#933 · Startup Tool

Seed Stage Funding Calculator

Estimate how much seed funding your startup should raise based on burn, runway, hiring needs, and a safety buffer. Use it to plan a realistic raise instead of guessing a round size.

Calculator

Startup inputs
USD
months
USD
%
Ad space

How to use this calculator

Enter monthly net burn, the runway you want after the raise, any one-time hiring or launch budget, and a safety buffer percentage.

The result shows the recommended funding target and the reserve built into the plan.

What the result means

The result estimates the capital required to reach the next milestone with a buffer. Too little funding increases bridge-round risk; too much may create unnecessary dilution.

Base Funding Need = Monthly Net Burn × Target Runway + One-time Hiring Budget; Recommended Raise = Base Funding Need × (1 + Safety Buffer).

Many seed startups plan for 18 to 24 months of runway. Below 12 months after a round is usually risky unless the next milestone is near.

Example calculation

With $80,000 monthly burn, 18 months of runway, $250,000 hiring budget, and a 15% buffer, the recommended raise is $1,943,500.

Tips for better results

  • Base the raise on milestone timing, not only monthly burn.
  • Add a buffer for slower sales cycles or hiring delays.
  • Model both conservative and aggressive burn cases.
  • Check dilution before finalizing the target round size.

FAQ

How much seed funding should my startup raise for 18 months of runway?

Multiply monthly net burn by 18 months, add planned one-time costs, then add a safety buffer for execution delays.

How do I calculate a seed round size from monthly burn rate?

Use monthly net burn multiplied by target runway, then add hiring, product, launch, and contingency budgets.

Is 12 months of runway enough after raising a seed round?

Twelve months can be tight for a seed-stage startup because fundraising, hiring, and product milestones often take longer than expected.

How much safety buffer should I add to a seed funding plan?

A 10% to 25% buffer is common for planning because early-stage forecasts are uncertain and delays can consume cash quickly.

Can raising too much seed funding hurt founder ownership?

Yes. A larger round can increase dilution if valuation does not rise proportionally, so funding needs should be balanced against ownership impact.

Startup metric table

MetricMeaning
Primary metricRecommended Raise
Decision useUse this result to judge startup health, investor readiness, and next operating priorities.
BenchmarkMany seed startups plan for 18 to 24 months of runway. Below 12 months after a round is usually risky unless the next milestone is near.
RecommendationImprove the weakest driver before scaling spend or fundraising assumptions.

Browse more calculators

Category hubs