Convertible Note & Cap Table Math Guide for Alabama

What this calculator does

DocketMath’s Convertible Note & Cap Table Math Guide for Alabama (calculator name: convertible-note-cap-table) helps founders and finance teams model how a convertible promissory note can convert into equity—and what that does to a post-money cap table.

Specifically, it’s designed to answer common “cap table math” questions:

• How many shares will the note convert into under the chosen terms?
• What is the investor’s ownership % after conversion?
• How conversion interacts with:

  • a discount rate (e.g., 20%),
  • a valuation cap (e.g., $5,000,000),
  • the next priced equity round (e.g., Series Seed at $2.50/share),
  • any pre-money capitalization already on the cap table.

In practice, you’ll use it to keep your ownership math consistent so you can:

• draft term sheets with confidence,
• reconcile founder/investor expectations,
• sanity-check spreadsheet math before you circulate drafts.

When to use it

Use DocketMath when you’re dealing with the most typical Alabama venture financing workflows where conversion math matters—especially where someone will need a clean answer quickly:

1) You’re modeling conversion into a priced equity round

If your note converts upon a “qualified financing” or similar trigger, you’ll need to compute an effective conversion price using:

• the valuation cap and/or
• the discount to the new round’s price.

2) You’re building (or correcting) a cap table

Cap table errors are painful because they compound. The calculator is best when:

• you have a known existing share count / option pool,
• you need to add the note conversion line item correctly,
• you want investor ownership percentages that tie out to share counts.

3) You’re comparing alternative note terms

You can run side-by-side scenarios:

• cap vs. no cap,
• discount 15% vs. 25%,
• different next-round prices,
• different invested amounts.

4) You’re cleaning up “almost right” spreadsheets

If your spreadsheet currently:

• rounds shares inconsistently,
• uses the wrong base (pre-money vs. post-money),
• mixes per-share math with valuation math incorrectly,

…the DocketMath workflow typically gives you a better, auditable structure.

Step-by-step example

Below is a concrete example you can replicate in DocketMath. We’ll model a convertible note that converts into a Series Seed priced round in Alabama.

Scenario setup (note + next round)

Convertible note terms

• Principal (amount invested): $500,000
• Valuation cap: $5,000,000
• Discount rate: 20%
• Note is converting in the next priced round (qualified financing)

Next priced round details

• Next round’s price per share: $2.00/share
• Company has:

  • Current issued shares (fully diluted, excluding the note conversion): 10,000,000
  • Option pool: 0 (for simplicity in this example)

Step 1: Compute the “discount conversion price”

Discount conversion price is usually based on the next round price:

• Next round price: $2.00/share
• Discount: 20%
• Discounted price = $2.00 × (1 − 0.20) = $1.60/share

Step 2: Compute the “cap-based conversion price”

Cap-based conversion turns the cap into an implied per-share price using the share base for that round.

A common modeling approach is:

• Implied conversion price = Valuation cap ÷ (shares outstanding at conversion)

Using our example:

• Valuation cap = $5,000,000
• Shares outstanding base = 10,000,000

Implied cap price = $5,000,000 ÷ 10,000,000 = $0.50/share

Step 3: Choose the better conversion price for the noteholder

In most standard convertible note structures with both cap and discount, the noteholder converts using the more favorable price (lower per-share price), so:

• Discount price: $1.60/share
• Cap price: $0.50/share
• Note converts at $0.50/share

Step 4: Convert note principal to number of shares

Shares issued = Principal ÷ Conversion price

• Principal = $500,000
• Conversion price = $0.50/share

Shares from note conversion = $500,000 ÷ $0.50 = 1,000,000 shares

Step 5: Update the post-conversion cap table totals

Post-conversion shares outstanding:

• Existing shares: 10,000,000
• Plus note conversion shares: 1,000,000
• Total post-conversion shares: 11,000,000

Investor ownership %:

• Investor shares: 1,000,000
• Ownership = 1,000,000 / 11,000,000 = 9.09%

What you should see in DocketMath

When you enter those inputs in DocketMath’s tool—via the primary CTA /tools/convertible-note-cap-table—your outputs should provide:

• calculated conversion price (cap vs. discount comparison),
• resulting converted shares,
• post-money (or post-conversion) share totals,
• investor ownership percentage.

Common scenarios

Convertible notes don’t all convert the same way. Here are frequent modeling scenarios and how the calculator output will change.

Scenario A: Cap alone (no discount)

Inputs

• Valuation cap: set
• Discount: 0%

Output behavior

• The discounted price won’t be used.
• Conversion price effectively equals cap-implied price.
• Investor gets more shares when the cap is low relative to the next round price.

Quick check

• If the next round price is high (e.g., $3.00/share) and the cap implies a lower price, conversion favors the noteholder.

Scenario B: Discount alone (no cap)

Inputs

• Valuation cap: 0 or not applied
• Discount: set (e.g., 25%)

Output behavior

• Conversion price = next round price × (1 − discount).
• Investor ownership increases with larger discount rates.

Quick check

• A 25% discount makes conversion price 0.75× the new round price.

Scenario C: Both cap and discount present

Inputs

• Valuation cap: set
• Discount: set

Output behavior

• Calculator selects the lower conversion price between cap-implied price and discounted price.
• Shares issued can jump substantially when the cap is much lower than the discount-implied price.

Practical note

• Many teams prefer to verify: “Which mechanism wins?” because that explains the ownership outcome.

Scenario D: Multiple notes

Inputs

• Repeat note principal + terms per investor/note.

Output behavior

• Each note converts into its own share count.
• Final ownership reflects the combined dilution impact across all notes.

Recommended workflow

• Use DocketMath to calculate each note’s conversion shares, then sum and update totals.

Scenario E: Rounding and fractional shares

Convertible math can produce fractional shares depending on inputs. Different systems handle this differently:

• round to whole shares,
• keep decimals internally and round at issuance,
• calculate per-share based on a fixed share unit.

What to do

• Align your rounding method across models and the draft conversion language.
• If your cap table must match a filing or equity plan standard, confirm the rounding convention before finalizing.

Scenario F: Existing cap table includes option pool or “fully diluted” assumptions

Some cap table inputs represent:

• only issued common,
• or “fully diluted” including options and warrants.

Output behavior

• The cap-implied per-share price often changes if your share base includes options.
• That can affect whether the cap is “binding.”

Reference table: how inputs typically affect outputs

Tips for accuracy

A few disciplined habits will make your DocketMath outputs more reliable and easier to defend internally.

1) Treat your “share base” as a first-class input

Because cap-to-price conversion often depends on the share base, confirm you’re using the same logic everywhere:

• “issued shares” only vs. “fully diluted”
• whether option pool is included
• whether conversion is modeled pre- or post-money

Checklist

2) Use per-share price units consistently

Common errors come from mixing:

• valuation cap (dollars)
  with
• next round price per share (dollars/share)

DocketMath’s calculator helps by structuring those steps, but you still need consistent inputs.

Related

Sources and references

Start with the primary authority for Alabama and confirm the effective date before relying on any output. If the rule has been amended, update the inputs and rerun the calculation.

• Ala. Code § 8-8-1

Related reading

• Inputs you need for convertible note cap table math in United States (Federal) — Input checklist with sourcing guidance
• Worked example: convertible note cap table math in North Carolina — Worked example with real statute citations
• Convertible note cap table math in California — Full how-to guide with jurisdiction-specific rules