What Is the To-Complete Performance Index? A Complete Guide to the TCPI Formula for PMP

The To-Complete Performance Index, or TCPI, is an earned value management formula that tells a project team how efficiently it must spend its remaining budget to finish the project on target. It compares the work still left to do, calculated as BAC minus EV, against the money still available, calculated as either BAC minus AC or EAC minus AC depending on which target the organisation is still pursuing. A TCPI above 1.0 means the team must work more efficiently than it has so far, a TCPI below 1.0 means it can afford to relax slightly, and a TCPI of exactly 1.0 means current performance is already good enough. On the PMP exam, TCPI questions almost always hinge on correctly reading whether a revised budget has been approved, because that single detail decides which of the two formulas applies.

Key Highlights of To-Complete Performance Index (TCPI)

• TCPI has two formulas, one that measures efficiency needed to hit the original Budget at Completion (BAC) and one that measures efficiency needed to hit a revised Estimate at Completion (EAC), and PMP candidates are expected to know when each applies.
• A TCPI result greater than 1.0 signals the remaining work must be completed more efficiently than the project has performed to date, while a result below 1.0 means the team has room to spare.
• Comparing TCPI directly against the project's current Cost Performance Index (CPI) is the fastest way to judge whether a budget target is realistic or wishful thinking.
• When EAC is calculated using the common assumption that future cost performance will match the cumulative CPI, TCPI to complete EAC works out to be mathematically identical to CPI itself, a relationship worth knowing for calculation-heavy questions.
• PMI's Examination Content Outline places TCPI-style forecasting inside the Process domain's cost and schedule monitoring tasks, where scenario wording, not formula memorisation, decides the correct answer.
• TCPI sits alongside CPI, SPI, CV, SV, EAC and VAC as one member of a connected EVM formula family, and exam questions increasingly test whether a candidate can move between these formulas rather than recite just one in isolation.
• Organisations that standardise how project controllers calculate and report TCPI across a portfolio catch budget overruns weeks earlier than teams that calculate it inconsistently or only at month end.

What Does TCPI Actually Measure?

TCPI measures the cost efficiency a project team must achieve on its remaining work in order to hit a specific budget target. It is a forward-looking ratio, unlike CPI and SPI, which report how the project has performed up to the data date. Where CPI answers the question "how efficient has this project been so far", TCPI answers a different question entirely: "how efficient does this project need to be, from this point forward, to land on budget".

The formula divides the value of work still remaining by the funds still remaining. Work remaining is calculated as BAC minus EV, the gap between the total planned scope value and the value already earned. Funds remaining is calculated one of two ways, depending on which budget figure the organisation still treats as its target. That distinction, target budget versus revised forecast, is the single most exam-relevant fact about TCPI, and it drives almost every trap PMI question-writers build around this formula.

PMI's own learning library, in a resource titled To-Complete Performance Index (TCPI), frames the formula the same way: a measure of the cost performance that must be achieved with the remaining funds in order to meet a specified management goal, whether that goal is the original BAC or a revised EAC.

The Two TCPI Formulas: BAC vs EAC

Both TCPI formulas share the same numerator and differ only in the denominator. The table below sets them side by side so the difference is easy to see at a glance.

TCPI to Complete the Original Budget

TCPI to complete BAC assumes the organisation has not given up on the original budget. The numerator, BAC minus EV, is the value of work not yet earned. The denominator, BAC minus AC, is the money left in the original budget after subtracting what has already been spent. Dividing the two produces the cost efficiency the remaining work must achieve to still land exactly on the original BAC.

TCPI to Complete a Revised Estimate

TCPI to complete EAC is used once a project has effectively accepted that the original BAC is no longer realistic and a new forecast, the EAC, has been formally approved as the new target. The numerator stays the same, BAC minus EV, because the scope of remaining work has not changed. The denominator switches to EAC minus AC, the funds still available under the new forecast. This version answers a slightly different question: given the money we now expect to spend in total, how efficient must the rest of the project be?

Which TCPI Formula Should You Use, and When?

The decision rule is simpler than most PMP candidates expect: use the BAC formula by default, and switch to the EAC formula only once a revised cost estimate has been explicitly approved as the new baseline target. PMI exam scenarios rarely leave this ambiguous; they signal it through specific wording.

1. Read for approval language first. Phrases such as "the original budget is no longer achievable and the sponsor has approved a new estimate" point to the EAC formula. Silence on any budget change, or a scenario that simply asks "what efficiency is needed to finish within budget", points to the BAC formula.
2. Confirm which total cost figure the question supplies. If the question gives you an EAC value and asks you to use it, that is your denominator target. If only BAC, EV and AC are given, the BAC formula is almost certainly what is being tested.
3. Check the question is not really asking for CPI. Some questions supply EV and AC and ask for "the efficiency achieved so far", which is CPI, not TCPI. TCPI only appears when the question asks about the efficiency still required.
4. Sanity-check the result against CPI. A TCPI wildly higher than the current CPI, with no mention of corrective action, budget increase or scope cut in the answer options, is usually a signal you have picked the wrong formula or misread a value.

Worked Example 1: Calculating TCPI Using BAC

A construction project has a Budget at Completion of 500,000 US dollars. At the current reporting date, the earned value is 220,000 US dollars and the actual cost incurred is 260,000 US dollars. No budget change has been approved, so the original BAC remains the management target.

Applying the BAC formula: TCPI = (500,000 − 220,000) ÷ (500,000 − 260,000) = 280,000 ÷ 240,000 = 1.17.

The project's current CPI is EV divided by AC, or 220,000 divided by 260,000, which equals 0.85. Comparing the two figures side by side, TCPI of 1.17 against CPI of 0.85, tells the story: the team has been running at 85 percent efficiency so far, but finishing on the original 500,000 budget now requires running at 117 percent efficiency for the rest of the project. That is a 32-point swing in the wrong direction, which most experienced project controllers would flag as unrealistic without a specific, credible corrective action plan such as adding a more productive crew, cutting remaining scope or resequencing work to remove cost drivers.

Worked Example 2: Calculating TCPI Using EAC

An IT implementation project has a BAC of 1,200,000 US dollars. At the current data date, EV is 540,000 US dollars and AC is 600,000 US dollars, giving a current CPI of 540,000 divided by 600,000, or 0.90. Cost performance has been consistently below plan, so the project sponsor has formally approved a revised forecast, an EAC of 1,300,000 US dollars, as the new cost target, replacing the original BAC for forecasting purposes.

Applying the EAC formula: TCPI = (1,200,000 − 540,000) ÷ (1,300,000 − 600,000) = 660,000 ÷ 700,000 = 0.943.

Here the required efficiency, 0.943, sits just below the current CPI of 0.90, close enough that the target is credible without heroic assumptions. This is precisely why organisations rebaseline: an EAC-based TCPI close to, or slightly above, current CPI is normally achievable, whereas a BAC-based TCPI far above CPI, as in Example 1, is the figure that should trigger escalation rather than optimism.

There is also a mathematical relationship worth knowing for calculation questions. When EAC is derived using the common forecasting assumption that future cost performance will continue at the current cumulative CPI, that is, EAC = AC + (BAC − EV) ÷ CPI, then TCPI to complete that particular EAC always works out to be exactly equal to CPI itself. This is not a coincidence; it falls directly out of the algebra, since the denominator EAC minus AC reduces to (BAC − EV) divided by CPI, and dividing the numerator by that same expression cancels back to CPI. PMI question-writers sometimes build a question around this identity specifically to test whether a candidate understands why the numbers land where they do, rather than just plugging figures into a memorised formula.

What Does a TCPI Result Above, Below, or At 1.0 Mean?

A TCPI value is only meaningful once it is interpreted against the number 1.0 and, ideally, against the project's current CPI. The table below summarises the three possible outcomes and what each one implies for a project manager.

A single TCPI figure without context can mislead a reader, which is why it should never be reported alone. A TCPI of 1.05 sounds mild in isolation, but if the project's current CPI is 0.70, that 1.05 target represents a 50 percent improvement in cost efficiency with no stated plan to achieve it, and a competent project manager would treat that as a red flag rather than a footnote.

How TCPI Relates to CPI, SPI and the Rest of the EVM Formula Family

TCPI does not stand alone. It belongs to a connected family of earned value management formulas that PMI expects PMP candidates to move between fluently, not memorise in isolation. The table below places TCPI alongside its closest relatives.

CPI and SPI describe history. EAC and VAC describe a forecast based on that history continuing. TCPI is different again: it describes a requirement, the exact performance level the remaining work must hit, regardless of whether that level is realistic. Reading a full earned value report means reading all of these together, not picking one number in isolation, a point the PMBOK Guide makes by covering the full EVM formula set together within its cost management content rather than treating any single index as sufficient on its own.

A project manager who wants a deeper grounding in how CPI and SPI are calculated and reported day to day can review Simpliaxis's dedicated guide on CPI and SPI project management metrics, and a project manager forecasting the budget shortfall or surplus these metrics point towards should also read the companion guide to Variance at Completion, which covers the VAC calculation TCPI results are often used to sanity-check.

How TCPI Shows Up on the PMP Exam

TCPI questions on the PMP exam generally take one of three shapes: a straight calculation, an interpretation question that asks what a given TCPI means, or a scenario question that asks which formula to apply. PMI's current Examination Content Outline places this kind of cost and schedule forecasting work inside the Process domain, which carries the largest share of exam weighting of the three domains alongside People and Business Environment.

Formula-based questions of this type, spanning CPI, SPI, EAC, VAC and TCPI together, typically make up a noticeable share of the exam's quantitative content, so treating TCPI as an isolated flashcard fact rather than one node in a connected formula set is a common and avoidable source of lost marks.

The table below lists the traps that recur most often in TCPI-style questions, based on how the topic is consistently tested across PMP prep resources.

Candidates preparing for these scenario-style questions benefit from timed practice under realistic conditions rather than isolated flashcard drills. Simpliaxis provides a free set of PMP practice exam questions with explanations that includes several cost and schedule forecasting items in this style, which is a useful way to test whether a TCPI concept has actually been understood rather than just memorised.

Why Organisations Standardise TCPI Reporting Across Project Teams

TCPI is not only an exam formula; it is a genuine early-warning tool, and its value depends entirely on being calculated consistently across every project in a portfolio. A single project controller who understands TCPI well is useful. A PMO director who has trained every project controller in the organisation to calculate TCPI the same way, report it against the same thresholds, and escalate at the same trigger points is in a fundamentally stronger position to catch budget drift before it becomes unrecoverable, because the numbers from different projects can finally be compared like for like.

This is precisely the gap that structured, cohort-based training closes. Rather than each project controller picking up TCPI, EAC and VAC conventions informally from whichever mentor happened to train them, organisations that put their whole project controls function through the same programme end up with a shared vocabulary and shared thresholds for what counts as an acceptable TCPI versus a red flag. Simpliaxis's corporate and group training programmes are built for exactly this scenario, bringing an entire team of project managers or project controllers through PMP-aligned cost forecasting formulas, TCPI included, together, so that a TCPI of 1.15 means the same thing and triggers the same conversation whether it appears on a construction project's dashboard or an IT programme's status report.

For an individual project manager rather than a full team, the same underlying content is covered in Simpliaxis's standard PMP certification training course, which works through the full earned value formula set, TCPI included, alongside the rest of PMI's current Examination Content Outline. Anyone comparing the investment against the exam and credentialing costs involved can review the full breakdown on Simpliaxis's PMP certification cost page before committing to a training path.

Conclusion

TCPI earns its place on the PMP exam because it forces a project manager to answer a question CPI and SPI cannot answer on their own: not how has this project performed, but how must it perform from here to still hit its target. The formula itself is short, remaining work divided by remaining funds, but choosing the right denominator, BAC or EAC, and correctly interpreting what the resulting number implies is where genuine understanding is tested. A TCPI close to current CPI is a credible target.

A TCPI far above current CPI, with no corrective plan attached, is a warning sign dressed up as an index number. Treating TCPI as one connected piece of the broader EVM formula family, alongside CPI, SPI, EAC and VAC, rather than an isolated fact to memorise, is what turns this from an exam-day trap into a genuinely useful forecasting habit that carries over directly into real project controls work after certification.