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Business Cash Reserve Calculator

Calculate how much cash your business should reserve and measure your current runway against that target.

Quick answer: Size a business cash reserve using a target number of months of operating expenses, and see how much runway the current reserve actually provides. Enter Monthly Operating Expenses, Target Months of Reserve, and Current Cash Reserve to personalize the estimate. It returns Target Reserve Amount, Reserve Gap, and Months of Runway Currently so you can compare the impact before choosing a next step. Use it to compare payment, APR, total cost, credit impact, and lender or card tradeoffs.

SWReviewed by SwitchWize Research Desk · Last reviewed July 1, 2026
Target Reserve Amount
$100,000
Target Reserve Amount
$100,000
Reserve Gap
$60,000
Months of Runway Currently
2 months
Diagnostic

At 4 months of expenses, your target reserve is about $100,000.

Your current reserve provides about 1.60 months of runway, a gap of about $60,000 from your target.

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What to do next

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Your action plan
  1. 1

    Set the target and timeline for this plan

    Size a business cash reserve using a target number of months of operating expenses, and see how much runway the current reserve actually provides.

  2. 2

    Pressure-test one alternate scenario before deciding

    Assumptions change the answer, especially when rates, taxes, or timing matter.

  3. 3

    Save the result to Money Map or use the linked next action

    Turn the result into a prioritized action instead of treating it as a one-off number.

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This is an educational estimate, not tax, legal, investment, or lending advice. Tax rules, rates, and eligibility change and depend on your full situation. Confirm with a qualified professional or the provider before acting.

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Frequently Asked Questions

Everything you need to know.

What does an example Business Cash Reserve Calculator calculation look like?
Using this calculator's own default assumptions, a monthly operating expenses of $25,000, target months of reserve of 4 and current cash reserve of $40,000 produces an estimated target reserve amount of $100,000 and reserve gap of $60,000. Enter your own numbers above to see how it changes for your situation.
How do I decide what target number of months is right for my business?
Businesses with stable, predictable revenue can operate with a leaner reserve, while those with seasonal swings, lumpy contracts, or volatile income need a larger cushion. Consider how quickly you could raise capital or cut expenses in a crisis, and how much uncertainty exists in your revenue stream.
What if my current cash reserve is less than my target?
The reserve gap shows you how much additional cash you need to build to reach your target. This gap narrows as you accumulate profit; a smaller monthly surplus means it takes longer to close the gap, while stronger cash generation lets you reach your target faster.
Is the Business Cash Reserve Calculator free to use?
Yes. SwitchWize calculators are free, and you do not need an account to run scenarios or view the result.
Does using the Business Cash Reserve Calculator affect my credit score?
No. Using a calculator does not trigger a credit check. A credit impact can occur only if you apply directly with a lender, card issuer, or provider.
Are the results personalized financial advice?
No. Calculator outputs are educational estimates based on the inputs you enter. Review assumptions and confirm terms directly with providers before making a financial decision.
What should I do after seeing the result?
Use the recommendation module on this page to compare business savings options, or run Money Map to compare this loans & credit decision with your other opportunities.
How does SwitchWize choose related offers?
Related offers are matched by the calculator surface (savings) and ranked using SwitchWize data such as rate, fees, trust signals, product fit, and switching friction. Paid relationships do not change organic ranking order.
How fresh are the rates and offers shown?
Rate and offer data is reviewed on a recurring cadence and every offer module shows review context or links to the methodology and disclosure pages.
Where can I see the ranking methodology?
The SwitchWize methodology page explains how rate freshness, editorial review, affiliate disclosure, and category ranking factors work.
Can Money Map use this result?
Yes. Money Map is the broader diagnostic path: it compares savings, mortgage, cards, and debt so you can see whether this calculator result is your highest-impact next move.

Why This Matters

A cash reserve acts as a financial buffer that lets your business weather unexpected downturns, missed revenue, or emergency expenses without forced borrowing or operational disruption. By sizing your reserve to a specific number of months of operating expenses, you create a concrete target tied to your actual business burn rate. Knowing your current runway against this target helps you prioritize whether to build reserves, invest in growth, or adjust spending.

How to Use It

  1. 1Enter your monthly operating expenses (all the fixed and variable costs required to run your business each month).
  2. 2Set your target months of reserve, which represents how many months of operations you want to be able to fund from cash alone.
  3. 3Input your current cash reserve balance.
  4. 4Review your target reserve amount, the gap between your target and current reserve, and how many months of runway your current cash actually provides.
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