Cargo Insured Value Calculator: CIF+10% Convention

Formula, assumptions, and limits

The insured value of cargo is the CIF value marked up by the agreed percentage, conventionally 10 percent. To calculate it, add the cost and the freight, apply the markup, and solve for the premium being part of the CIF value itself:

$$V = \frac{(C + F)(1 + m)}{1 - r(1 + m)} \qquad P = r \cdot V$$

C - cost of the goods, the commercial invoice value. F - international freight. m - markup over CIF, conventionally 0.10. r - premium rate as a fraction of the insured value, from the insurer’s quotation.

The denominator carries the point most hand calculations miss: CIF includes the insurance premium, and the premium is a function of the insured value, which is a function of the premium. The algebra closes the loop in one step. At a representative 0.35 percent rate the correction adds about 0.4 percent to the naive figure; small, but an underwriter’s slip computes it, and an assured who declares the naive figure is marginally underinsured on the convention’s own terms. With the rate at zero the formula collapses to the familiar CIF times 1.1.

The legal floor sits in the Marine Insurance Act 1906, section 16: the insurable value of goods is their prime cost plus shipping expenses and charges of insurance. The 10 percent markup above that is contract, not statute: it stands in for the buyer’s anticipated margin and the incidental costs of replacing goods at destination. Incoterms 2020 CIF obliges the seller to procure cover complying with at least the Institute Cargo Clauses (C) for a minimum of 110 percent of the contract price; parties agree higher cover and broader clauses freely, and the calculator’s markup field takes whatever the contract states.

Limits: the tool computes the agreed-value convention for full-value cargo cover under the Institute Cargo Clauses pattern. It does not model duty insurance (often written as a separate increased-value item), seller’s-interest or contingency covers, or open-cover declarations where the basis of valuation clause may differ; read the policy’s valuation clause when it departs from CIF plus 10.

How to use this calculator

1. Enter the cost of the goods from the commercial invoice.
2. Enter the international freight.
3. Keep the markup at 10 percent or set the contract’s figure.
4. Enter the premium rate from the insurer’s quotation.
5. Read the insured value, the premium, and the underlying CIF value; the chart shows how the value builds from cost to insured value.

Where each input comes from

• Cost of goods: the commercial invoice. Where the sale is on CIF terms the invoice may already state a CIF total; this calculator wants the components, so take the goods price line.
• Freight: the freight invoice or quotation; the ocean freight cost calculator assembles the all-in figure from a quoted rate and its surcharges.
• Markup: the sales contract or the policy’s basis-of-valuation clause. CIF sales under Incoterms oblige the seller to insure at a minimum of 110 percent unless the contract says otherwise; open covers state their own basis.
• Premium rate: the insurer’s or broker’s quotation for the cargo, packing, route, and clauses. Duty and increased-value covers carry their own rates and sit outside this calculation.

Worked example

Goods invoiced at USD 100,000, freight USD 4,000, markup 10 percent, premium rate 0.35 percent. Insured value: 104,000 × 1.1 / (1 − 0.0035 × 1.1) = 114,400 / 0.99615 = USD 114,842. Premium: 0.35% × 114,842 = USD 402. Check the circle: CIF = 100,000 + 4,000 + 402 = 104,402, and 104,402 × 1.1 = 114,842. The naive calculation (104,000 × 1.1 = USD 114,400) would have declared USD 442 short.

Common errors

1. Insuring the invoice value. An FOB invoice misses the freight, the premium, and the markup; a claim settles against the declared value, and the gap is the assured’s.
2. Applying the markup to cost only. The 10 percent rides on the full CIF, freight and premium included, not on the goods alone.
3. Forgetting who arranges insurance under the Incoterm. Under CIF the seller must insure at a minimum of 110 percent for the buyer’s benefit; under FOB or CFR the buyer arranges its own cover and this calculation is the buyer’s to run.
4. Treating 110 as law. It is convention and contract default; high-margin trades agree 120 or more, and the policy’s valuation clause governs. Enter the contract’s figure, not the folklore.

Underinsurance and the average clause

The USD 442 in the worked example is small until a claim makes it structural. Under the Marine Insurance Act 1906, section 81, an assured covered for less than the insurable value is “deemed to be his own insurer in respect of the uninsured balance”: partial losses pay out pro rata. Declare 90 percent of the proper value and a partial loss settles at 90 percent of the indemnity, with the missing tenth carried by the assured. The convention’s generosity, the 10 percent over CIF, exists partly to keep routine declaration errors on the right side of that clause; computing the value correctly in the first place is the cheaper protection.

About This Cargo Insured Value Calculator

The insured value is the single number the whole cargo policy hangs on: premium is charged on it, claims settle against it, and underinsurance is measured from it. This calculator is for shippers, traders, and forwarders arranging cover who need the CIF plus 10 figure computed the way an underwriter computes it: cost plus freight, marked up, with the premium solved inside the CIF base rather than bolted on after.

The arithmetic follows the marine market’s standing convention with the Marine Insurance Act 1906 section 16 floor underneath it, and the markup field accepts whatever percentage the sales contract or policy states. The premium-inclusion algebra is the detail that separates a desk estimate from a declaration that matches the insurer’s slip; the worked example shows the naive figure landing USD 442 short on a routine consignment.

The chart stacks the build: cost, freight, premium, markup, insured value, with hover and keyboard tooltips and a table fallback. For the freight figure, the ocean freight cost calculator assembles the all-in number this page consumes; for the full import economics beyond insurance, the landed cost calculator carries duty and tax on top.

Further reading

• Cargo insurance and the Institute Cargo Clauses
• General average and the York-Antwerp Rules
• Landed cost calculator
• Ocean freight cost calculator

Frequently asked questions

What does CIF plus 10 percent mean in cargo insurance?

The marine market's standard basis for the insured value: the cargo's cost, insurance, and freight value, marked up 10 percent to cover the buyer's expected margin and the incidental costs of replacing goods at destination. The markup is convention and contract, not law; sales contracts sometimes state a different percentage.

How is the insured value calculated?

Add the cost of the goods and the freight, apply the markup (conventionally 10 percent), and account for the premium being part of the CIF value itself: insured value = (cost + freight) x 1.1 / (1 - rate x 1.1). At typical premium rates the circularity adds a fraction of a percent; at zero rate the formula collapses to CIF x 1.1.

Why is cargo insured for 110% of the CIF value?

The 10 percent over CIF stands in for the buyer's anticipated margin on the goods and the incidental costs of replacing them at destination: re-ordering, re-shipping, and the time the capital sits in a lost consignment. It is the marine market's standing convention and the Incoterms 2020 CIF minimum, not a legal cap; contracts agree higher percentages for high-margin trades.

Is the insured value the same as the invoice value?

No. The invoice states the cost of the goods on the agreed Incoterm. The insured value adds freight where the buyer carries it, the premium itself, and the conventional markup, so a CIF-plus-10 insured value runs roughly 15 percent and upward above an FOB invoice for the same goods, depending on the freight share.