Prescription Drug Cost Calculator
One prescription, four ways to buy it
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Fill in the fields on the left and this updates as you type.
Know what this estimate is based on
- Jurisdiction
- General mathematical model
- Scope and limitations
- Educational estimate only. Confirm the assumptions, current rules, fees, and rounding that apply to your situation before making a decision.
- Source links checked
- Jul 30, 2026
Built and regression-tested by Smart Tools Lab. It has not been individually reviewed by a licensed financial, tax, or legal professional.
How to use
- 01
Find the plan's negotiated price for a 30-day fill on your explanation of benefits or the pharmacy receipt, and your copay or coinsurance for that tier from the formulary.
- 02
Get the cash or discount-card price for the same drug and quantity. Ask the pharmacy what it charges without insurance, and check a discount card, because the two are often very different.
- 03
Add the 90-day mail order price and copay from the plan, and how many 30-day fills you need in a year — twelve for a drug taken continuously.
- 04
Enter any manufacturer copay assistance available for the year, then answer the accumulator question: does that assistance count toward your deductible? The plan documents are the only place this is written, and it changes the answer substantially.
- 05
Compare the four routes over a year, then read the point at which paying cash would beat using your insurance, remembering that cash spending usually does not count toward your deductible.
Formula
Each route is priced fill by fill across the year. For a fill through the plan: the amount applied to the deductible is the lesser of the negotiated price and the deductible you have left; your cost share on whatever is above that is the tier copay, or your coinsurance percentage when no copay applies; the gross amount you owe is the sum. Manufacturer assistance is then applied against that gross amount until the yearly allowance runs out, and what remains is what you pay. The deductible moves by the full gross amount when assistance counts toward it, and only by what you actually paid when an accumulator applies. Mail order runs the same loop with the 90-day price and copay over the number of 90-day fills. The cash route is simply the cash price times the fills, and it moves no deductible at all. Cash beats insurance when the cash price is below your per-fill cost through the plan once the deductible is met.
Example
A drug has a $650 negotiated price for a 30-day fill, a $45 tier copay, $300 of deductible still to meet, a $320 cash price, and a 90-day mail order price of $1,800 with a $90 copay, taken twelve times a year. The manufacturer offers $3,000 of copay assistance and the plan runs an accumulator, so that assistance does not count toward the deductible. Through the plan at retail the year costs $840 before assistance and $435 after it, so the assistance is worth $405. Four 90-day mail order fills cost $660 before assistance and $0 after it, which makes mail order the cheapest route here. Paying cash would cost $3,840 for the year. Once the deductible is met a single fill costs $45 through the plan, so cash would only win below that price, and across the year just $2,895 of spending is credited to the deductible.
Definitions
- Copay accumulator
- A plan design under which manufacturer copay assistance pays the pharmacy but does not count toward the patient's deductible or out-of-pocket maximum.
- Copay maximizer
- A related design that spreads a coupon's maximum value evenly across the year and reclassifies the drug so the payments fall outside the ACA's cost-sharing limits.
- Formulary tier
- The band a plan places a drug in, which sets the copay or coinsurance. Generics sit on the lowest tiers and specialty drugs on the highest, often with coinsurance rather than a flat copay.
- Negotiated price
- What the plan and its pharmacy benefit manager have agreed to pay for the drug. It is what you pay at the pharmacy before the deductible is met, and it appears on the explanation of benefits.
- Patient assistance programme
- A manufacturer scheme that supplies a drug free or cheaply based on income. Different from a copay card, which reduces cost sharing for insured patients regardless of income.
Good to know
Four ways to buy the same drug
The same prescription can be bought several different ways, and they are priced by entirely different mechanisms rather than being variations on one price. Through the plan at retail, you pay the negotiated price until your deductible is met and a tier copay or coinsurance after that. Through the plan by 90-day mail order, the same structure applies but many plans price three months at two copays rather than three. At a cash or discount-card price, you step outside the insurance system altogether and pay whatever the pharmacy or the card's network has agreed. With manufacturer copay assistance, a coupon from the drug's maker pays some or all of your cost sharing on a brand-name drug. In this page's example those four routes produce strikingly different annual totals for one drug with a $650 negotiated price, a $45 tier copay, $300 of deductible remaining and twelve fills a year. Retail through the plan costs $840 over the year before assistance and $435 after it. Four 90-day mail order fills at a $90 copay cost $660 before assistance and $0 after it, which makes mail order the cheapest route here. Paying cash at $320 a fill would cost $3,840. The spread between the cheapest and dearest route is larger than most people's entire annual drug budget, and none of it involves changing the drug. What makes this worth checking rather than assuming is that the ranking is not stable across drugs. For an inexpensive generic the cash price often beats any copay. For a specialty drug with coinsurance rather than a copay, the plan route can leave you paying thousands and the manufacturer's assistance becomes the decisive factor. The only way to know is to price your own drug, at your own plan's terms, at the point in the year you are actually at — which is what the fields on this page are for.
Copay accumulators and maximizers
Manufacturer copay assistance was designed to reduce what an insured patient pays at the pharmacy for a brand-name drug, and for a long time it did exactly that: the coupon paid your deductible and coinsurance, and those payments counted toward your deductible and out-of-pocket maximum like any other. Plans and pharmacy benefit managers then introduced designs that separate the two. Under a copay accumulator, the coupon still pays the pharmacy, but its value does not count toward your deductible or out-of-pocket maximum. While the coupon lasts you notice nothing. When it is exhausted — often part-way through the year — you suddenly face the full price with your deductible still ahead of you, because none of the manufacturer's money moved that counter. In this page's example the accumulator is what reduces the value of $3,000 of available assistance to a $405 saving over the year, and it is why only $2,895 of spending ends up credited to the deductible. A copay maximizer works differently again: the plan reclassifies certain high-cost drugs so they fall outside the ACA's cost-sharing limits, sets your cost sharing to match the coupon's maximum annual value, and spreads it across the year, capturing the coupon's full value for the plan. The federal position is unsettled. KFF, in a brief published in October 2024 and updated in August 2025, reported that 'Federal regulations have not yet fully addressed the use of copay adjustment programs'. Twenty states and Washington DC have restricted accumulators for the plans they regulate, which does not reach self-funded employer plans. Prevalence is significant: KFF's 2024 employer survey found accumulators in seventeen percent of large employer plans, rising to thirty-four percent at firms with 5,000 or more workers. Because the answer depends on your state, your plan and whether it is self-funded, this page makes it a field rather than an assumption. Your plan documents, or a direct question to the plan, are the only reliable source.
Cash prices, discount cards and what they cost you elsewhere
It surprises people that a pharmacy will sometimes sell a drug for less than their insurance charges them for it, but it is common, particularly for generics. The test is straightforward: compare the cash or discount-card price with what a single fill costs you through the plan once the deductible is met. In this page's example that plan cost is the $45 copay against a $320 cash price, so insurance wins comfortably and cash would only become the better deal below $45. For a common generic the comparison frequently runs the other way, with a discount card beating a $10 or $15 copay outright. There is a second consideration that the headline price hides. Money you spend at a cash price generally does not count toward your deductible or your out-of-pocket maximum, because the claim never goes through your plan. In a year when you will comfortably stay below both, that costs you nothing and the cheaper price is simply cheaper. In a year when you are heading toward your out-of-pocket maximum — a planned operation, a new diagnosis, a pregnancy — every dollar that fails to count is a dollar you will have to spend again before the plan starts paying in full. A saving of $5 a fill is a poor trade against $500 of deductible progress. Two practical points. First, prices move: discount-card prices change frequently, plans renegotiate, and a drug can shift tier at the start of a plan year, so recheck rather than settling into a habit. Second, you can ask. Pharmacists are permitted to tell you when the cash price is lower than your copay, and asking directly at the counter costs nothing. Combining routes across a year is also legitimate: using insurance while working through a deductible and a discount card afterwards, or the reverse, can both be the right answer depending on what else your year holds.
The deductible reset and the shape of a drug year
For anyone taking a regular medication, the cost of a prescription is not a flat monthly figure but a curve, and the shape of that curve is set by the deductible. On the first day of the plan year the deductible resets to its full amount. Until it is met you generally pay the plan's full negotiated price at the pharmacy — $650 a fill in this page's example — rather than the copay. Once it is met the copay takes over at $45. A drug that cost $45 in November can therefore cost several hundred dollars in January, with no change to the drug, the plan or the prescription. This catches people every year, and it is worth planning for rather than being surprised by. If you know a January refill will cost the full negotiated price, that is a budgeting fact to set aside for in December. If your plan has an out-of-pocket maximum you expect to reach, the early months are when most of it gets paid, and the later months are correspondingly cheap. If your employer's plan year does not start in January — some run from July or from an anniversary date — the reset happens then instead, and it is worth knowing which month yours is. The interaction with copay assistance is where this becomes genuinely expensive. A coupon that covers your cost sharing early in the year, under a plan running an accumulator, leaves your deductible untouched while it lasts. The coupon then runs out mid-year and the deductible arrives all at once, at exactly the moment the help has gone. Knowing the sequence in advance is the difference between an unpleasant month and an emergency. Finally, the ordinary advice about drug costs remains the highest-value thing on this page: ask whether a generic or biosimilar exists, whether the plan has a preferred alternative on a cheaper tier, and whether the manufacturer runs an income-based patient assistance programme. Which drug is right for you is a question for your prescriber, and nothing here is medical advice.
Frequently asked questions
Is it cheaper to pay cash for a prescription than to use insurance?
Sometimes, and the test is simple: compare the cash price with what a fill costs you through the plan once the deductible is met. In this page's example that plan cost is a $45 copay against a $320 cash price, so insurance wins comfortably and cash would only win below $45. For an inexpensive generic the answer often flips. The catch is that money spent at a cash price usually does not count toward your deductible or out-of-pocket maximum, so a marginal saving can cost you in a year when you will reach the maximum anyway.
What is a copay accumulator?
A plan design under which manufacturer copay assistance pays the pharmacy but does not count toward your deductible or out-of-pocket maximum. The coupon covers your cost while it lasts, your deductible stands still, and when the coupon is exhausted you face the full price with the deductible still ahead of you. KFF's 2024 employer survey found accumulators in 17% of large employer plans, rising to 34% at firms with 5,000 or more workers.
Is there a federal rule on copay accumulators?
Not a settled one. KFF reported, in a brief published in October 2024 and updated in August 2025, that 'Federal regulations have not yet fully addressed the use of copay adjustment programs'. Twenty states and Washington DC have restricted accumulators for the plans they regulate, which does not include self-funded employer plans. Because the position varies by state and by plan, this page makes it a field rather than an assumption: check your own plan documents and enter the answer.
How much does manufacturer assistance really save me?
Less than its face value when an accumulator applies. In the example, $3,000 of available assistance reduces what you pay over the year from $840 to $435, a saving of $405, because the coupon's share stops counting toward the deductible and you end up meeting more of it yourself later. Only $2,895 of spending is credited to the deductible across the year. Where the assistance does count, the same coupon goes further, which is why the accumulator question is worth answering precisely.
Is 90-day mail order always cheaper?
Usually, but not always. Many plans price a 90-day supply at two copays rather than three, which is where the saving comes from. In the example, four 90-day fills cost $660 over the year against $840 for twelve monthly fills before any assistance. It suits a drug you take continuously at a settled dose. For a new prescription it is a poor bet, because a 90-day supply you stop taking after three weeks is money gone.
Why does my prescription cost so much more in January?
Because the deductible resets on the first day of the plan year, and until it is met you generally pay the plan's full negotiated price at the pharmacy rather than a copay. In the example the first fills of the year absorb the $300 of remaining deductible before the $45 copay takes over. A drug that costs $45 in November can cost several hundred dollars in January for that reason alone, which is worth planning for rather than being surprised by.
What should I ask about before accepting the price?
Whether a generic or biosimilar exists, since it usually costs a fraction of the brand and needs no coupon; whether the plan has a preferred alternative on a cheaper tier; and whether the manufacturer runs a patient assistance programme, which is means-tested and different from a copay card. Which drug is right for you is a question for your prescriber, not for a calculator, and nothing on this page is medical advice.