Carta SAFE Calculator

What is a Carta SAFE Calculator?

A Carta SAFE calculator is a specialized financial tool designed to help founders, investors, and employees understand the conversion mechanics of a Simple Agreement for Future Equity (SAFE) into company stock. While "Carta" refers to a leading equity management platform, a "Carta SAFE calculator" specifically addresses the calculations involved in a SAFE agreement, which is a popular fundraising instrument for startups.

SAFEs are often used in early-stage financing as they are simpler and faster than traditional equity rounds. However, their conversion can be complex, involving factors like valuation caps and discount rates. This calculator simplifies that complexity, allowing users to project potential ownership and dilution. It's crucial for anyone involved in startup equity, from founders planning their cap table management to investors assessing their potential returns, and employees understanding their option pool impact.

Common misunderstandings about SAFEs often revolve around how the valuation cap and discount interact, or how they affect the effective share price. Many assume the cap is a fixed valuation, but it's actually a ceiling on the valuation used for conversion. Similarly, the discount isn't always straightforward; it applies to the price of the next qualified financing round. Our Carta SAFE calculator clarifies these dynamics, providing clear, unit-aware results.

SAFE Conversion Formula and Explanation

The core of a SAFE conversion lies in determining the effective price per share the SAFE investor receives. This is typically the lower of two prices: the Valuation Cap Price or the Discount Price.

Here's the breakdown of the formula used by this Carta SAFE calculator:

1. Calculate Next Round Price Per Share (P_nr): P_nr = Next Round Pre-Money Valuation / Current Fully Diluted Shares Outstanding This is the price per share that new investors in the next equity round will pay.
2. Calculate Valuation Cap Price Per Share (P_cap_per_share): P_cap_per_share = SAFE Valuation Cap / Current Fully Diluted Shares Outstanding This represents the maximum effective price per share the SAFE investor will pay, based on the cap.
3. Calculate Discount Price Per Share (P_discount_per_share): P_discount_per_share = P_nr * (1 - SAFE Discount Rate) This is the price per share the SAFE investor would pay if only the discount applied.
4. Determine SAFE Effective Price Per Share (P_safe): P_safe = min(P_cap_per_share, P_discount_per_share) The SAFE investor gets the better deal, so they convert at the lower of the two calculated prices.
5. Calculate Shares Received by SAFE Investor (S_safe): S_safe = SAFE Investment Amount / P_safe This is the total number of shares the SAFE converts into.
6. Calculate Shares for New Investors in Next Round (S_new): S_new = Next Round New Investment Amount / P_nr These are the shares issued to new investors participating in the priced round.
7. Calculate Total Shares Post-Money (S_post): S_post = Current Fully Diluted Shares Outstanding + S_safe + S_new This is the total number of shares in the company after the SAFE conversion and the new investment round.
8. Calculate SAFE Investor Ownership Percentage: Ownership % = (S_safe / S_post) * 100 This is the percentage of the company owned by the SAFE investor after the conversion.
9. Calculate Implied Post-Money Valuation (PMV): PMV = Next Round Pre-Money Valuation + Next Round New Investment Amount + SAFE Investment Amount This represents the total valuation of the company after all capital injections are considered.

Variables Table

Practical Examples of SAFE Conversion

Example 1: Valuation Cap is Hit (Cap Trumps Discount)

Let's consider a scenario where the company's valuation has grown significantly, making the valuation cap the more favorable conversion term for the SAFE investor.

• SAFE Investment Amount: $200,000
• SAFE Valuation Cap: $10,000,000
• SAFE Discount Rate: 20%
• Next Round Pre-Money Valuation: $20,000,000
• Next Round New Investment Amount: $5,000,000
• Current Fully Diluted Shares Outstanding: 10,000,000 shares

Calculation Steps:

1. Next Round Price Per Share (P_nr) = $20,000,000 / 10,000,000 shares = $2.00/share
2. Valuation Cap Price Per Share (P_cap_per_share) = $10,000,000 / 10,000,000 shares = $1.00/share
3. Discount Price Per Share (P_discount_per_share) = $2.00 * (1 - 0.20) = $1.60/share
4. SAFE Effective Price Per Share (P_safe) = min($1.00, $1.60) = $1.00/share
5. Shares Received by SAFE Investor (S_safe) = $200,000 / $1.00 = 200,000 shares
6. Shares for New Investors (S_new) = $5,000,000 / $2.00 = 2,500,000 shares
7. Total Shares Post-Money (S_post) = 10,000,000 + 200,000 + 2,500,000 = 12,700,000 shares
8. SAFE Investor Ownership Percentage: (200,000 / 12,700,000) * 100 = 1.57%

In this example, the Valuation Cap provided a lower effective share price for the SAFE investor, demonstrating how a startup valuation method can significantly impact conversion.

Example 2: Discount Rate is Applied (Discount Trumps Cap)

Now, let's look at a scenario where the next round's valuation is lower, making the discount rate the more beneficial term for the SAFE investor.

• SAFE Investment Amount: $200,000
• SAFE Valuation Cap: $10,000,000
• SAFE Discount Rate: 20%
• Next Round Pre-Money Valuation: $8,000,000
• Next Round New Investment Amount: $2,000,000
• Current Fully Diluted Shares Outstanding: 10,000,000 shares

Calculation Steps:

1. Next Round Price Per Share (P_nr) = $8,000,000 / 10,000,000 shares = $0.80/share
2. Valuation Cap Price Per Share (P_cap_per_share) = $10,000,000 / 10,000,000 shares = $1.00/share
3. Discount Price Per Share (P_discount_per_share) = $0.80 * (1 - 0.20) = $0.64/share
4. SAFE Effective Price Per Share (P_safe) = min($1.00, $0.64) = $0.64/share
5. Shares Received by SAFE Investor (S_safe) = $200,000 / $0.64 = 312,500 shares
6. Shares for New Investors (S_new) = $2,000,000 / $0.80 = 2,500,000 shares
7. Total Shares Post-Money (S_post) = 10,000,000 + 312,500 + 2,500,000 = 12,812,500 shares
8. SAFE Investor Ownership Percentage: (312,500 / 12,812,500) * 100 = 2.44%

In this case, the discount provided a lower price, leading to more shares for the SAFE investor. This demonstrates the importance of analyzing the safe agreement valuation for both founders and investors.

How to Use This Carta SAFE Calculator

Our Carta SAFE calculator is designed for ease of use, providing clear and accurate projections for your SAFE conversions.

1. Input SAFE Investment Amount: Enter the total dollar amount the SAFE investor initially put into the company.
2. Input SAFE Valuation Cap: Provide the maximum valuation at which the SAFE will convert. This is a crucial term in a SAFE agreement valuation.
3. Input SAFE Discount Rate: Enter the percentage discount (e.g., 20 for 20%) that the SAFE investor receives on the next round's share price.
4. Input Next Round Pre-Money Valuation: This is the valuation of your company immediately before the next equity financing round.
5. Input Next Round New Investment Amount: Enter the total capital raised from new investors in the upcoming equity round.
6. Input Current Fully Diluted Shares Outstanding: Provide the total number of shares currently in existence, including all common stock, preferred stock, and any shares reserved for unexercised options or warrants.
7. Click "Calculate SAFE": The calculator will instantly process your inputs and display the results.
8. Interpret Results:
   • SAFE Investor's Ownership Percentage: This is the primary result, showing the percentage of the company the SAFE investor will own post-conversion.
   • Effective Price Per Share for SAFE Investor: The actual price per share the SAFE investor effectively paid.
   • Shares Received by SAFE Investor: The total number of shares the SAFE converts into.
   • Total Shares Post-Money: The total number of shares outstanding after the SAFE conversion and the new investment.
   • Implied Post-Money Valuation: The estimated total valuation of the company after all new capital.
   • Next Round Price Per Share: The price per share paid by new investors in the priced round.
9. Use the Chart and Table: The dynamic chart and table below the calculator provide visual and tabular insights into how ownership changes across different valuation scenarios, helping you visualize the impact of your understanding dilution.
10. Copy Results: Use the "Copy Results" button to easily transfer all calculated values to a spreadsheet or document for further analysis.

Key Factors That Affect SAFE Conversion

Understanding the variables that influence a SAFE conversion is critical for both founders and investors. Here are the key factors:

1. SAFE Investment Amount ($): A larger initial SAFE investment will naturally result in more shares for the investor, assuming the same effective price per share. This directly scales the number of shares received.
2. SAFE Valuation Cap ($): This is a ceiling on the valuation at which the SAFE converts. If the company's next round valuation exceeds the cap, the SAFE converts at a lower, cap-derived price, giving the investor more shares. A lower cap is more favorable to the SAFE investor.
3. SAFE Discount Rate (%): This offers the SAFE investor shares at a discount to the next round's price. A higher discount rate (e.g., 25% vs. 15%) leads to a lower effective price per share and thus more shares for the investor, particularly if the valuation cap is not triggered.
4. Next Round Pre-Money Valuation ($): This is perhaps the most significant external factor. A higher next round pre-money valuation means a higher price per share for new investors. If this valuation is very high, it makes the valuation cap more likely to apply to the SAFE conversion, benefiting the SAFE investor. If it's lower, the discount might kick in. This is key to understanding startup valuation methods.
5. Next Round New Investment Amount ($): While it doesn't directly affect the SAFE's conversion price per share, a larger new investment amount means more new shares are issued in the priced round. This increases the total post-money share count, which can dilute all existing shareholders, including the SAFE investor post-conversion.
6. Current Fully Diluted Shares Outstanding (Shares): This number is crucial as it's used to calculate the price per share for both the valuation cap and the next round. A higher number of existing shares will lower the price per share derived from a fixed valuation (either cap or pre-money valuation), potentially increasing the shares received by the SAFE investor.
7. Timing of Conversion: While not a direct input, the timing of the next priced round can indirectly affect the "Next Round Pre-Money Valuation." Delays or rapid growth can significantly alter this crucial input.

Frequently Asked Questions (FAQ) about SAFE Conversion