How the subscribe & save vs promo code calculator works
Enter the item price
Start with the current item price before Subscribe & Save or coupon reductions. Use the price you would otherwise pay for each purchase so the comparison begins from the same base.
Choose the subscription discount
Enter the Subscribe & Save percentage shown for your planned order, such as 5% or 15%. Discount eligibility can change, so check the current terms and your checkout details.
Add any coupon percent
If an eligible percentage coupon appears, enter it as a separate discount. The calculator applies it after the subscription percentage, but Amazon's current terms decide whether that combination actually applies.
Set yearly deliveries
Enter how many deliveries you expect during one year. The calculator multiplies the discounted delivery price by that count and compares it with buying the same quantity without a subscription.
Subscribe & Save vs Promo Code Calculator formula, with worked examples
The calculator applies each percentage to the price left after the previous reduction. It then multiplies that discounted price by your planned yearly deliveries. Savings are measured against buying the same number of units at the original entered price without a subscription discount.
price_after = price x (1 - sns_pct) x (1 - coupon_pct) annual_total = price_after x deliveries savings = (price x deliveries) - annual_total
15% off for 12 deliveries
Example: the item price is $24.99 and the Subscribe & Save discount is 15%. Price after discount is $24.99 x 0.85 = $21.2415, displayed as $21.24. Twelve deliveries cost $24.99 x 0.85 x 12 = $254.898, displayed as $254.90. Buying 12 times at $24.99 costs $299.88. Savings are $299.88 - $254.898 = $44.982, displayed as $44.98.
5% off plus coupon
Example: a $40 item gets 5% Subscribe & Save and an additional 10% coupon. Price after both reductions is $40 x 0.95 x 0.90 = $34.20. Six deliveries cost $34.20 x 6 = $205.20. Buying six times at $40 costs $240. Savings are $240 - $205.20 = $34.80.
Subscribe and Save totals over N deliveries
| Deliveries | One-time purchases | 5% Subscribe & Save | 15% Subscribe & Save |
|---|---|---|---|
| 3 | $90.00 | $85.50 | $76.50 |
| 6 | $180.00 | $171.00 | $153.00 |
| 12 | $360.00 | $342.00 | $306.00 |
The totals assume the entered $30 price and selected percentage stay unchanged across all deliveries.
When a subscription is NOT cheaper
| List price | 15% S&S price | One-time offer | One-time price | Lower price |
|---|---|---|---|---|
| $20.00 | $17.00 | 20% coupon | $16.00 | One-time purchase |
| $30.00 | $25.50 | 20% coupon | $24.00 | One-time purchase |
| $50.00 | $42.50 | Sale to $39.00 | $39.00 | One-time purchase |
| $80.00 | $68.00 | Sale to $64.00 | $64.00 | One-time purchase |
Verdict. A 15% subscription discount is not automatically the lowest price, so compare it with the current one-time offer before ordering.
When a subscribe & save result can mislead you
Prices changing between deliveries
The item price can be different when a later delivery is processed, so a calculation based on today's price may not match the future charge. Your yearly estimate is only as stable as the entered price. Fix: re-run the calculator whenever the item price changes.
Assuming the higher tier
A higher Subscribe & Save percentage may depend on meeting current eligibility requirements, including a qualifying number of subscriptions in a delivery period. Those requirements can change. Fix: enter only the discount currently shown for your order and check the current terms.
Buying more than needed
A lower unit price does not create savings if deliveries arrive faster than you use the product. Extra inventory can turn into wasted spending or clutter. Fix: re-run the calculator with fewer yearly deliveries and choose a frequency closer to actual use.
Assuming coupons always stack
The calculator can mathematically combine a Subscribe & Save percentage with an extra coupon, but that does not confirm Amazon will apply both. Coupon eligibility can vary. Fix: check the current terms and remove any coupon that does not appear at checkout.
Forgetting upcoming deliveries
A subscription can continue producing purchases after you stop needing the item if you do not review future orders. That can erase earlier savings. Fix: check upcoming deliveries regularly, then skip, change, or cancel according to the current account options.
Who uses a subscribe & save calculator
Routine household buyers
You can estimate the annual cost of frequently purchased household products before committing to recurring deliveries. Compare the calculated subscription total with buying the same number of items individually throughout the year.
Budget planners
You can convert a percentage discount into a clearer yearly dollar amount. Seeing the annual total makes it easier to decide whether recurring purchases fit your budget better than occasional one-time orders.
Coupon shoppers
You can test a subscription percentage with an optional coupon and compare that result with a one-time promotion. This helps separate the advertised discount percentages from the actual dollars you would spend.
Bulk purchase comparers
You can compare several smaller recurring orders with the equivalent number of regular purchases. Adjust the delivery count to reflect how quickly you use the item instead of assuming more deliveries always create better value.
8 ways to get more from this calculator
Test both discount tiers
Re-run the calculator once with 5% and again with 15% while keeping the item price and delivery count unchanged. The difference shows exactly how much the higher tier would save if your order qualifies under the current terms.
Remove the extra coupon
Re-run the calculator with the coupon percentage set to zero. Compare that annual total with the version that includes the coupon so you can see how much of the projected savings depends on that additional offer.
Reduce yearly deliveries
Re-run the calculator with fewer deliveries if the first estimate creates more product than you normally use. Compare the annual totals and choose a schedule based on expected consumption, not only the lower discounted price per delivery.
Increase yearly deliveries carefully
Re-run the calculator with a higher delivery count if you regularly reorder before the next shipment. Compare the new annual cost with your current buying pattern, then make sure the extra quantity reflects real use rather than stockpiling.
Use the current item price
Re-run the calculator whenever the listed item price changes. Replace the old base price with the new one while keeping your discounts and delivery count the same, then compare the updated annual cost with your previous estimate.
Compare against a sale
Re-run the calculator using the current one-time sale price as your comparison point. Keep your subscription calculation separate, then compare the resulting purchase prices before deciding which option costs less for that specific order.
Compare coupon alternatives
Re-run the calculator with each available coupon percentage separately rather than combining offers you are unsure about. Compare the final delivery prices, then use the version that matches the coupon actually accepted under the current terms.
Model a skipped delivery
Re-run the calculator with one fewer yearly delivery if you expect to skip an order. This gives you a more realistic annual total and prevents the projected savings from depending on a shipment you probably will not need.
Common problems and fixes
My Amazon price is different from the calculator.
The item price, discount percentage, coupon eligibility, or delivery terms may have changed. Replace the calculator inputs with the values currently shown in your account or checkout, then re-run the estimate using the same delivery count.
My 15% discount is not showing.
Your order may not meet the current requirements for that discount level. Do not assume the higher rate applies. Change the calculator to the percentage actually displayed for your subscription, then check the current Subscribe & Save terms.
My coupon disappeared at checkout.
The extra coupon may no longer be eligible or may not combine with the subscription under the current terms. Set the coupon percentage to zero, re-run the calculation, and compare the revised subscription price with the one-time option.
My annual savings look too high.
The delivery count may be higher than your real purchase frequency, or the calculation may include a coupon that will not repeat. Reduce deliveries or remove the coupon, then re-run the calculator with a more conservative set of inputs.
I am receiving products too often.
Your delivery schedule is probably faster than your actual usage. Lower the yearly delivery count in the calculator and compare the new annual total. Then adjust, skip, or cancel future orders using the options currently available in your account.
Frequently asked questions
How much does 15% Subscribe & Save save?
It saves 15% from the price base used for that discount. Example: 15% off $30 is $4.50, leaving $25.50. The qualifier is that eligibility and future prices can change. Enter the current item price and displayed percentage before comparing totals.
How much does 5% Subscribe & Save save?
It saves 5% from the entered price. Example: 5% off $30 is $1.50, so the discounted price is $28.50. The actual Amazon charge can depend on current pricing and eligibility. Use the percentage shown for your order.
Can I add a coupon to Subscribe & Save?
Yes, the calculator can model both percentages. Example: $40 with 5% off and another 10% off becomes $40 x 0.95 x 0.90 = $34.20. Amazon decides whether both apply. Check the current terms and your checkout.
Do 15% and 10% equal 25% off?
No. On a $100 item, 15% off leaves $85, then 10% off leaves $76.50. The real combined discount is 23.5%. This assumes both percentages apply sequentially. Enter each percentage separately instead of adding them together.
How do I calculate annual Subscribe & Save cost?
Multiply the discounted delivery price by the number of yearly deliveries. Example: $30 at 15% off costs $25.50, and 12 deliveries cost $306. Prices can change between shipments. Re-run the estimate when the item price changes.
How many deliveries are in a monthly subscription?
A full year of one delivery each month is 12 deliveries. The qualifier is that you may skip, reschedule, or use another interval under the current options. Enter 12 only if you actually expect 12 purchases during the year.
Is 15% Subscribe & Save always cheaper?
No. Example: a $30 item at 15% off costs $25.50, while a one-time 20% coupon reduces $30 to $24. Current sales can also change the comparison. Check both purchase options before placing the order.
Does the calculator include tax?
No. Example: if the discounted merchandise price is $25.50, the calculator uses $25.50 before any tax added by checkout. Tax treatment varies by order and location. Compare the calculated merchandise total with the pre-tax amount shown at checkout.
Does the calculator include shipping?
No. The calculator compares item prices and entered discounts only. Example: a $30 item at 5% becomes $28.50 before separate shipping charges. Shipping eligibility can change. Review any shipping amount independently on the checkout page.
Does the same coupon repeat every delivery?
Not necessarily. A coupon shown on one order should not be assumed to repeat across future deliveries. For a conservative estimate, re-run the calculator with the coupon set to 0% and compare that annual total with the coupon version.
What if the item price changes later?
Your future total changes with it. Example: 15% off $30 is $25.50, while 15% off $40 is $34. The percentage is the same, but the charge differs. Update the base price and re-run the calculator whenever pricing changes.
Should I use 5% or 15% in the calculator?
Use the percentage currently shown for the order you are evaluating. Example: entering 5% on a $30 item gives $28.50, while 15% gives $25.50. Do not assume eligibility for either rate. Check the current terms before choosing the input.
More free shopping tools
Coupon Stacking Calculator
Add every discount you have (clip coupon, promo code, Subscribe & Save) and see the final price, the total you save and the real percent off.
Unit Price Calculator
Compare the price per ounce, per pound, per fluid ounce or per count to find the real best value, even when the pack sizes are different.
Looking for a deal to plug in? Browse today's Amazon promo codes, deals 50% off or more or all free tools.
How we calculate
This subscribe and save calculator uses simple percentage arithmetic based only on the numbers you enter. It multiplies the item price by the remaining percentage after the Subscribe & Save discount, then applies any entered coupon percentage to the reduced amount. It multiplies that result by your delivery count to estimate the annual total. Savings equal the cost of the same number of full-price purchases minus the calculated subscription total. Calculations use full precision during the math, while displayed dollar values are rounded to the nearest cent. Tax, shipping, future price changes, and Amazon eligibility rules are not predicted. Check the current terms and checkout details before buying.
Reviewed October 2026 by the Today Coupon List editors. Estimates only: store terms and exclusions apply, so confirm the final price at checkout.
