Estimate how many months seed funding can support your startup after planned hiring and marketing spend. This runway calculator helps founders test seed allocation, next raise timing, and cash risk before scaling.
Enter current cash, new seed funding, current burn, and expected monthly increases from hiring, marketing, or infrastructure.
The output estimates post-seed runway and whether the funding plan supports a realistic milestone window.
Seed runway shows how long your company can operate after the round closes. If runway is too short, the spending plan may need to be delayed or the raise amount increased.
Investors often expect seed capital to fund meaningful traction before the next round, not only cover overhead.
With $60,000 current cash, $750,000 seed funding, $45,000 current burn, and $18,000 new monthly spend, total capital is $810,000 and runway is 12.9 months.
Add current cash and seed funding, then divide by adjusted monthly burn to estimate how many months the capital will last.
Multiply your expected post-seed monthly burn by 18, then subtract current cash to estimate the minimum funding need.
Hiring increases monthly burn, which reduces runway unless it is offset by revenue growth or a larger funding round.
Many founders begin preparing the next raise when 9 to 12 months of runway remain, especially if growth milestones are still developing.
Marketing allocation depends on CAC and payback. The calculator helps test whether planned marketing spend leaves enough runway.
| Metric | Use |
|---|---|
| Total capital | Cash available after seed funding. |
| Adjusted burn | Monthly spending after planned increases. |
| Runway months | How long capital supports operations. |
| Raise timing | Whether next round preparation should start soon. |