Calculator
What Reserved Instances are worth to you.
Your numbers, shareable in one link — 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
Spend a little. Miss nothing.
Pick your size, or drag the slider to your own AWS compute spend. It's the same conservative math Reserver runs against your account — not a best case.
A renewal missed by 14 days on one reservation ≈ $951 — a single prevented miss pays for about 6 months of Reserver.
See my real numbers →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 — 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 quietly 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.
Questions
Questions, answered.
Do you take a percentage of my savings?
No, never. Reserver is a flat monthly price. Percentage-of-savings pricing means your vendor profits most when your bill was worst — we'd rather just charge for the software.
Does Reserver need write access to my AWS account?
Not to watch. The Watch plan uses a read-only IAM role limited to Describe/List calls for RDS, ElastiCache, and EC2. Purchasing on Autopilot uses a separate, tightly-scoped role that can buy reservations and nothing else — it cannot touch your workloads, data, or networking. More in our security model.
We already use Cost Explorer's recommendations. Why Reserver?
Cost Explorer tells you a number and leaves you to reconcile it across three consoles. Reserver matches every reservation to a running instance, shows its work, flags the gaps and expiries, and then makes the purchase a button — or a rule.
I only have a handful of reservations — is Reserver worth it?
Usually, yes. Even a single reservation renewed a couple of weeks late typically costs more than a year of Reserver — Watch is free during early access, and Autopilot is a flat $149/month whether you're tracking ten reservations or ten thousand. Small fleets get the same coverage map and expiry radar as anyone else.
We run many AWS accounts. Does Reserver scale to that?
Yes — that's what Enterprise is for. Connect an AWS Organization and see every account in one coverage map, with SSO/SAML and custom approval chains for procurement. Support for other clouds and AWS Savings Plans is on the roadmap, not shipping today.
Stop overpaying for a steady fleet.
Reserver is in early access. Join the list and we'll onboard you as capacity opens up — first recommendation within minutes of connecting.