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Seed Stage Funding Calculator

This calculator estimates the amount of outside funding a seed-stage company may need to reach a target runway. It starts with current cash, monthly operating burn, expected monthly revenue, one-time costs, and a safety buffer.

The result is a planning estimate for fundraising discussions and scenario analysis. It helps founders see whether the requested round covers operating losses and known milestones without treating every dollar of spending as fixed.

Funding plan

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Result
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Estimated funding need
Monthly net burn—
Base cash requirement—
Safety buffer amount—
Projected ending cash after raise—

1. Record available cash
Enter unrestricted cash that can be used to fund operations.

2. Estimate monthly expenses
Use the average cash operating outflow expected during the runway period.

3. Enter monthly cash revenue
Use revenue expected to be collected in cash, not merely booked.

4. Choose runway and one-time costs
Set the planning horizon and add known milestone expenses such as equipment, launch, or legal work.

5. Add a safety buffer
Apply a contingency percentage, then review the incremental funding required.

Monthly net burn = max(Monthly expenses − Monthly cash revenue, 0)
Base cash requirement = Monthly net burn × Target months + One-time costs
Funding need = max(Base cash requirement × (1 + Buffer rate) − Current cash, 0)

What the result means

The result is the additional capital needed under the entered spending, revenue, timing, and buffer assumptions.

The estimate excludes financing fees, debt repayments, taxes, and month-by-month changes unless included in the inputs.

Given: $250,000 cash, $120,000 monthly expenses, $35,000 monthly cash revenue, 18 months, $100,000 one-time costs, and a 15% buffer.

Calculation: Net burn = $85,000. Base need = $85,000 × 18 + $100,000 = $1,630,000. Buffered need = $1,630,000 × 1.15 = $1,874,500. Funding need = $1,874,500 − $250,000 = $1,624,500.

Result: Estimated additional funding is $1,624,500.

Should expected fundraising fees be included?

Yes. Add legal, placement, diligence, and closing costs to one-time planned costs when they will be paid from the round.

What if revenue exceeds expenses?

Net burn is set to zero in this model. The funding need may still be positive because of one-time costs and the safety buffer.

How large should the buffer be?

The appropriate buffer depends on forecast uncertainty, hiring plans, milestone risk, and fundraising conditions. Use scenarios rather than assuming one universal percentage.

Should restricted cash be entered?

Only include cash available for ordinary operations. Restricted deposits or funds committed to another purpose should generally be excluded.

Is the result the same as a valuation target?

No. Funding need estimates capital required; valuation determines the price at which ownership is sold.