Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Recommended E&O limit
$1,000,000
Exposure-based need (contract × multiplier)
$750,000
Gap vs current limit carried
$0
Contractual minimum requirement
$1,000,000
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How to use this
- 1Enter largest single client contract value ($).
- 2Enter liability multiplier (damages vs fees).
- 3Enter contractually required minimum limit ($).
- 4Enter current e&o limit carried ($).
- 5Read your recommended e&o limit on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Professional liability, or errors and omissions (E&O) insurance, protects consultants, agencies, and professional service firms against claims that your advice, work product, or service caused a client financial loss. Sizing the limit correctly means looking at your largest single client contract value (since that's your biggest single-claim exposure), any client-mandated minimum limits in your contracts, and your realistic worst-case liability if a major deliverable failure caused cascading damages beyond the contract price itself. This calculator takes your largest contract value, applies a liability multiplier reflecting how much a claim can exceed the contract's face value (courts often award damages well beyond fees paid, especially for consequential losses), and compares it against any contractual minimum limits your clients require, recommending the higher of the two.
Worked example
Using the values the calculator loads with:
Inputs
- Largest single client contract value: 150000 $
- Liability multiplier (damages vs fees): 5
- Contractually required minimum limit: 1000000 $
- Current E&O limit carried: 1000000 $
Results
- Recommended E&O limit: $1,000,000
- Exposure-based need (contract × multiplier): $750,000
- Gap vs current limit carried: $0
- Contractual minimum requirement: $1,000,000
What each field means
Inputs
- Largest single client contract value ($)
- The largest single client contract value used in the calculation, measured in $. Starts at 150000 $ so you have a working example on load.
- Liability multiplier (damages vs fees)
- The liability multiplier (damages vs fees) used in the calculation. Starts at 5 so you have a working example on load. Accepted range: 1–15.
- Contractually required minimum limit ($)
- The contractually required minimum limit used in the calculation, measured in $. Starts at 1000000 $ so you have a working example on load.
- Current E&O limit carried ($)
- The current e&o limit carried used in the calculation, measured in $. Starts at 1000000 $ so you have a working example on load.
Results
- Recommended E&O limit
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Exposure-based need (contract × multiplier)
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Gap vs current limit carried
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Contractual minimum requirement
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
Why would a claim exceed the contract's fee amount?
Courts typically award consequential and expectation damages, not just a refund of fees paid — if a consultant's bad financial model caused a client to lose a $2M acquisition deal, the claim reflects that lost value, not your $50,000 fee. This is why the liability multiplier in this calculator can reasonably run 5-10x the contract value for high-stakes professional work.
What's the difference between E&O and general liability for a service business?
General liability covers third-party bodily injury and property damage — someone tripping in your office. E&O covers financial loss caused by your professional advice, service, or work product being wrong, late, or negligent — the actual core risk of a consulting, accounting, legal, or design business. Most professional service firms need both, and neither substitutes for the other.
Do larger clients usually require specific E&O limits in contracts?
Yes, enterprise and institutional clients commonly mandate $1M-$5M E&O limits as a contract condition, sometimes requiring you to name them as additional insured or provide a certificate of insurance before work begins. Losing a large client relationship over an inadequate limit is common and easily avoidable by checking contract insurance clauses before signing.
Does E&O insurance cover intentional wrongdoing or fraud?
No. E&O covers negligent errors, omissions, and honest mistakes in professional services, not intentional misconduct, fraud, or criminal acts, which are explicitly excluded across essentially all policies. It also typically won't cover claims you knew about before the policy started, which is why continuous, uninterrupted coverage matters for claims-made E&O policies.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Professional Liability (E&O) Limit Sizing Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/professional-liability-limit-sizing
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/professional-liability-limit-sizing" target="_blank" rel="noopener">Professional Liability (E&O) Limit Sizing Calculator — RevenueLab</a> (2026).</p>
Source: [Professional Liability (E&O) Limit Sizing Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/professional-liability-limit-sizing) (2026).