Decision calculator
SAFE Ownership Calculator
Estimate post-money SAFE ownership with valuation cap, discount, other SAFEs, and the next priced round, including founder dilution and a cap sensitivity table.
Modeled result
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Results update as you change the inputs.
Methodology and assumptions
For a post-money SAFE, ownership at conversion ≈ investment ÷ effective valuation, where effective valuation = the cap, or pre-money × (1 − discount) when a discount is set and gives a lower price. All SAFEs together take (all SAFE money) ÷ cap, which is the founders' SAFE dilution. New-round investors then take round size ÷ (pre-money + round size), diluting all prior holders proportionally. This approximates the YC post-money SAFE; pro rata rights, MFN terms, and option-pool top-ups can change real outcomes. Review the signed instrument.
Currency outputs are rounded to the nearest minor currency unit.
Pricing last verified:
Frequently Asked Questions
What does the SAFE Ownership Calculator calculate?
Estimate post-money SAFE ownership with valuation cap, discount, other SAFEs, and the next priced round, including founder dilution and a cap sensitivity table.
How accurate is the SAFE Ownership Calculator?
It is a planning estimate based on the inputs, formula, assumptions, and sources shown on this page. Actual prices, invoices, taxes, discounts, and outcomes can differ.
Which pricing source does the SAFE Ownership Calculator use?
The calculator links to Y Combinator SAFE documents as its official source. The displayed pricing or reference data was last verified on 2026-10-01.
Are calculator inputs saved or sent to analytics?
Inputs are processed in your browser. Calculator values are not included in analytics events.