Revenue Forecast Calculator

Revenue forecasting is the foundation of every financial decision at an early-stage company. Whether you are planning headcount, setting fundraising timelines, or deciding when to invest in marketing, having a reliable MRR projection is non-negotiable. Without it, you are flying blind.

The most common mistake founders make is forecasting with a flat growth rate and ignoring churn entirely. In reality, a 10% monthly growth rate combined with 5% monthly churn produces very different results than 10% growth with 2% churn. Over 12 months, the difference compounds to hundreds of thousands in projected ARR. Our revenue forecast guide for early-stage startups walks through this in detail.

Cash flow is the other side of the coin. A revenue forecast tells you what is coming in, but you also need to understand what is going out. Use our cash flow forecast example to build a complete financial picture alongside your revenue model.

For investors, your revenue forecast is a signal of how well you understand your business. A founder who can clearly articulate their growth rate assumptions, churn dynamics, and resulting ARR trajectory inspires confidence. Pair this calculator with the runway calculator to show investors exactly how long your current capital will last at your projected growth rate, or use the burn rate calculator to model different spending scenarios against your forecasted revenue.

Net MRR growth — the difference between new revenue added and revenue lost to churn — is the single most important number in your forecast. If your net growth is positive, your business is compounding. If it is negative, no amount of new customer acquisition will save you. Focus on the ratio between growth and churn, and use this tool to stress-test your assumptions before committing to a plan.