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National GridCHIX:NGL +3.16%73 Graham Number is £9.09 as of Mar. 2026, which is 100% below its 10-year median of 1.37. GuruFocus rates CHIX:NGL with a GF Score™ of 73/100 and a GF Value™ of £7.46 (Significantly Overvalued). The stock has 7 warning signs investors should review. Among 417 Utilities - Regulated companies, National Grid ranks worse than 61.39% on this metric.
Graham Number is a figure that measures a stock's fundamental value by taking into account the company's earnings per share and book value per share. The Graham number is the upper bound of the price range that a defensive investor should pay for the stock. According to the theory, any stock price below the Graham number is considered undervalued, and thus worth investing in.
As of today (2026-07-20), the stock price of National Grid is £12.55. National Grid's graham number for the quarter that ended in Mar. 2026 was £9.09. Therefore, National Grid's Price to Graham Number ratio for today is 1.38.
The historical rank and industry rank for National Grid's Graham Number or its related term are showing as below:
CHIX:NGl'
s Price-to-Graham-Number Range Over the Past 10 Years
Min: 1.16 Med: 1.37 Max: 1.82
Current: 1.38
During the past 13 years, the highest Price to Graham Number ratio of National Grid was 1.82. The lowest was 1.16. And the median was 1.37.
CHIX:NGl's Price-to-Graham-Number is ranked worse than 61.39% of 417
companies
in the Utilities - Regulated industry
Industry Median: 1.13
vs CHIX:NGl: 1.38
Graham Number is a combination of asset valuation and earnings power valuation. It is a very conservative way of valuing a stock.
National Grid (CHIX:NGl) Graham Number Explanation
Ben Graham actually did not publish a formula like this. But he wrote in The Intelligent Investor (1948 version) regarding to the criteria for purchases:
Current price should not be more than 15 times average earnings of the past three years.
Current price should not be more than 1.5 times the book value last reported. However, a multiplier of earnings below 15 could justify a correspondingly higher multiplier of assets. As a rule of thumb we suggest that the product of the multiplier times the ratio of price to book value should not exceed 22.5. (This figure corresponds to 15 times earnings and 1.5 times book value. It would admit an issue selling at only 9 times earnings and 2.5 times asset value, etc.)
Unlike valuation methods such as DCF or Discounted Earnings, the Graham number does not take growth into the valuation. Unlike the valuation methods based on book value alone, it takes into account the earnings power. Therefore, the Graham Number is a combination of asset valuation and earnings power valuation.
In general, the Graham number is a very conservative way of valuing a stock. It cannot be applied to companies with negative book values.
National Grid's Price to Graham number Ratio for today is calculated as
Price to Graham number
=
Share Price (Today)
/
Graham number (Q: Mar. 2026 )
=
12.55
/
9.09
=
1.38
* 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.
Be Aware
Please keep these in mind:
1. Graham Number does not take growth into account. Therefore it underestimates the values of the companies that have good earnings growth. We feel that if the earnings per share grows more than 10% a year, Graham Number underestimates the value.
2. Graham Number punishes the companies that have temporarily low earnings. Therefore, an average of earnings makes more sense in the calculation of Graham Number.
3. Graham Numbers underestimates companies that are light with book.
National Grid Graham Number Related Terms
National Grid Graham Number Historical Data
* Premium members only.
The historical data trend for National Grid's Graham Number 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.
CHIX:NGL vs NEE, SO, DUK: Graham Number Comparison
For the Utilities - Regulated Electric subindustry, National Grid's Price-to-Graham-Number, along with its competitors' market caps and Price-to-Graham-Number 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.
National Grid Price-to-Graham-Number vs Utilities - Regulated Industry
For the Utilities - Regulated industry and Utilities sector, National Grid's Price-to-Graham-Number distribution charts can be found below:
* The bar in red indicates where National Grid's Price-to-Graham-Number falls into.
* 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.
National Grid (CHIX:NGL) has a Graham Number of £9.09 as of Mar. 2026. The Graham Number values a company based on its per-share earnings and book value. View historical data on National Grid and its competitors. This is 564% above median its historical median of 1.37. Over the past decade, National Grid's Graham Number has ranged from 1.16 to 1.82. According to the industry distribution chart, National Grid ranks #256 out of 417 companies in the Utilities - Regulated industry, placing it in the top 61.4%.
Is National Grid's Graham Number too high?
National Grid's current Graham Number of £9.09 is 564% above median its 10-year median of 1.37. Over the past 10 years, this metric has ranged from a low of 1.16 to a high of 1.82. Based on the distribution chart, National Grid ranks #256 out of 417 companies in the Utilities - Regulated industry, which is below the industry midpoint. Overall, National Grid has a GF Score™ of 73/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does National Grid's Graham Number compare to NEE and SO?
According to the Utilities - Regulated industry distribution chart, National Grid ranks #256 out of 417 companies for Graham Number. This places National Grid in the lower half of its industry. The industry median Graham Number is 1.13. Historically, National Grid's own Graham Number has ranged from 1.16 to 1.82 over the past decade. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Graham Number for an Utilities - Regulated company?
The median Graham Number among Utilities - Regulated companies is 1.13, based on 417 companies in the industry. Companies in the top quartile (top 25%) have a Graham Number significantly above this median, while those in the bottom quartile fall well below. However, Graham Number should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Graham Number mean?
A high Graham Number can signal that a stock is expensive relative to its fundamentals. The Graham Number values a company based on its per-share earnings and book value. View historical data on National Grid and its competitors. For the Utilities - Regulated industry, the median Graham Number is 1.13 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. National Grid's current Graham Number is £9.09, which is 564% above median its own 10-year median of 1.37. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is National Grid stock overvalued right now?
Based on GuruFocus' analysis, National Grid (CHIX:NGL) is currently considered Significantly Overvalued. The stock's GF Value™ is £7.46, compared to a current price of £12.55 — trading 68.2% above its estimated fair value. The current Graham Number is £9.09, which is 564% above median its 10-year median of 1.37. National Grid's overall GF Score™ is 73/100 with 7 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Graham Number calculated?
Graham Number is calculated from a company's financial statements. For National Grid (CHIX:NGL), the current Graham Number is £9.09 as of Mar. 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 National Grid (CHIX:NGL) Overvalued in 2026?
Based on GuruFocus' analysis, National Grid stock appears to be overvalued.
The current stock price of £12.55 is trading 68.2% above its estimated GF Value™ of £7.46.
GuruFocus considers National Grid to be Significantly Overvalued.
Key valuation signals for CHIX:NGL:
Graham Number: £9.09 (564% above median its 10-year median of 1.37)
GF Value™: £7.46 vs. price of £12.55 (68.2% above fair value)
No single metric tells the full story. See the CHIX:NGL stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
National Grid owns and operates the electric transmission system in England and Wales. It sold the bulk of its UK gas transmission business in fiscal 2023 to fund the acquisition of PPL's UK power distribution assets. In the Northeastern United States, it serves electricity and gas customers combined in three states. It also owns regulated transmission electricity networks in the United States, metering services and merchant transmission lines in the UK.
73GF Score
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