AWS EC2 Cost Estimator
Estimate your monthly AWS EC2 instance costs based on instance type, hours of usage, and storage. Plan your cloud compute budget accurately.
Reserved vs On-Demand Savings Calculator
Compare reserved instance pricing against on-demand rates. Calculate savings from 1-year and 3-year commitments on AWS, Azure, or GCP.
$/hr
On-Demand Total⧉
$3,363.84
$280.32/mo for 12 months
Reserved Total⧉
$2,119.22
$176.60/mo, no upfront
Total Savings⧉
$1,244.62
37.00% less than on-demand
Effective RI Rate⧉
$0.0605/hr
37.00% discount applied
Break-Even Month⧉
Month 1
RI pays for itself
ROI on Upfront⧉
N/A (no upfront)
No upfront to measure ROI
Savings Indicator
37% savings
Excellent savings - Reserved is highly recommended
Cumulative Cost Comparison
| Month | On-Demand Cumulative | Reserved Cumulative | Savings | Status |
|---|---|---|---|---|
| 1 | $280.32 | $176.60 | +$103.72 | Saving |
| 2 | $560.64 | $353.20 | +$207.44 | Saving |
| 3 | $840.96 | $529.80 | +$311.16 | Saving |
| 4 | $1,121.28 | $706.41 | +$414.87 | Saving |
| 5 | $1,401.60 | $883.01 | +$518.59 | Saving |
| 6 | $1,681.92 | $1,059.61 | +$622.31 | Saving |
| 7 | $1,962.24 | $1,236.21 | +$726.03 | Saving |
| 8 | $2,242.56 | $1,412.81 | +$829.75 | Saving |
| 9 | $2,522.88 | $1,589.41 | +$933.47 | Saving |
| 10 | $2,803.20 | $1,766.02 | +$1,037.18 | Saving |
| 11 | $3,083.52 | $1,942.62 | +$1,140.90 | Saving |
| 12 | $3,363.84 | $2,119.22 | +$1,244.62 | Saving |
Payment Option Comparison
| Option | Upfront | Monthly | Total Cost | Savings vs OD |
|---|---|---|---|---|
| On-Demand | $0.00 | $280.32 | $3,363.84 | - |
| No Upfront RI | $0.00 | $176.60 | $2,119.22 | $1,244.62 |
| Partial Upfront RI | $953.65 | $97.13 | $2,119.22 | $1,244.62 |
| All Upfront RI | $2,119.22 | $0.00 | $2,119.22 | $1,244.62 |
Planning notes, formulas, and examples
About the Reserved vs On-Demand Savings Calculator
Reserved Instances (RIs) and Savings Plans offer significant discounts over on-demand pricing — typically 30–72% depending on the commitment term and payment option. However, committing upfront means paying for capacity whether you use it or not, so the decision requires careful analysis.
This calculator compares your on-demand spend against reserved pricing to show total savings, effective hourly rate, and break-even utilization. Enter your current on-demand rate, the reserved rate, any upfront payment, and your expected usage to see whether committing makes financial sense.
The analysis works for AWS Reserved Instances, Azure Reserved VM Instances, GCP Committed Use Discounts, and any provider offering commitment-based pricing. Understanding the break-even point helps you commit confidently to capacity you know you'll use.
When This Page Helps
Committing to reserved capacity is the single biggest cost optimization for steady-state cloud workloads. But committing to the wrong amount wastes money on unused reservations. This calculator helps you determine exactly how much to reserve by showing savings at different utilization levels and identifying the break-even point.
How to Use the Inputs
- Enter the on-demand hourly rate for your instance type.
- Enter the reserved hourly rate (from your provider's pricing page).
- Enter any upfront payment required for the reservation.
- Set the commitment term in months (12 for 1-year, 36 for 3-year).
- Enter your expected hours of usage per month.
- Compare total costs and savings over the commitment period.
Formula used
On-Demand Total = on_demand_rate × hours_per_month × term_months
Reserved Total = upfront + (reserved_rate × hours_per_month × term_months)
Savings = On-Demand Total − Reserved Total
Savings % = (Savings / On-Demand Total) × 100Example Calculation
Result: $244.40 saved (24.3%)
On-demand cost for 12 months: $0.10 × 730 × 12 = $876. Reserved cost: $500 upfront + $0.06 × 730 × 12 = $500 + $525.60 = $1,025.60. Wait — in this case the upfront is too high. With a lower upfront of $0, reserved total would be $525.60, saving $350.40 (40%). The break-even utilization would need careful analysis.
Tips & Best Practices
- Only reserve capacity for workloads with predictable, steady-state usage.
- Start with 1-year terms until you're confident in your usage patterns.
- All-upfront payment gives the deepest discount but ties up capital.
- No-upfront reservations offer flexibility with smaller but still meaningful savings.
- AWS Savings Plans are more flexible than RIs and can apply across instance families.
- Review utilization reports quarterly and adjust reservations at renewal time.
- Unused reservations can sometimes be sold on the AWS Reserved Instance Marketplace.
When Reserved Pricing Makes Sense
Reserved pricing is ideal for baseline capacity that runs 24/7 — databases, application servers, monitoring infrastructure, and other always-on workloads. The key requirement is predictability: you need to be reasonably confident the workload will continue for the commitment term.
Understanding Payment Options
Most providers offer three payment tiers: no upfront (monthly payments only), partial upfront (some upfront plus reduced monthly), and all upfront (single payment for the entire term). The more you pay upfront, the larger your discount. Consider your organization's cash position and the time value of money when choosing.
Building a Reservation Strategy
Start by analyzing 3–6 months of usage data to identify steady-state baselines. Reserve only the minimum consistent usage, leaving variable demand on on-demand or spot pricing. Review and adjust quarterly. A common split is 60–70% reserved, 20–30% on-demand, and 5–10% spot.
Sources & Methodology
Last updated:
Frequently Asked Questions
AWS 1-year no-upfront RIs save about 30–40%, 1-year all-upfront save about 40%, and 3-year all-upfront can save up to 72%. Azure and GCP offer similar discount tiers.
You still pay the reserved rate for the committed capacity regardless of usage. This is why it's important to only reserve capacity you're confident you'll use. Any usage above the reservation is billed at on-demand rates.
Generally no. AWS allows selling unused RIs on their marketplace. Azure allows some cancellations with an early termination fee. GCP committed use discounts cannot be cancelled. Plan carefully before committing.
All-upfront gives the biggest discount but locks up cash. No-upfront preserves cash flow with smaller savings. For most businesses, partial upfront offers a good balance of savings and cash flexibility.
Break-even is the minimum utilization percentage where reserved pricing becomes cheaper than on-demand. For most 1-year no-upfront RIs, break-even is around 40–50% utilization. Below that, on-demand is actually cheaper.
AWS Savings Plans offer similar discounts with more flexibility — they can apply across instance families, regions, and even services (EC2, Fargate, Lambda). They're generally recommended over traditional RIs for most use cases.
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