Yes.
Post Money SAFE Calculator
Free
Free SAFE calculator in Excel to calculate the post-money and pre-money SAFE from Y-Combinator.
This is the first Excel model made to assist founders, lawyers and investors in understanding how SAFE notes impact ownership on the cap table of startups.
- Excel tool
- All calculations done
- Y-Combinator
- Post-Money SAFE
- Pre-Money SAFE
- Add ESOP
- Macros to set document settings
testimonials
Recommended
A couple of extracts from thank-you emails.
What
What is a Post-Money SAFE Calculator?
It’s a free and very detailed Excel calculator which will show you in detail how both Pre and Post- money SAFE notes are calculated.
Y-Combinator released the new post-money SAFE in October 2018. It’s a large change from the original pre-money SAFE that was released in 2013.
When YC released their PM SAFE there was no calculator to illustrate the mechanics so I figured it out.
This awesome calculator will show you the dilutive effects of raising with SAFEs.
Details
SAFE tool images
See what you can access.
video time
Watch a Video On the Tool
Hang out with me as I take you through the model template. Joy!
read more
Read the guide
I moved details to blog(s) to keep this page clean.
Read the guide for the SAFE note calculator here:

Access
Download the SAFE Calculator
Fill in your details and it will be emailed to you automatically.
You agree to all T&C legal stuff
FAQs
Check the FAQs if you are having issues. Don’t message me if “I can’t download the file”.
Fill in your name and email in the submission form and it will be emailed to you.
My (automated) system works. You’ve made a basic mistake.
- Check you input your email accurately
- Check your spam folder (Whitelist me if you found the email in spam)
Yes. You can book a consulting call here:
When you press download in an email from me, it normally saves to your Downloads folder.
So go there first to find the file.
I normally have to ZIP the file so it will work with SaaS automation systems.
So get WinZip, WinRAR, or use whatever Mac/PC offers these days. Unzip the file (Right click and press “uncompress” etc). If you don’t know how to do this, then use Google.
Once you uncompress, the ZIP file will remain, and you will see a new file (sort the download folder by date modified if confused).
I assure you that everything I provide works, so if you can’t access it, it’s a ‘you’ problem.
No.
You can share a link to this page, which would be much appreciated!
Please share the link to this page. It would be super-appreciated, but only if you like it!
If you don’t like it, then leave a comment or shoot me an email first so I can take your feedback on board first and see if I can improve!
features
What Can the Model Do?
These are some of the features in the model.
3 Note Types
Sheets for different cases
- 3 sheets
- Simple calculations
- Complex 2 post note
- Complex pre and post notes
Check Against YC
The model matches their documents
- Macro to set/reset inputs
- Check all input and outputs to docs
Math Explained
All formulas and logic spelt out
- Track all formulas
- See sensitivity tables
- Acquisition analysis
Need
Why Do You Need a Post Money SAFE Calculator?
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1
Post-Money SAFE Math is Not Simple
- The pre-money note was easier to calculate (but had the uncertainty of ownership to investors)
- The Y-Combinator docs are iffy
- You need a tool to understand the maths
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2
There Are Only Online Tools
- Last time I checked, there were online tools
- 1 and maybe 2 have broken math
- No one else has made an Excel calculator like this
- Y-Combinator won’t release a public Excel (I had some chats…)
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3
Know What You Are Signing
- SAFE documents look simple (and you are told they are), but they are not
- You need to understand the effect of dilution of a SAFE note
who
Who Needs a Post Money SAFE Calculator?
Everyone in startup-related land needs to know about this topic. So whether you are a founder, investor or advisor, why not have a little play with this!
Need
Why is My Tool Worth Getting
-
1
I Make Cool Things (and am capable)
- There is a lot of blah around by people who aren’t terribly good at Excel/PowerPoint etc
- You’ll see the attention to detail and actual thought put into what I gift you (so you aren’t wasting your time)
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2
My Free Tools Are Better Than What Some Charge For
- I only made tools because I couldn’t find anything I would use myself
- Even if you don’t ‘actually need the tool’, the point is to teach you concepts you can apply
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3
I Don’t Have a Hardcore Marketing Funnel
- I make tools to actually help founders
- You aren’t going to be hounded with emails to get you to buy things
- Whilst I do sell some stuff, seeing the quality I give for free is way better marketing than using fancy words to convince you
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Learn moreComments (4)
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Feel free, Kazemi!
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Please e-mail me a copy of your SAFE calculator and Post SAFE calculator
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Brad- the site is automated.
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This looks great, and I would love to use it.