Business Funding Calculator
Most founders can quote their startup costs to the dollar but have no idea how much funding they still need to raise. This calculator separates the two questions: it totals what the launch will cost, including months of operating runway, then subtracts the owner cash, loans and investor money you already have. The result is your funding gap, graded from Fully funded to Shortfall.
The badge reads the exact gap: zero or a surplus reads Fully funded, a gap within 20% of the total needed reads Close, anything larger reads Shortfall.
Please enter valid non-negative numbers.
Quick Answer
With $80,000 in startup costs and $9,000 a month for 6 months of runway, the launch needs $134,000. Against $50,000 of owner cash, a $60,000 loan and $24,000 from investors, the funding gap is $0: Fully funded. Enter your own six numbers above for the same gap-or-surplus verdict.
Key takeaways
- Funding gap = (startup costs + monthly costs × runway months) − (owner cash + loans + investors). A positive number is what you still must raise.
- Runway working capital often dominates the total: in the example $54,000 of the $134,000, about 40%, is operating cushion, not startup.
- This page answers the funding question. The startup cost calculator answers the cost question: they are a complementary pair, use both.
- A zero gap means no cushion: aim to secure 10–15% more than the calculator says you need.
- Quick Answer
- How to use the business funding calculator
- The funding-gap formula: what you need minus what you have
- Worked example: the specialty store with zero gap
- Reading the verdict: Fully funded, Close, or Shortfall
- Where the money comes from: the real trade-offs
- What lenders actually look at
- What this calculator covers, and why each part matters
- Frequently asked questions
- Add This Calculator to Your Website
- References
How to use the business funding calculator
Type six numbers and click Calculate. The results stay hidden until you calculate.
- Enter what you need: one-time startup costs, monthly operating costs, and how many months of runway to fund. The specialty-store example has $80,000, $9,000 and 6 pre-filled.
- Enter what you have: your owner contribution, loans secured or expected, and investor or other funding. The example has $50,000, $60,000 and $24,000 pre-filled.
- Click Calculate funding gap: the headline shows the gap (or surplus), the detail line shows the needed and secured totals, and the badge grades the result.
- Copy or share the result with the buttons in the results box when you take the numbers to a lender or partner.
Invalid inputs are rejected outright: a blank or non-numeric entry, or any negative number, shows "Please enter valid non-negative numbers." Every field must be a real number, zero included.
The funding-gap formula: what you need minus what you have
The funding gap is the launch cost minus the capital already lined up. Both sides matter: founders who budget only the launch arrive at month four with an empty account and a lease they cannot break.
Secured = owner cash + loans + investors
Funding gap = Needed − Secured (a negative gap is a surplus)
Keep the cost-versus-funding distinction exact. The startup cost calculator builds up the one-time side item by item; this page takes that figure (plus the working-capital runway) and tests it against your funding sources. One page answers "what does it cost," this one answers "how much do I still need to raise." If the business is already trading and you are planning expansion, the EFN calculator covers that different question with the textbook percentage-of-sales method.
Worked example: the specialty store with zero gap
A founder is opening a small specialty store. One-time costs: $80,000 (leasehold improvements, fixtures, initial inventory, licenses). Monthly operating costs: $9,000. She wants 6 months of runway. Funding lined up: $50,000 of her savings, a $60,000 bank loan, and $24,000 from a silent partner. These are the pre-filled values, so Calculate reproduces them exactly.
2. Needed = $134,000
3. Secured = $50,000 + $60,000 + $24,000 = $134,000
4. Gap = $134,000 − $134,000 = $0 → Fully funded
Note the trap in the middle of that math: $54,000 of the $134,000, about 40%, is working capital, not startup. Fund only the launch and the business is out of cash before revenue covers the bills.
Reading the verdict: Fully funded, Close, or Shortfall
After the subtraction, the calculator grades the gap on a fixed three-band scale. The band reads the exact gap value, and a surplus always reads as Fully funded.
| Badge | When it shows | What it means |
|---|---|---|
| Fully funded | Gap is zero or negative | The plan is covered; a negative gap prints as a dollar surplus. But zero is not comfortable: any surprise creates an immediate crisis. |
| Close: small gap to close | Gap is positive and within 20% of the total needed | One more small source closes it: a modest owner top-up, a microloan, or trimmed costs. |
| Shortfall: more capital needed | Gap is larger than 20% of the total needed | The plan needs a structural fix: a bigger round, a cheaper launch, or a longer runway strategy, not pocket change. |
Where the money comes from: the real trade-offs
Every funding source has a price beyond its interest rate or equity stake. The calculator treats them identically; your business should not.
Owner savings
Good: no interest, no dilution, no applications. Lenders read it as skin in the game, usually 10–20% of the total.
Costs: limited by what you have, and it concentrates your personal risk in one basket.
SBA and bank loans
Good: you keep full ownership, and interest is tax-deductible. The SBA's 7(a) loan program is the standard federal route, with microloans for smaller asks.
Costs: requires collateral, history, and patience. Payments start immediately, funded or not.
Investors and partners
Good: big checks with no monthly payments, plus contacts and counsel.
Costs: you give up equity and some control. Expectations and timelines must align before the money lands.
If you are weighing a specific loan offer, the business improvement loan calculator models the payments, and the effective interest rate calculator shows the true cost once fees are included.
What lenders actually look at
Lenders do not fund your calculator output; they fund your credibility. They check your personal credit, your collateral, your industry experience, and whether your projections are grounded. The SBA's business plan guide is the standard template for presenting all of this.
Two numbers matter most in the conversation. The first is your owner contribution: lenders typically want 10–20% of the total from your own pocket, which the example's $50,000 (37%) clears easily. The second is debt service coverage: can the projected cash flow cover the loan payments with room to spare? Bring the breakdown, not just the total: lenders trust founders who can defend each line item far more than founders with a single round number.
Before you structure the funding, read the IRS Tax Guide for Small Business: loans and equity are taxed very differently, and interest on business debt is generally deductible as a business expense, per IRS Publication 535 on business expenses.
What this calculator covers, and why each part matters
This calculator answers the funding question: what you need, what you have secured, and what gap is left — with a verdict that grades the answer.
- The needed-versus-secured subtraction, with a graded verdict. Funding gap = (startup costs + monthly costs × runway months) − (owner cash + loans + investors). A positive number is what you still must raise. The verdict reads Fully funded, Close, or Shortfall.
- The worked example, with zero gap. With $80,000 in startup costs and $9,000 a month for 6 months of runway, the launch needs $134,000. Against $50,000 of owner cash, a $60,000 loan, and $24,000 from investors, the funding gap is $0: Fully funded.
- The trap in the middle of the math. $54,000 of the $134,000, about 40%, is working capital, not startup. Fund only the launch and the business is out of cash before revenue covers the bills — and a zero gap means no cushion: aim to secure 10–15% more than the calculator says you need.
- The three funding sources side by side. Owner cash, loans, and investors are entered separately, because each comes with different trade-offs — and the lender-expectation framing says what lenders actually look at before they fund a launch.
- A complementary pair, not a duplicate. This page answers the funding question. The startup cost calculator answers the cost question: use both.
Frequently asked questions
Startup costs plus several months of operating expenses. In the worked example: $80,000 of startup costs plus 6 × $9,000 of monthly costs = $134,000. Service businesses often need far less; retail and food businesses usually need more, which is why the runway months matter as much as the startup figure.
Total what you need (startup costs plus monthly costs times runway months) and total what you have secured (owner cash, loans, investors). Subtract secured from needed. A positive number is your gap: the amount you still must raise. This calculator computes all three figures and grades the gap.
Six months is the typical planning figure; twelve is safer for businesses with long sales cycles or seasonal revenue. Less than three months leaves no room for the delays that hit nearly every launch, from permits to fit-out overruns.
Loans keep your ownership intact but require repayment from day one and usually collateral. Investors bring bigger checks with no monthly payments but take equity and a say in decisions. Many founders use both: owner cash plus a loan for the predictable costs, investors for the growth bets.
Fully funded means your secured funding covers the total needed, or exceeds it (a surplus). Close means the remaining gap is within 20% of the total needed: one more small source closes it. Shortfall means the gap is larger than 20%: the plan needs a structural fix, not pocket change.
No, and that is the point. A startup cost calculator builds up the one-time cost side item by item. This calculator answers the next question: given what the launch costs, how much funding do you still need to raise? Use them as a pair, cost first, then funding gap.
It is the minimum, not a comfort zone. A zero gap means any surprise, a delayed permit, a broken fixture, creates an immediate crisis. Aim to secure 10–15% more than the calculator says you need, and treat the surplus as your contingency.
Yes. It runs entirely in your browser, needs no account, and stores nothing. Copy the result with “Copy my results” or send it to another app with “Share results”.
Add This Calculator to Your Website
Embed this calculator on your own site with the code below. Pick a size to preview it live, then copy the code.
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References
- U.S. Small Business Administration. 7(a) Loans (the flagship federal loan program for small businesses: loan amounts, terms, eligibility, and the owner equity injection lenders typically expect). Accessed October 24, 2026.
- U.S. Small Business Administration. Microloan Program (loans up to $50,000 for startups and small businesses, often paired with counseling). Accessed October 24, 2026.
- U.S. Small Business Administration. Write Your Business Plan (the standard template for presenting financial projections, funding requests, and company descriptions to lenders and investors). Accessed October 24, 2026.
- Internal Revenue Service. Publication 334, Tax Guide for Small Business (how business income, expenses, and startup costs are treated for tax purposes). Accessed October 24, 2026.
- Internal Revenue Service. Publication 535, Business Expenses (deductibility of business interest and other ordinary and necessary expenses). Accessed October 24, 2026.
- U.S. Small Business Administration. Investment Capital (SBA resources on equity financing: venture capital, angel investors, and what investors expect). Accessed October 24, 2026.