Public Liability Insurance Calculator

Public liability insurance premiums scale mainly with turnover and coverage limit. Low-risk trades (office-based consulting) price around 0.3-0.5% of turnover for 2m cover. Medium-risk (trades, beauty) closer to 1%. High-risk (construction, events) 1.5-3%. The exact premium depends on claims history and insurer appetite, but the model here gives a reasonable starting point.

Quick example

With annual turnover of 100,000 and coverage limit of 2,000,000 (plus risk factor of 1), the result is 500.00. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.

Which inputs matter most

You enter Annual Turnover, Coverage Limit, and Risk Factor (0.5 low, 1 medium, 2 high). Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.

What's happening under the hood

Base rate 0.5% of turnover for 2m cover at medium risk, scaled linearly by coverage limit and risk factor. Working estimator only — real quotes vary by insurer and claims history. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.

Using this as a check-in

Re-run this every three months. A single reading tells you where you stand; four readings tell you whether things are improving. The trend matters more than any individual snapshot.

What this doesn't capture

The score is a composite of the inputs you provide. Life context — job security, family obligations, health, housing — doesn't appear in the math but shapes the real picture. Use the number as a prompt, not a verdict.

Worked example: small plumbing business

A plumbing contractor with annual turnover of 250,000 wants 5,000,000 coverage and falls into the medium-risk category (risk factor 1.0). The calculator estimates:

1. Base premium: 250,000 × 0.5% = 1,250
2. Coverage adjustment: 5,000,000 ÷ 2,000,000 = 2.5
3. Risk adjustment: risk factor 1.0
4. Estimated annual premium: 1,250 × 2.5 × 1.0 = 3,125

This models one pricing pathway. Other insurers may price differently based on claims record, experience, or underwriting appetite.

Common scenarios

The calculator addresses three recurring questions:

• Coverage scaling: What happens to premium if I double my coverage limit? The premium scales proportionally.
• Risk category changes: How much more do high-risk trades pay? A high-risk business (factor 2.0) pays roughly twice the medium-risk premium for the same turnover and coverage.
• Growth impact: If turnover rises 20%, how does the premium move? Premium rises 20% as well (holding coverage and risk factor constant).

What the result shows and what it doesn't

The calculator models a simplified relationship between three variables and outputs an annual premium estimate. It does not account for claims history, prior losses, individual underwriting judgment, broker discounts, or market conditions. Real quotes from insurers will diverge based on these factors. The output is an educational illustration of how the three inputs interact, not a binding quote or prediction of actual cost.