What Is an Accelerator?

An accelerator is a fixed-length program, often a few months, that gives startups mentoring, connections and sometimes funding, usually in exchange for equity.

Category: Funding and investors · Reviewed 11 November 2026 · 2 min read

How it works

Accelerators run in cohorts: a group of startups starts together, works through a structured program, and finishes with a demo day where they present to investors. The program is commonly three to four months. Many offer a small investment in return for a percentage of the company, though terms differ, and some programs charge no equity or are run by corporations or universities.

Applications are competitive. The program usually targets companies with an early product or a strong team, and it concentrates on speed: customer feedback, product milestones and fundraising preparation.

Accelerator vs incubator

The two are often confused. An incubator typically supports very early ideas over a longer, more open-ended period, sometimes with shared space. An accelerator typically works with companies that already have something built, on a fixed schedule with a clear end. Names are used loosely, so read the terms of any program.

Example

Suppose a program invests $125,000 for 7 percent of each company in the cohort. A founder accepts, spends 12 weeks working with mentors, and presents at demo day. The valuation implied by that deal is about $1.8 million ($125,000 divided by 0.07), which may be lower or higher than she could get on her own. She should weigh it against the program's access and reputation.

Common mistakes

• Joining for the name without checking what past companies actually gained.
• Not reading the equity and follow-on terms.
• Expecting the program to supply customers or funding automatically.
• Applying too early, before there is anything to test.

Frequently asked questions

What is a startup accelerator?

It is a time-limited program that helps early companies grow quickly through mentoring, education, investor introductions and often a small investment in exchange for equity, ending with a demo day.

Are accelerators worth it?

It depends on the program and your situation. Strong programs can provide advice, a network and credibility, but they usually cost equity. Compare the terms and track record against your other options before applying.

Related terms

• Incubator
• Pre-Seed Funding
• Angel Investor
• Pitch Deck
• Startup Ecosystem
• Equity

Go deeper

• Accelerator vs Incubator: Differences and How to Choose GuideAccelerator vs incubator explained: what each does, how accelerators take equity, who each suits, and how to decide whether you need one at all.
• Startup Funding Stages: Pre-Seed to Series C Explained GuideStartup funding stages explained in plain English: pre-seed, seed and Series A, B and C, what each round is for, what investors expect and how rounds are sized.

All 70 startup terms · More terms starting with A · Guides

General information, not legal, tax or financial advice. Reviewed 11 November 2026.