Conversion and renewal are two different rights, and NAIC's own glossary runs them together. The second sentence of that glossary entry reads: "The insurer is required to renew the policy regardless of the health of the insured subject to policy conditions." That describes renewability, not conversion, and NAIC defines renewability separately under "Renewable Term Insurance": "insurance that is renewable for a limited number of successive terms by the policyholder and is not contingent upon medical examination." Washington's guide keeps the two apart and shows why the distinction has teeth. On renewal, "you may buy it for another term at a rate guaranteed in the policy," which means the price was fixed when the policy was issued. On conversion, the coverage becomes cash value insurance "at the insurer's current premium rates," which means the price is set at the time you convert. Same absence of health evidence, different product, different way of arriving at the price. The state's shopping advice is to look for policies that are "both renewable and convertible," which only makes sense because they are separate features.
What the option is actually worth. The conversion right has value in exactly one circumstance: the insured's health has deteriorated enough that new coverage would be rated, declined, or unaffordable, and the need for coverage has turned out to be permanent rather than temporary. In that case the option is the only route to lifelong coverage at a price that ignores the diagnosis, and it can be worth many multiples of what the term policy cost. In every other circumstance it is worth little, because a healthy insured can simply apply for a new policy and be underwritten on their current health, which is usually cheaper than converting. So this is insurance against a specific bad outcome, and it is normally included in a policy's price rather than bought separately.
The premium after conversion is not the term premium continued. Conversion does not carry the old price across. The new policy is priced at the insurer's rates for a permanent contract at the insured's attained age, and a permanent premium is a multiple of a term premium for the same death benefit before age is even considered. Washington puts the shape of it plainly: "premium rates start fairly low and then rise after you convert." What conversion preserves is the underwriting class established at the original application, so the diagnosis that would have made new coverage expensive or unavailable does not enter the calculation. That is the whole benefit, and it is a large one, but it is not a cheap way to get permanent insurance.
Three contract terms decide whether the right is usable. The first is the window: conversion is normally allowed for a number of years from issue, or up to a stated attained age, whichever comes first, and once it closes it does not reopen. The second is the product list: the contract sets which permanent policies are available on conversion, and it can be a subset of what the insurer sells, sometimes a single designated conversion product. The third is whether partial conversion is permitted, since converting a portion of the face amount and letting the rest run out is often the affordable version of the decision. All three are answerable from the policy, and all three are much easier to establish when buying the term policy than in the year the level period ends.