SAFE calculator

SAFE ownership calculator for post-money SAFE math

Estimate the ownership percentage implied by a post-money SAFE before it becomes a cap table surprise.

Quick answer

SparkLaunch estimates post-money SAFE ownership from the investment and valuation cap, shows a discount-adjusted reference valuation as a comparison proxy, and models optional pool dilution. Use the signed SAFE and current cap table for any real financing decision.

Formula

Post-money SAFE ownership = investment amount / post-money valuation cap.

Example

A $100,000 SAFE with a $5,000,000 post-money valuation cap implies 2.0% ownership before considering other financing effects and future round terms.

Calculate post-money SAFE ownership

Free - no sign-in required

Estimate cap-implied ownership and optional pool dilution. The discount-adjusted valuation is a comparison proxy only and is not used to calculate ownership. Results update as you type.

SAFE and scenario inputs

SAFE investment amount

Post-money valuation cap

Discount

Optional; pair with the reference valuation.

Reference priced-round pre-money valuation

Optional simplified valuation proxy.

Additional option-pool dilution

Optional scenario after SAFE conversion.

Cap-implied ownership

2.00%

Investment divided by the post-money valuation cap.

Discount-adjusted reference proxy

$9,600,000

For comparison only; exact conversion requires share-price and capitalization terms.

Modeled pool dilution

10.00%

An optional simplified dilution scenario.

Cap ownership after pool

1.80%

10.00% modeled pool dilution.

In this simplified post-pool view, existing holders retain 88.20% and the option pool represents 10.00%.

This educational estimate models one post-money SAFE. Ownership percentages use only the post-money cap; the discount calculation is a valuation proxy, not an ownership or conversion estimate. Exact discount conversion depends on priced-round share price and document-defined capitalization. This tool does not model multiple SAFEs or notes, pre-money SAFEs, MFN or pro-rata rights, priced-round new money, option-pool top-up mechanics, or liquidation terms. Review the signed documents and current cap table with qualified legal and tax counsel. This is not legal, tax, investment, or financial advice.

Inputs

Investment amount
Post-money valuation cap
Discount and reference round valuation
Additional option-pool dilution

Outputs

Cap-implied ownership
Discount-adjusted reference valuation proxy
Cap-based ownership after option-pool dilution

SparkLaunch workflow

Save SAFE terms
Model dilution
Attach documents
Prepare investor-ready cap table exports

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