Calculate post-money valuation, ownership percentages, and visualize dilution impact on your cap table. Essential for founders negotiating pre-money valuations and equity dilution.
Try an example:
INVESTORS (OPTIONAL)
CURRENT OWNERSHIP (%)
NEW OPTION POOL (OPTIONAL)
Formula:
Post-Money = Pre-Money + Investment
Investor % = Investment / Post-Money
Enter valuation details to calculate
Add pre-money valuation and investment amount
Post-money valuation represents the total value of a company immediately after an investment round closes. It is the single most important number in startup fundraising because it determines exactly how much ownership investors receive for their capital. Per Y Combinator's Guide to Seed Fundraising, understanding post-money valuation is essential for founders to negotiate fair terms and maintain appropriate ownership through multiple funding rounds.
The relationship between pre-money valuation and post-money valuation is straightforward: Post-Money = Pre-Money + Investment Amount. However, the implications of this calculation are profound. When an investor offers a $2 million investment at a $10 million post-money valuation, they are valuing the company at $8 million before their investment (pre-money) and will own exactly 20% of the company after closing.
According to Carta's startup data, median post-money valuations have increased significantly over the past decade, with seed rounds now averaging $10-15 million and Series A rounds reaching $40-60 million. These benchmarks help founders understand market expectations, but every company's circumstances are unique based on traction, market size, and competitive dynamics.
Founders must also consider the cumulative effect of multiple funding rounds. If you raise a seed round at $12 million post-money (giving away 20% equity) and a Series A at $50 million post-money (giving away another 25%), your combined equity dilution will be approximately 40%, leaving you with 60% of your original stake. Use the cap table changes calculator to model ownership across multiple rounds and plan for future financing events.
Post-Money Valuation = Pre-Money Valuation + Investment Amount
Investor ownership is calculated as:
Investor Ownership % = Investment Amount / Post-Money Valuation x 100
The pre-money valuation is what investors believe your company is worth before their investment. This is typically negotiated based on comparable company valuations, traction metrics, market opportunity, and team experience. Use our pre-money calculator to estimate this value.
Add the total investment to the pre-money valuation. If multiple investors participate, sum all their investments. For example: $8M pre-money + $2M investment = $10M post-money.
Divide each investor's contribution by the post-money valuation. A $2M investment in a $10M post-money company yields 20% ownership ($2M / $10M = 20%).
Price per share = Pre-Money Valuation / Total Shares Outstanding. This determines how many new shares investors receive. New shares issued = Investment / Price Per Share.
If investors require a new option pool, determine whether it comes from pre-money or post-money. Pre-money option pools (the "shuffle") effectively reduce founders' ownership more than post-money pools.
Understanding the distinction between post-money and pre-money valuation is critical for negotiation. Founders typically think in pre-money terms (what is my company worth today?), while investors often think in post-money terms (what percentage will I own?). This difference in perspective can lead to misunderstandings if not addressed explicitly during term sheet discussions.
A founder offers 20% equity for a $2M investment. What valuation are they implying?
Post-Money Perspective:
$2M / 20% = $10M post-money
Pre-money = $10M - $2M = $8M
Pre-Money Perspective:
Same result: $8M pre-money
Post-money = $8M + $2M = $10M
A pre-revenue SaaS startup with a strong team and promising MVP raises seed funding.
Pre-Money Valuation: $4,000,000
Investment Amount: $1,000,000
Post-Money Valuation: $5,000,000
Investor Ownership: 20% ($1M / $5M)
The founders retain 80% ownership, which is within Y Combinator's recommended range of 75-90% after seed. This gives investors meaningful upside while preserving founder control.
A B2B startup with $500K ARR and 3x year-over-year growth raises Series A.
Pre-Money Valuation: $20,000,000
Investment Amount: $5,000,000
Post-Money Valuation: $25,000,000
Investor Ownership: 20% ($5M / $25M)
Founders After Round: 64% (80% x 80%)
Combined with their seed round, founders now own 64% of the company. This aligns with Carta's data showing median founder ownership of 50-65% after Series A. Use our Series A calculator for detailed modeling.
A Series A round with a lead investor and two follow-on investors.
Pre-Money Valuation: $15,000,000
Lead Investor: $3,000,000 (15%)
Investor B: $1,500,000 (7.5%)
Investor C: $500,000 (2.5%)
Post-Money Valuation: $20,000,000
Total New Investor Ownership: 25%
Each investor's ownership is calculated independently against the same post-money valuation. The lead investor gets board representation, while smaller investors receive pro-rata rights.
Post-money valuations vary significantly by funding stage, sector, and market conditions. Use these benchmarks from Y Combinator, a16z, and Carta as general guidelines.
Idea stage, pre-product or MVP
Early traction, product-market fit signals
Proven product-market fit, scaling
Scaling operations, expanding market
Late stage growth, pre-IPO
While post-money valuation is essential for understanding ownership, it has limitations that founders and investors should consider when making decisions.
Post-money valuation is a negotiated number, not necessarily what the company would sell for today. Investors receive preferred stock with liquidation preferences and other protections that make their shares worth more than common stock held by founders.
A $10M post-money valuation with $2M invested doesn't mean founders have $8M in value. If investors have 1x participating preferred, they get their $2M back first, plus 20% of remaining proceeds. This can significantly reduce founder returns in modest exits.
When investors require a new option pool from pre-money valuation, the effective dilution to founders is higher than the stated investor percentage. A 20% round with a 10% pre-money option pool actually dilutes founders by nearly 28%.
Post-money valuation shows ownership after one round, but most startups raise multiple rounds. Founders should model cumulative dilution across anticipated rounds to understand their likely ownership at exit.
Valuations fluctuate with market cycles. What was a reasonable Series A valuation in 2021 may be very different from 2024. Founders should focus on building lasting value rather than optimizing for peak valuations during frothy markets.
For more guidance, see the Valuefy blog.
Pair this tool with the Equity Split Calculator and the Funding Calculator to cross-check inputs. For strategic context, read our business acquisition process guide and explore the Startup & Fundraising tools hub.
Post-money valuation directly determines investor ownership: a $2M investment at $10M post-money always equals 20% ownership, regardless of how the deal is framed.
Plan for multiple funding rounds. If you give away 20% at seed and 25% at Series A, your combined dilution is 40%, not 45%. Use our dilution calculator to model scenarios.
Watch out for the option pool shuffle. A 15% round with a 10% pre-money option pool effectively gives investors nearly 24% of the pre-investment company value.
Y Combinator recommends founders maintain at least 50% ownership after Series A. This preserves control and motivation while leaving room for future rounds and employee equity.
Focus on building value, not maximizing valuation. A higher valuation means higher expectations for the next round. Reasonable valuations with strong investors often lead to better long-term outcomes.