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carta-conversion-calculator

Calculate SAFE and convertible note conversions using Carta cap table data.

12|16|Updated Mar 26, 2026
Search Tags:#cap table#carta#safe conversion#convertible note conversion#financing close#equity conversion#conversion math
One-click install
npx skills add https://github.com/carta/plugins --skill carta-conversion-calculator
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: carta-conversion-calculator
Source: https://github.com/carta/plugins/tree/main/plugins/carta-cap-table/skills/carta-conversion-calculator
Command: npx skills add https://github.com/carta/plugins --skill carta-conversion-calculator

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Manually calculating how SAFEs and convertible notes convert to equity during a financing round is complex, error-prone, and requires deep expertise in cap table mechanics, leading to inaccurate ownership projections and potential compliance risks for stakeholders.

Core Features & Use Cases

  • Precise Conversion Math: Automatically calculates share counts for SAFEs and convertible notes using the most favorable applicable terms, including valuation caps, discount rates, and most favored nation (MFN) clauses.
  • Live Data Integration: Pulls real-time data directly from Carta, including outstanding instrument details, current fully diluted share counts, and 409A valuations, to ensure calculations are based on the latest official records.
  • Use Case: A startup finance lead preparing for a Series A close can use this skill to instantly model how $1.2M in outstanding SAFEs and $500K in convertible notes with accrued interest will convert at a proposed $45M pre-money valuation, including the impact on post-conversion ownership.

Quick Start

Provide your Carta corporation ID and the proposed pre-money valuation or price per share for the upcoming financing round to receive a full breakdown of all outstanding instrument conversions, per-instrument share counts, and post-conversion fully diluted share totals.

Frequently Asked Questions about carta-conversion-calculator

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I calculate SAFE and convertible note conversions during a financing round?▼

To calculate SAFE and convertible note conversions, you must apply valuation caps, discount rates, and accrued interest to proposed round pricing. This determines the exact equity shares issued per outstanding instrument at financing close.

What is needed to model convertible note impact on fully diluted shares?▼

Modeling convertible note impact requires outstanding instrument records, current fully diluted share counts, and proposed round pricing terms. Access to live cap table data ensures accurate, auditable conversion calculations for ownership projections.

How do I handle most favored nation clauses when converting SAFEs?▼

Handling most favored nation (MFN) clauses during SAFE conversion requires evaluating outstanding instruments to apply the most favorable terms automatically. This ensures compliant calculations by selecting the lowest effective valuation cap or highest applicable discount rate.

Can I use my existing Carta cap table data to compute equity conversion math?▼

Yes, you can use your Carta cap table data to compute equity conversion math by providing your corporation ID and proposed pre-money valuation. The system pulls live outstanding instrument details and current 409A valuations to output per-instrument share counts.

What causes inaccurate ownership projections during a Series A close?▼

Inaccurate ownership projections during a financing close are caused by manual errors in applying discount rates, accrued interest, and valuation caps to convertible instruments. Automating conversion math eliminates compliance risks and ensures precise fully diluted share totals.

How do I calculate post-conversion ownership percentages for outstanding convertible notes?▼

Calculating post-conversion ownership percentages requires dividing equity shares generated from convertible notes by the post-conversion fully diluted share count. Accrued interest and valuation caps directly adjust the effective share price to determine final ownership stakes.

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