How Much Runway Does an Accelerator's Check Size Actually Buy You?

The Question You Should Be Asking Instead of "Is 6% Fair?"

Most founders evaluate an accelerator the way they'd evaluate a used car: they look at the price tag (the equity) and decide if it feels okay in their gut. Six percent sounds reasonable. Seven percent sounds standard. Five percent sounds like a deal.

None of that tells you anything useful.

The question that actually matters is: does this program's check size buy you enough time to hit your next milestone? Equity is the cost. Runway is what you're buying with it. Staring at the cost without checking what you get for it is how founders end up three months into a cohort, back to fundraising, having given up equity for a check that never covered enough burn to matter.

This isn't a judgment call or a vibe. It's arithmetic, and it takes about thirty seconds once you have the two numbers you need: check size and your monthly burn.

The Math: Check Size Divided by Burn Equals Months Bought

Here's the whole calculation:

Months of runway bought = Check size ÷ Monthly burn

That's it. If a program's check size is $125,000 and your team burns $20,000 a month, that check buys you roughly 6.25 months. If another program offers $100,000 to a team burning $25,000 a month, that's exactly 4 months.

Now put equity next to it. Say Program A takes 6% for that $125,000 check (6.25 months of runway), and Program B takes 5% for that $100,000 check (4 months of runway). Program B looks cheaper because the equity number is lower. But if your milestone (a working pilot, a fundraise-ready metric, whatever comes next for your startup) is five months out, Program B leaves you short and back in the fundraising conversation with less equity to offer and less proof of progress to show for it. Program A, despite costing you more equity on paper, actually gets you where you need to go.

This is the part founders skip. They compare 6% to 5% and stop there, as if equity percentage exists independent of the check attached to it. It doesn't. A check size and an equity ask are one deal term, not two.

Why This Trips Up First-Time Founders Especially

If you're new to this, the jargon doesn't help. Programs quote checks that sometimes come as a straight cash amount and sometimes as a SAFE (a Simple Agreement for Future Equity, which converts to actual shares later, usually at your next priced round). Some carry an MFN clause (Most Favored Nation, meaning if you give a later investor better terms, the accelerator's SAFE gets upgraded to match). None of that changes the runway math, but it does mean you need to read the actual terms, not skim a pitch deck line that says "we invest $125K for 6%" and assume that's the whole story.

For a deeper breakdown of how equity percentages get treated as a fixed standard when they're often negotiable, see The 7% Assumption. It's the same instinct at work: founders anchor on a number because it's the one everyone quotes, not because it's the one that matters most for their situation.

Why You Can't Rank Programs by Equity Alone

Equity percentage answers "how much of my company am I giving away." Check size divided by burn answers "how much time does that buy me." You need both to know if a deal is good, and ranking programs by equity alone will actively mislead you, because:

• Lower equity doesn't mean lower cost. A smaller check at lower equity can still cost you more per month of runway than a bigger check at higher equity. Do the division before you decide which one's the "cheap" option.
• Runway needs a destination, not just a duration. Four months of runway is worthless if your next fundraising conversation realistically needs six. The question isn't "how many months" in the abstract, it's "how many months relative to my actual milestone."
• The equity number is the easy part to compare. The check size is the part people forget to check twice. Founders will scrutinize an equity clause line by line and then take a headline check-size number at face value without confirming it's current.

That last point matters more than it sounds like it should, which brings us to the part of this that's actually about data quality, not math.

The Math Is Only as Good as the Number You Feed It

Here's the uncomfortable truth about runway calculations: if the check size you're using is stale, wrong, or scraped from an outdated press release, your careful division problem is just a confident-looking wrong answer. Garbage in, garbage out, except the garbage is your actual company's timeline.

This is the entire reason Accelerator Atlas exists as a verified directory instead of a roundup post. Of the 105 US accelerator programs listed across 14 verticals, 102 are checked against the program's own primary documents, not secondhand summaries. Every program shows its source and a check-date, plus a confidence label: Verified, Secondary, or Unverified. If we can't confirm a number, we show a blank instead of guessing, because a blank you can trust beats a figure you can't.

The side-by-side terms comparison exists specifically for the exercise you just walked through: pulling check size and equity for multiple programs at once, in plain English, without digging through a stack of primary documents yourself for every single one. Compare Program A's $125K/6% against Program B's $100K/5% against a third option in your vertical, and run the division on all three in the time it would've taken to parse one term sheet's fine print.

If you're weighing a well-known name against a smaller program, the same terms-first logic applies: a bigger brand attached to a smaller check doesn't automatically buy more runway just because more people have heard of it. Is a Famous Accelerator Worth More Equity? walks through that comparison directly.

What to Do Once You Know Which Programs Actually Buy Enough Time

Once you've filtered down to the programs whose check size clears your runway bar, you've got a shortlist based on math instead of gut feel. The next constraint is timing: even the best-fit program is useless if you miss its application window. That's a separate problem from the one this post solves, and it's worth tracking deadlines by vertical once your shortlist is set, so the programs with the right terms don't quietly close applications while you're still running the numbers on the others.

Compare check size and equity side by side for your vertical at Accelerator Atlas before you calculate runway on a guess.