How to Calculate the Price-to-Book Ratio from Common Equity

Start with the common shareholders' claim

A company can have several equity figures on its balance sheet. P/B is most interpretable when the market price and book denominator refer to the same common shareholders.

What market-to-book compares

P/B compares market value for common shareholders with the corresponding accounting book equity. Book value per share is common book equity divided by the relevant period-end common shares.

Book value is an accounting measure at a reporting date. It depends on what the accounts recognize and how they measure assets and liabilities.

Reconcile a reported P/B ratio

Record the listing, quote date, book reporting date, common equity scope, share basis and currency units. Check whether the source uses corporate book value, tangible book or a fund's NAV before comparing figures.

Price-to-book formula

Divide positive common share price by positive common book value per share, or divide positive common market capitalisation by positive common book equity. Use matched currency units and common equity coverage.

P/B = common share price ÷ common book value per share

Reconcile two verified input modes

A common share price of 15 and book value of 10 per share give 1.50×. If the same 20 million common shares underlie both values, common market cap of 300 million and book equity of 200 million also give 1.50×.

1. Divide 15 by 10 for 1.50× per share.
2. Multiply both inputs by the same 20 million shares to obtain matched totals.
3. Divide 300 million by 200 million for 1.50× in aggregate mode.

Choose the correct equity and share figures

Choose per-share figures or aggregate common equity. Enter positive market value and signed common book value. Switching input basis clears both fields. Note the quote date and balance-sheet date.

When calculating book value per share, start with the reported common book amount and shares outstanding on the same reporting basis. A fresh market price can reflect changes after the balance sheet, so check disclosures about material events.

Interpret zero, deficits and low multiples

Zero book value makes P/B undefined. A book deficit gives no meaningful conventional P/B multiple. A positive ratio below one means the market value is below the supplied accounting value. Assess the reasons before drawing any valuation conclusion.

A small positive denominator can yield a large multiple. Review what is in book equity and how stable it is before comparing across firms.

Compare P/B with P/E and tangible book

P/E uses earnings, whereas P/B uses an equity balance. Tangible book applies separately defined adjustments. Enterprise value covers other capital claims and would mismatch a common equity denominator.

Match common equity coverage

Use the same issuer, common equity coverage and currency scale. Start with equity attributable to common holders, after any applicable exclusions. Check for share issues, buybacks and splits between the reporting date and quote date.

Consolidated total equity can include noncontrolling interests. Parent equity can still include preferred claims. Use a common-attributable figure or reconcile those amounts outside the calculator, avoiding deductions already made in the disclosure.

Input limits and rounding

Use up to 48 trimmed characters and 12 fractional places, with magnitude at most 10^15. Positive multiples can range from 10^−27 to 10^27. Display rounds half-even to two decimals and marks small positive values that would round to zero.

The calculator does not validate your dates, accounting policy, share class or currency. Enter matched data and check the source disclosures.

Avoid unit and denominator mismatches

Avoid total assets, enterprise value, float-only market cap, diluted EPS shares and duplicate deductions for preferred equity or noncontrolling interests. Keep total units and share units consistent.

For example, 1,500 pence per share and GBP 10 book per share give 1.50× after converting the quote to GBP 15. Dividing 1,500 by 10 directly would overstate the multiple by 100 times.

Check units in five markets

Use matching USD, GBP, CAD, AUD or INR figures for US, UK, Canadian, Australian and Indian listings. Canadian issuers can report in USD, and a UK source can state aggregate figures in pounds and per-share figures in pence. Convert amounts to the same unit before entry.

For Indian aggregates, use the same lakh or crore scale on both sides. The NSE index methodology has aggregation rules. A published ASX issuer example reports market-to-book separately from tangible asset backing.

Educational scope

Educational multiple from supplied inputs. No live prices, currency conversion, accounting adjustments, tangible book, liquidation proceeds, target prices or personalized investment advice.

Frequently asked questions

Sources and review

Sources reviewed Nov 9, 2026. Consult current local rules before relying on time-sensitive information.

• Damodaran: valuation definitions
• SEC-filed book value example
• Fairfax interim report
• London Stock Exchange issuer disclosure
• ASX issuer results
• NSE index methodology