−)
→ Open the Free BAC Calculator ,045,000

व्यवस्थापन राखीव

$55,000

एकूण प्रकल्प बजेट

सामान्य BAC चुका

अपूर्ण व्याप्ती व्याख्या — BAC कमी अंदाजित कारण सर्व वर्क पॅकेज ओळखले गेले नाहीत
अप्रत्यक्ष खर्च वगळणे — ओव्हरहेड, G&A आणि अतिरिक्त लाभ अंदाजांमधून वगळलेले
धोक्याकडे दुर्लक्ष करणे — कोणताही आकस्मिक किंवा व्यवस्थापन राखीव निधी समाविष्ट केलेला नाही
कमकुवत बदल नियंत्रण — कॉस्ट बेसलाइन अपडेट न करता व्याप्ती वाढवली

BAC, EAC आणि VAC — प्रमुख संबंध

मेट्रिक	सूत्र	अर्थ
BAC	बेसलाइनवर निश्चित	आम्ही काय खर्च करण्याची योजना आखली होती
EAC	BAC / CPI (सर्वात सामान्य)	आम्ही आता काय खर्च करण्याचा अंदाज लावतो
VAC	BAC − EAC	अंदाजित शिल्लक (+) किंवा ओव्हररन (−)

→ मोफत BAC कॅल्क्युलेटर उघडा