Savings
Every Reserved Instance is the same bet: pay now, save later.
Term length and payment option are the two levers that decide how big that discount is and how much cash it costs upfront. Here's how each one moves the number, what break-even actually means, and why the math is worth running whether you own one reservation or a thousand.
Two levers, one price
Term and payment option are the whole discount.
A Reserved Instance's discount isn't one fixed number — it's the product of two choices you make at purchase. A longer term buys a deeper discount for more commitment; paying more upfront buys a deeper discount for more cash now. Everything else about the instance stays the same either way.
Payment option: how much you pay now
Illustrative relative discount depth, not a quote — actual rate depends on instance class, region, and service.
Term: how long you commit
Reading break-even
Break-even is the day the upfront cost has paid for itself.
Any reservation with cash paid upfront starts the term "behind" — that money could have just paid on-demand rates instead. Break-even is the day the on-demand cost you'd otherwise have paid catches up to what you spent upfront. Every day after that is pure savings for the rest of the term.
On this single, illustrative instance, the upfront payment breaks even around day 219 of the term — after that, the remaining 146 days are savings against what on-demand would have cost, an effective 40% discount over the full term. No Upfront and Partial Upfront reservations break even faster in cash-flow terms — there's less upfront to recover — but at a shallower discount for the same term.
The multiplier
A small spend on Reserver can prevent a much larger loss.
The math above is per reservation. Run it across a whole fleet and the same relationship holds at a different scale: what Reserver costs is small and fixed; what a fleet leaves on the table by getting term, payment option, or a missed renewal wrong is not.
Illustrative, not a quote — model constants shared with the savings calculator; try your own numbers there.
How this scales with you
The math doesn't get easier because the fleet gets bigger.
A single reservation's discount is still real money against a small bill. The math is simple enough to run by hand once per purchase — the risk is skipping it, not getting it wrong.
Enough purchases that checking term and payment option by hand, every time, stops being realistic. The gap between the right and the merely-adequate choice compounds across dozens of decisions.
Nobody is re-running term-and-payment-option math purchase by purchase at this scale. The recommendation has to already have the math done — with the same assumptions, every time.
The tooling should scale the same way the problem does: one flat price whether the math runs once a year or a thousand times a day — see pricing — never a cut of what you save.
Where Reserver fits
The math, run on your fleet, every time.
Reserver connects to your AWS accounts read-only, scans what's actually running alongside what you already own, and recommends term, payment option, and quantity from that — with the break-even and the dollar figures shown, not just a buy button. It also watches the two things that turn good math into a wasted purchase: coverage that drifts from the target (see the coverage playbook) and terms that lapse unrenewed (see the renewals playbook). See features, how it works, and the security model behind the read-only connection.
How much do Reserved Instances actually save?
It depends on service, instance class, term, and payment option — the published ceilings are up to 72% on EC2, 69% on RDS, and 55% on ElastiCache. Blended across a real fleet's mix of services and terms, savings well into the 30–45% range are typical; Reserver computes the exact figure from your own usage rather than a blended estimate.
Which term saves more, 1-year or 3-year?
3-year is almost always the deeper discount — often meaningfully more than 1-year — because you're trading more certainty for AWS. Whether that trade is worth it is a separate question from the discount size: it depends on whether the instance family is still going to be running in three years.
Which payment option should I pick?
It's a cash-flow choice more than a savings choice. All Upfront gets you the deepest discount for that term, No Upfront gets you the discount with nothing paid at purchase, and Partial Upfront sits between the two. None of them change what's eligible to be reserved — only how much you pay now versus spread across the term.
Is it worth the effort for just a few reservations?
Yes — the percentage discount doesn't get smaller because the fleet is small. A single well-chosen reservation against a modest bill is still real money saved for the life of the term; you don't need scale for the math to matter, you need someone to run it once per purchase.
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.