What is price per share?
Price per share tells you the implied value of a single ownership unit in a company. It is one of the most versatile numbers in finance because it bridges three different contexts — each using the same formula with different inputs:
- Public markets — PPS is the live trading price, determined by supply and demand. Market cap = PPS × shares outstanding.
- Private companies and startups — PPS is derived from the most recent post-money valuation divided by the fully diluted share count. This is the price per share on the cap table.
- Transactions and acquisitions — PPS is the total deal value paid for equity divided by the number of shares acquired. This is the effective purchase price per share.
In all three cases the arithmetic is identical: divide total equity value by the number of shares. What changes is which equity value figure and which share count you use. The calculator works across all three contexts.
Price per share formula
The calculator uses four formulas built from two required inputs:
Value of Stake = Shares Owned × Price Per Share
Implied Shares = (Ownership % ÷ 100) × Shares Outstanding
Ownership Value = (Ownership % ÷ 100) × Company Value
Full valuation waterfall — public company preset
Default preset: $25M company value · 5M shares outstanding · 1,000 shares owned · 0.02% ownership:
The stake value and ownership value rows confirm each other: 0.02% of 5M shares = 1,000 shares, and 1,000 × $5 = $5,000 = 0.02% × $25M. When they match, the cap table math is consistent.
Basic shares vs fully diluted shares
The most important input decision in price per share calculation is which share count to use. There are two versions — and using the wrong one can significantly change the implied PPS:
How to calculate price per share — step by step
Worked examples
Three scenarios aligned with the calculator's three presets.
$25M market cap · 5M shares · 1,000 owned
Standard listed company — basic shares with market cap.
✓ Stake value and ownership value confirm each other.
$12M post-money · 8M diluted shares · 25K owned
Early-stage startup — fully diluted shares with post-money valuation.
→ Note: startup PPS is theoretical — not a liquidation guarantee due to preferred stock preferences.
$3.75M value · 15M shares · $0.25 PPS
Large share count creates low nominal share price — sub-$1 is common in micro-caps.
→ Share price alone never indicates company size — always look at total market cap.
Same $12M value — shares grow from 8M → 10M
New shares issued in a follow-on round — what happens to PPS?
→ Dilution reduces PPS unless the new round raises valuation proportionally.
Common mistakes to avoid
- Using enterprise value instead of equity value. Enterprise value includes debt and subtracts cash — it is a measure of the whole business, not just what equity holders own. Price per share must use equity value (market cap for public companies, or post-money valuation for startups) as the numerator.
- Using basic shares when fully diluted is appropriate. Options and warrants that haven't vested yet are not counted in basic shares — but they will dilute ownership when exercised. In startup contexts, always use fully diluted share counts to understand real ownership percentages.
- Using an outdated share count. Share counts change after stock splits, buybacks, new issuances, and option vesting. Always use the share count as of the same date as the valuation figure. For public companies, the most recent 10-Q or 10-K is the source.
- Confusing a higher share price with a more valuable company. A $500 share price can represent a smaller company than a $5 share price if the share counts differ by 100×. Total market cap is the correct measure of size. Two companies can have identical market caps with very different PPS.
- Mixing pre-money and post-money valuations in startup contexts. Post-money valuation = pre-money + new investment. Using pre-money with the new total share count (which includes newly issued shares) overstates PPS. Always use post-money valuation with the post-round fully diluted share count.
- Treating startup PPS as a liquidation value. Preferred shareholders in a startup often have liquidation preferences — they get paid first in an exit before common shareholders see any proceeds. A $1.50 PPS on a cap table does not mean common shares are worth $1.50 in a sale unless proceeds exceed the preferred stack.
FAQ
What is the price per share formula?
Price Per Share = Company Value (or Market Cap) ÷ Shares Outstanding. Value of Stake = Shares Owned × Price Per Share. Implied Shares = (Ownership% ÷ 100) × Shares Outstanding. Ownership Value = (Ownership% ÷ 100) × Company Value.
Is price per share the same as earnings per share?
No. Price per share is a valuation metric — it measures what the market or a transaction assigns as the value of one share. Earnings per share (EPS) is an accounting metric — it measures how much of the company's net profit is allocated to each share. The two are related through the P/E ratio (PPS ÷ EPS), but they measure different things.
Should I use basic or fully diluted shares?
For public companies deriving share price from market cap: use basic shares outstanding. For startups and cap table analysis: use fully diluted shares (including all options and warrants). Fully diluted is more conservative and reflects what ownership would be after maximum dilution.
Why can two companies have very different share prices but the same market cap?
Because share price depends on share count. A $10M company with 1M shares has a $10 PPS. The same company with 100M shares has a $0.10 PPS. Both are equally valuable — share price alone tells you nothing about company size. Always compare market cap, not share price, when evaluating company value.
What happens to price per share when a startup issues new shares?
If the valuation rises proportionally to the new shares, PPS stays the same. If valuation stays flat but more shares are issued, PPS falls — this is dilution. In a well-structured up-round, the new valuation typically exceeds dilution so existing shareholders see both a higher PPS and a lower ownership percentage.
Can I use this calculator for startup cap table analysis?
Yes — enter the post-money valuation and fully diluted share count. Then add shares owned or an ownership percentage to see stake values. Remember that the implied PPS reflects the round valuation, not a guaranteed liquidation value, due to preferred stock preferences that exist above common shares in most startup cap tables.