Phillips 66MEX:PSX 66 WACC % is 3.37% as of Jun. 27, 2026, which is 58% below its 10-year median of 8.00. GuruFocus rates MEX:PSX with a GF Score™ of 66/100 and a GF Value™ of MXN2,508.61 (Modestly Overvalued). The stock has 6 warning signs investors should review. Among 1,036 Oil & Gas companies, Phillips 66 ranks better than 53.09% on this metric.
As of today (2026-06-27), Phillips 66's weighted average cost of capital is 3.37%%. Phillips 66's ROIC % is 5.35% (calculated using TTM income statement data).
Phillips 66 generates higher returns on investment than it costs the company to raise the capital needed for that investment. It is earning excess returns. A firm that expects to continue generating positive excess returns on new investments in the future will see its value increase as growth increases.
For a comprehensive WACC calculation, please access the WACC Calculator.
Phillips 66 (MEX:PSX) WACC % Explanation
Because it costs money to raise capital. A firm that generates higher ROIC % than it costs the company to raise the capital needed for that investment is earning excess returns. A firm that expects to continue generating positive excess returns on new investments in the future will see its value increase as growth increases, whereas a firm that earns returns that do not match up to its cost of capital will destroy value as it grows.
As of today, Phillips 66's weighted average cost of capital is 3.37%%. Phillips 66's ROIC % is 5.35% (calculated using TTM income statement data).
Phillips 66 generates higher returns on investment than it costs the company to raise the capital needed for that investment. It is earning excess returns. A firm that expects to continue generating positive excess returns on new investments in the future will see its value increase as growth increases.
Be Aware
1. GuruFocus uses book value of debt (D) to do the calculation. It is simplified by adding latest one-year quarterly average Short-Term Debt & Capital Lease Obligation and Long-Term Debt & Capital Lease Obligation together.
For companies that report quarterly, GuruFocus combines all of the most recent year's quarterly debt data from the beginning of the year to the year-end and calculates the average.
For companies that report semi-annually, GuruFocus combines all of the most recent year's semi-annual debt data from the start of the year to the year-end and calculates the average.
For companies that report annually, GuruFocus combines the beginning and ending annual debt data from the most recent year and then calculates the average.
2. The WACC formula discussed above does not include Preferred Stock. Please adjust if preferred stock is considered.
3. (Expected Return of the Market - Risk-Free Rate of Return) is also called market premium. GuruFocus requires market premium to be 6%.
4. GuruFocus uses the latest TTM Interest Expense divided by the latest one-year quarterly average debt to get the simplified cost of debt.
Related Terms
Phillips 66 WACC % Historical Data
* Premium members only.
The historical data trend for Phillips 66's WACC % can be seen below:
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
For the Oil & Gas Refining & Marketing subindustry, Phillips 66's WACC %, along with its competitors' market caps and WACC % data, can be viewed below:
* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.
Phillips 66 WACC % vs Oil & Gas Industry
For the Oil & Gas industry and Energy sector, Phillips 66's WACC % distribution charts can be found below:
* The bar in red indicates where Phillips 66's WACC % falls into.
The weighted average cost of capital (WACC) is the rate that a company is expected to pay on average to all its security holders to finance its assets. The WACC is commonly referred to as the firm's cost of capital. Generally speaking, a company's assets are financed by debt and equity. WACC is the average of the costs of these sources of financing, each of which is weighted by its respective use in the given situation. By taking a weighted average, we can see how much interest the company has to pay for every dollar it finances.
WACC
=
E
/
(E + D)
*
Cost of Equity
+
D
/
(E + D)
*
Cost of Debt
*
(1 - Tax Rate)
1. Weights:
Generally speaking, a company's assets are financed by debt and equity. We need to calculate the weight of equity and the weight of debt.
The market value of equity (E) is also called "Market Cap". As of today, Phillips 66's market capitalization (E) is MXN1205618.786 Mil.
The market value of debt is typically difficult to calculate, therefore, GuruFocus uses book value of debt (D) to do the calculation. It is simplified by adding the latest one-year quarterly average Short-Term Debt & Capital Lease Obligation and Long-Term Debt & Capital Lease Obligation together. As of Mar. 2026, Phillips 66's latest one-year quarterly average Book Value of Debt (D) is MXN404412.449 Mil.
a) weight of equity = E / (E + D) = 1205618.786 / (1205618.786 + 404412.449) = 0.7488
b) weight of debt = D / (E + D) = 404412.449 / (1205618.786 + 404412.449) = 0.2512
2. Cost of Equity:
GuruFocus uses Capital Asset Pricing Model (CAPM) to calculate the required rate of return. The formula is:
Cost of Equity = Risk-Free Rate of Return + Beta of Asset * (Expected Return of the Market - Risk-Free Rate of Return)
a) GuruFocus uses 10-Year Treasury Constant Maturity Rate as the risk-free rate. It is updated daily. The current risk-free rate is 4.376%. Please go to Economic Indicators page for more information. Please note that we use the 10-Year Treasury Constant Maturity Rate of the country/region where the company is headquartered. If the data for that country/region is not available, then we will use the 10-Year Treasury Constant Maturity Rate of the United States as default.
b) Beta is the sensitivity of the expected excess asset returns to the expected excess market returns. Phillips 66's beta is -0.2237.
c) (Expected Return of the Market - Risk-Free Rate of Return) is also called market premium. GuruFocus requires market premium to be 6%.
Cost of Equity = 4.376% + -0.2237 * 6% = 3.0338%
3. Cost of Debt:
GuruFocus uses latest TTM Interest Expense divided by the latest one-year quarterly average debt to get the simplified cost of debt.
As of Mar. 2026, Phillips 66's interest expense (positive number) was MXN21049.98 Mil. Its total Book Value of Debt (D) is MXN404412.449 Mil.
Cost of Debt = 21049.98 / 404412.449 = 5.2051%.
4. Multiply by one minus TTM Tax Rate:
GuruFocus uses the most recent TTM Tax Expense divided by the most recent TTM Pre-Tax Income to calculate the tax rate. The calculated TTM tax rate is limited to between 0% and 100%. If the calculated tax rate is higher than 100%, it is set to 100%. If the calculated tax rate is less than 0%, it is set to 0%.
The latest calculated TTM Tax Rate = 14789.143 / 91601.384 = 16.15%.
Phillips 66's Weighted Average Cost Of Capital (WACC) for Today is calculated as:
WACC
=
E / (E + D)
*
Cost of Equity
+
D / (E + D)
*
Cost of Debt
*
(1 - Tax Rate)
=
0.7488
*
3.0338%
+
0.2512
*
5.2051%
*
(1 - 16.15%)
=
3.37%
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
Phillips 66 (MEX:PSX) has a WACC % of 3.37% as of Jun. 27, 2026. The weighted average cost of capital (WACC) is the average rate a company pays to finance assets. View historical data on Phillips 66 and its competitors. This is 58% below median its historical median of 8.00. Over the past decade, Phillips 66's WACC % has ranged from 6.52 to 10.52. According to the industry distribution chart, Phillips 66 ranks #486 out of 1036 companies in the Oil & Gas industry, placing it in the top 46.9%.
Is Phillips 66's WACC % too high?
Phillips 66's current WACC % of 3.37% is 58% below median its 10-year median of 8.00. Over the past 10 years, this metric has ranged from a low of 6.52 to a high of 10.52. The Oil & Gas industry median WACC % is 7.40. Phillips 66's value of 3.37% is 54.5% below this industry median. Based on the distribution chart, Phillips 66 ranks #486 out of 1036 companies in the Oil & Gas industry, which is above the industry midpoint. Overall, Phillips 66 has a GF Score™ of 66/100 and is considered Modestly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Phillips 66's WACC % compare to MPC and VLO?
According to the Oil & Gas industry distribution chart, Phillips 66 ranks #486 out of 1036 companies for WACC %. This puts Phillips 66 in the upper half of its industry. The industry median WACC % is 7.40. Phillips 66's value of 3.37% is 54.5% below this benchmark. Historically, Phillips 66's own WACC % has ranged from 6.52 to 10.52 over the past decade. While the company's 10-year median is 8.00 vs. the industry median of 7.40, Phillips 66 has consistently been below the industry average. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good WACC % for an Oil & Gas company?
The median WACC % among Oil & Gas companies is 7.40, based on 1,036 companies in the industry. Companies in the top quartile (top 25%) have a WACC % significantly above this median, while those in the bottom quartile fall well below. However, WACC % should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Phillips 66's current WACC % of 3.37% is 54.5% below the industry median. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high WACC % mean?
A high WACC % can signal that a stock is expensive relative to its fundamentals. The weighted average cost of capital (WACC) is the average rate a company pays to finance assets. View historical data on Phillips 66 and its competitors. For the Oil & Gas industry, the median WACC % is 7.40 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Phillips 66's current WACC % is 3.37%, which is 58% below median its own 10-year median of 8.00. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Phillips 66 stock overvalued right now?
Based on GuruFocus' analysis, Phillips 66 (MEX:PSX) is currently considered Modestly Overvalued. The stock's GF Value™ is MXN2,508.61, compared to a current price of MXN3,169.00 — trading 26.3% above its estimated fair value. The current WACC % is 3.37%, which is 58% below median its 10-year median of 8.00 and 54.5% below the Oil & Gas industry median of 7.40. Phillips 66's overall GF Score™ is 66/100 with 6 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is WACC % calculated?
WACC % is calculated from a company's financial statements. For Phillips 66 (MEX:PSX), the current WACC % is 3.37% as of Jun. 27, 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
Is Phillips 66 (MEX:PSX) Overvalued in 2026?
Based on GuruFocus' analysis, Phillips 66 stock appears to be overvalued.
The current stock price of MXN3,169.00 is trading 26.3% above its estimated GF Value™ of MXN2,508.61.
GuruFocus considers Phillips 66 to be Modestly Overvalued.
Key valuation signals for MEX:PSX:
WACC %: 3.37% (58% below median its 10-year median of 8.00)
GF Value™: MXN2,508.61 vs. price of MXN3,169.00 (26.3% above fair value)
Industry Position: 54.5% below the Oil & Gas median (#486 of 1036)
No single metric tells the full story. See the MEX:PSX stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Phillips 66 is an independent refiner that owns or holds interest in 10 refineries with a total crude throughput capacity of 2.0 million barrels per day, or mmb/d, at the end of 2025. The midstream segment comprises extensive transportation and NGL processing assets. It includes 70,000 miles of crude oil, refined petroleum product, NGL and natural gas pipeline systems, and a comprehensive set of refined petroleum product, NGL and crude oil terminals, gathering and processing plants and fractionation facilities and various other storage and loading facilities. Its CPChem chemical joint venture operates facilities primarily in the United States and the Middle East and produces olefins and polyolefins.
66GF Score
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