Calculator
What Reserved Instances are worth to you.
Your numbers, shareable in one link, using the same conservative math Reserver runs against your account. Pick a size or drag the sliders, then copy the link to send it on.
What's it worth
See what reservations save you.
Pick your size, or drag the slider to your own AWS compute spend. The calculator uses the same conservative math Reserver runs on your account.
A renewal missed by 14 days on one reservation ≈ $951. A single prevented miss pays for about 6 months of Autopilot.
Carry these numbers to the waitlist →Carries only the totals shown above, never reservation IDs, ARNs, or account details. Nothing leaves your browser until you submit.
Estimates. Actual savings depend on instance class, term, payment option, and how much of your fleet is steady. Reserver shows the exact math for your account.
Methodology
The math behind the estimate.
No best-case numbers. The calculator above uses the same three assumptions every time. Here they are, in plain view.
of a typical fleet's compute spend is steady enough to reserve. The rest is bursty or already covered, so it's excluded from the estimate entirely.
blended discount across that reservable share. That's a cross-fleet average, not the 55–72% ceiling a single perfectly-matched, all-upfront, 3-year reservation can reach.
flat annual cost for Reserver Autopilot, never a percentage of what you save, whether you're tracking ten reservations or ten thousand.
The "missed renewal" figure takes a representative single reservation's annual saving for the selected size and prorates it by the days a renewal slips. A lapsed reservation reverts to the on-demand rate the moment its term ends, and nothing in the AWS console interrupts you to say so. Real numbers come from a read-only scan of your account, not an estimate: connect a role and Reserver shows the exact math for every instance and reservation you have.
Read more on why renewals slip and how to track them and what an RI actually saves, term by term. Want your own number instead of a blended estimate? TheCoverage Check prices your actual uncovered capacity from real AWS Price List data.
Questions
Questions, answered.
Do you take a percentage of my savings?
No, never. Reserver is a flat price, billed monthly or annually. With percentage-of-savings pricing, the vendor earns the most when your bill was the worst. We charge a fixed price for the software.
Does Reserver need write access to my AWS account?
No. Reserver uses a read-only IAM role limited to Describe/List calls for RDS, ElastiCache, and EC2. It cannot change your workloads, data, or networking. A separate purchase role is on the roadmap. When it ships, it will be opt-in, narrowly scoped, and revocable. More in our security model.
AWS can email me before a reservation expires. Why use Reserver?
The AWS alert is opt-in and off by default. It emails up to 10 addresses 7, 30, or 60 days ahead, and on the day. It only notifies. It does not say what to buy. Reserver shows every end date from every connected account on one screen, and flags the close ones. It then shows the replacement purchase with its break-even date and yearly saving. Reserver does not send the alert itself yet. Email delivery is on the roadmap. Our advice: turn the AWS alert on, and use Reserver to decide what to buy.
We already use Cost Explorer's recommendations. Why Reserver?
Cost Explorer gives you a number. You then check it across three consoles by hand. Reserver matches each reservation to a running instance and shows the math. It flags gaps and expiries, and it tells you what to buy next.
I only have a handful of reservations, is Reserver worth it?
Yes, because Watch is free for one AWS account and any number of reservations. The median reservation in our AWS price data saves about $1,484 a year. Renew it 14 days late and you lose about $57. That loss is small, but on Watch it costs you nothing to prevent. At this size, most of the money is in instances that nobody reserved. On $3,000 a month of compute, that is about $10,530 a year at our conservative rates. If you add more accounts, Autopilot is a flat $149 a month, or $1,490 a year. The price does not change with the number of reservations.
We run many AWS accounts. Does Reserver scale to that?
Yes. Scale is the plan for that. Connect every account you run and see them all in one coverage map. The price is a flat $499 a month, or $4,990 billed once a year, for all accounts. You connect each account individually today. We are still building one-stack AWS Organizations enumeration, SSO/SAML, and custom approval chains. Check the roadmap before you plan around them. If you need an MSA, a security review, or an SLA, Enterprise covers that paperwork. AWS Savings Plans are on the roadmap. They are not live yet.
Is Watch really free forever, or is that an early-access price?
Forever. Watch covers one AWS account, unlimited reservations, and the full coverage map and expiry radar. It is not a trial, and the price does not expire. A paid plan adds more connected accounts, utilization sampling, a notification channel, and team roles. Automated purchasing is not live on any plan yet.
How much time does this actually save?
A Growth-size fleet spends about 39 hours a year tracking reservations by hand. That is $3,705 at a fully loaded rate, split across quarterly reviews, cross-account reconciliation, and purchase decisions. That's about 2× what Autopilot costs a year. Reserver gives back most of that time. A person still approves each purchase.
More free tools
Coverage Check
What are you not reserving?
Try it →Expiry Check
Your real renewal calendar. Right now.
Try it →Renewal exposure
What a missed renewal costs your whole fleet.
Try it →Business case builder
Something to send to whoever signs.
Try it →Size flexibility calculator
One reservation of this size covers what, exactly?
Try it →Term Check
One year or three? Upfront, or not?
Try it →Convertible Check
Convertible costs more. Is it worth it?
Try it →Stop overpaying for a steady fleet.
Reserver is in early access. Join the list, and we will onboard you when we have capacity. Your first recommendation lands within minutes of connecting.