Professional services
Workers Compensation Insurance Calculator
Works workers compensation premium, where classification and experience rating drive it.
Result
An estimating tool, not insurance advice and not a quote. Actual premiums are set by underwriting on factors no calculator sees: claims history, credit and loss data, exact location, construction, contract requirements and the insurer's own appetite. What cover you need is a question for a licensed broker who has looked at your situation. Rates are set by class code, and codes vary enormously: clerical work is a fraction of a percent of payroll while roofing and tree work are among the highest rates there are. The experience modifier compares your claims against others in the same class and applies for several years, so a single bad year raises premiums for a long time. Misclassifying employees to obtain a lower rate is fraud.
Get a Free Business AuditHow the calculation works
Payroll per classification times the rate for that class, adjusted by the experience modification factor and any schedule credits, giving the premium. The structure means premium follows payroll and claims history rather than negotiation, and the two levers available are correct classification and improving the experience rating.
What moves the number
- Payroll by classification code.
- The rate for each class, which differs enormously.
- Experience modification factor from claims history.
- State, since rates and rules are set at state level.
Where this one goes wrong
Classification is where errors persist quietly, and payroll assigned to a higher-rated class than the work performed costs money every year until someone audits it. Equally, assigning payroll to a lower class than the work warrants produces an audit adjustment with arrears rather than a saving. The experience modification factor is the longer game, since claims affect it for years, which means the cost of an injury extends well beyond its direct expense and makes prevention a financial argument as well as a moral one.
Before you quote
- Audit classification codes against work actually performed.
- Report payroll accurately, since audits adjust with arrears.
- Treat injury prevention as premium management.
Where the rules come from
Questions
About this calculator
How is workers compensation premium calculated?
Payroll by classification times each class rate, adjusted by an experience modification factor from claims history. That means it follows payroll and claims rather than negotiation, and the real levers are correct classification and fewer claims.
Can classification be wrong?
Frequently, and in both directions. Payroll in a higher-rated class than the work performed costs money every year until audited, while understating it produces an audit adjustment with arrears. Reviewing the codes against actual work is worthwhile.
How long does a claim affect premium?
Several years, because the experience modification factor looks back over a period. That extends the cost of an injury well beyond its direct expense and is why prevention is a financial argument as much as a safety one.
The formula
premium = payroll / 100 x class rate x experience modifier
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How to use this calculator
- Annual payroll ($). Enter your own figure; the page starts at $480,000.
- Rate per $100 of payroll. Enter your own figure; the page starts at 4.2.
- Risk classification. Enter your own figure; the page starts at Typical (1.0x).
- Deductible ($). Enter your own figure; the page starts at $0.
- Claims history loading (%). Prior claims increase the premium, sometimes sharply.
- Minimum premium ($). Enter your own figure; the page starts at $750.
The result updates as you type, so you can try a figure, see what it does to estimated annual premium, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Annual payroll | $480,000 |
| Rate per $100 of payroll | 4.2 |
| Risk classification | Typical (1.0x) |
| Deductible | $0 |
| Claims history loading | 0% |
| Minimum premium | $750 |
| Experience modifier | 1 |
What comes out
| Result | Value |
|---|---|
| Estimated annual premium main result | $20,160 |
| Per month | $1,680.00 |
| Before loadings | $20,160 |
| Credit for the deductible | $0 |
| Effective rate on exposure | 4.20% |
About $20,160 a year on $480,000 of payroll, an effective 4.20%. The experience modifier of 1 is the part you control, and it follows you for years.
How sensitive the answer is
Holding everything else steady and changing only annual payroll, this is what happens to estimated annual premium. It is worth knowing which of your inputs the answer actually hinges on, and which barely move it.
| Annual payroll ($) | Estimated annual premium |
|---|---|
| $240,000 | $10,080 |
| $360,000 | $15,120 |
| $480,000 example above | $20,160 |
| $720,000 | $30,240 |
| $960,000 | $40,320 |
Every other input is held at the example value while this one changes, which is not how a real job behaves. Treat it as a guide to which number matters most, not as five separate quotes.
What each figure means
- Annual payroll ($)
- A money amount, starting at $480,000.
- Rate per $100 of payroll
- A number, between 0 and 500, starting at 4.2.
- Risk classification
- Choose from Low risk (0.75x), Typical (1.0x), Higher risk (1.6x), High hazard (2.5x).
- Deductible ($)
- A money amount, starting at $0.
- Claims history loading (%)
- Prior claims increase the premium, sometimes sharply.
- Minimum premium ($)
- A money amount, starting at $750.
- Experience modifier
- A number, between 0.5 and 3, starting at 1.
What the results tell you
| Result | What it is |
|---|---|
| Estimated annual premium | The headline result. A money figure. |
| Per month | A money figure. |
| Before loadings | A money figure. |
| Credit for the deductible | A money figure. |
| Effective rate on exposure | A percentage. |
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