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SaaS Funding Calculator

The SaaS Funding Calculator estimates the amount of external capital needed to reach a target operating runway while preserving a minimum cash buffer. It compares current cash and expected operating cash generation with planned monthly expenses over the selected runway period, then adds optional one-time uses such as hiring, equipment, or transaction costs.

Founders and finance teams can use the result to frame a fundraising target and test how changes in burn or revenue affect capital needs. The estimate is intentionally operational: it does not set valuation, ownership, or financing terms. A practical raise may also include contingency for delays, uneven collections, taxes, debt service, and financing expenses not captured in the base inputs.

Funding requirement assumptions

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Result
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Estimated funding required
Monthly net burn—
Cash needed for target runway—
Total cash requirement—
Current runway before funding—

1. Enter current usable cash
Use cash available for operations, excluding restricted amounts.

2. Enter monthly expenses and inflows
Base the calculation on expected cash movement rather than accounting revenue alone.

3. Choose a target runway
Set the number of months the financing should support under the entered operating plan.

4. Set an ending cash buffer
Preserve a minimum balance instead of targeting exactly zero cash at the end of the runway.

5. Add one-time uses
Include planned hiring bursts, equipment, debt repayment, or transaction costs not in monthly expenses.

6. Review the capital gap
The estimated raise is the amount by which total cash needs exceed current available cash.

Monthly net burn = Monthly cash expenses − Monthly cash inflows
Runway operating cost = max(0, Monthly net burn × Target months)
Total cash requirement = Runway cost + Ending cash buffer + One-time uses
Funding required = max(0, Total cash requirement − Current cash)

When inflows exceed expenses, the recurring operating component is floored at zero; one-time uses and the desired ending buffer can still create a funding requirement.

What the result means

The main result is the estimated external capital needed to support the target period and cash buffer.

The funding target does not include valuation, dilution, financing availability, or unexpected changes unless those are added to the assumptions.

Given: $600,000 cash, $220,000 monthly expenses, $100,000 monthly inflows, 18 target months, $300,000 ending buffer, and $250,000 one-time uses.

Calculation: Net burn = $120,000. Runway cost = $120,000 × 18 = $2,160,000. Total need = $2,160,000 + $300,000 + $250,000 = $2,710,000. Funding required = $2,710,000 − $600,000 = $2,110,000.

Result: Estimated funding required is $2.11 million.

Should the raise target equal the calculator result exactly?

Not necessarily. Teams often add contingency for delays, hiring variance, taxes, financing fees, or weaker collections. The calculator provides a transparent base case.

What if monthly inflows exceed expenses?

The recurring operating requirement becomes zero in this model. A raise may still be needed for one-time uses or the desired ending cash buffer.

Should committed customer contracts count as inflows?

Only count cash expected to be collected during the modeled months. Contract value and cash timing are not always the same.

Can debt repayment be included?

Yes. Add scheduled principal payments as one-time uses or include recurring payments in monthly cash expenses, but do not count them twice.

How is this different from runway?

Runway estimates how long current cash lasts. Funding requirement works backward from a target runway and calculates the capital gap.