How much capital should I raise on a SAFE note?

Founders should calculate their net monthly burn rate multiplied by their desired runway in months (typically 18 to 24 months), plus an additional 15% to 20% contingency buffer to ensure they reach their key business milestones without running out of capital prematurely.

What is the difference between Pre-Money and Post-Money SAFEs?

A Pre-Money SAFE calculates investor ownership after adding all other SAFEs and option pool expansions at the priced round, making exact dilution unpredictable. A Post-Money SAFE fixes the exact percentage of ownership the investor purchases upon signing, giving founders complete ownership transparency.

Equity Dilution & Capital Sizing Engine

SAFE Note & Dilution Runway Calculator

Determine exactly how much capital to raise on a Post-Money SAFE to achieve your 18 or 24-month runway goal, and model founder equity dilution.

Fundraising & Valuation Parameters

Current Cash ($)

Net Monthly Burn ($)

Target Runway Months: 18 months

Post-Money SAFE Valuation Cap ($)

Standard Y Combinator Post-Money SAFE valuation cap.

Recommended SAFE Raise

$299,000

Includes $260,000 core capital + 15% contingency buffer to secure 18 months.

Extended Runway:19.9 months

Founder Dilution5.98%Equity given to SAFE investors

Remaining Ownership94.02%Retained by founding team

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SAFE Note & Dilution Frequently Asked Questions

Everything you need to know about cash runway, burn rates, and financial planning.

Under the standard Y Combinator Post-Money SAFE, founder dilution is calculated directly as: Dilution (%) = Investment Amount ÷ Post-Money Valuation Cap. For example, raising $500,000 on a $5,000,000 post-money valuation cap dilutes existing shareholders by exactly 10.0%.