How many hours are in a month for EC2 billing?

AWS uses actual hours consumed, but for estimation purposes 730 hours (365 days × 24 hours / 12 months) is the standard approximation for an always-on instance running the entire month. Consulting relevant industry guidelines or professional resources can provide additional context tailored to your specific circumstances and constraints.

Does this include data transfer costs?

No. Data transfer (especially egress) is billed separately and can be significant. Use the Cloud Egress Cost Calculator or Data Transfer Cost Calculator to estimate those charges.

What about Elastic IP charges?

Elastic IPs are free when attached to a running instance. If an EIP is allocated but not associated, AWS charges approximately $0.005/hour ($3.65/month). This calculator focuses on compute and storage costs.

How do I find the hourly price for my instance type?

Visit the AWS EC2 Pricing page and select your region. Prices vary by region, with US East (N. Virginia) typically being the cheapest. You can also use the AWS Pricing API for programmatic access.

Are there additional costs beyond compute and storage?

Yes. Common additions include data transfer out, Elastic Load Balancers, CloudWatch monitoring, snapshots, and any attached services like RDS or ElastiCache. This calculator covers the core EC2 compute and EBS storage components.

How accurate is this estimate?

For steady-state workloads running a fixed number of instances, this is very accurate. For auto-scaling workloads, actual costs depend on scaling events. Use this as a baseline and add a 10–20% buffer for variable workloads.

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.

Instance Type

Pricing Model

Number of Instances

Hours per Month

hrs

Data Transfer Out

EBS Volume Type

EBS Storage per Instance

EBS Snapshots

Total Monthly Cost

$436.98

Compute + Storage + Transfer + Snapshots

Annual Estimate

$5,243.78

12-month projection

Compute Cost

$355.07/mo

4x m5.xlarge at $0.1216/hr

Storage Cost

$32.00/mo

100.00 GB gp3 per instance

Data Transfer

$44.91/mo

500.00 GB out at $0.09/GB

Snapshot Cost

$5.00/mo

100.00 GB at $0.05/GB

Savings vs On-Demand

$205.57/mo

0.32% savings ($2,466.82/yr)

Effective $/hr/Instance

$0.1497

All-in cost per instance-hour

Cost Breakdown

Compute

$355.07 (0.81%)

EBS Storage

$32.00 (0.07%)

Snapshots

$5.00 (0.01%)

Data Transfer

$44.91 (0.10%)

Pricing Model Comparison

Pricing	Hourly Rate	Monthly Compute	Monthly Total	Annual Total	Savings
On-Demand	$0.192	$560.64	$642.55	$7,710.60	-
Reserved (1-yr) (current)	$0.1216	$355.07	$436.98	$5,243.78	$205.57/mo
Reserved (3-yr)	$0.0752	$219.58	$301.49	$3,617.93	$341.06/mo
Spot (~70% off)	$0.0576	$168.19	$250.10	$3,001.22	$392.45/mo

Instance Type Reference

Instance	vCPU	RAM (GB)	On-Demand	RI 1-yr	RI 3-yr	Monthly (730h)
t3.micro	2	1	$0.0104	$0.0066	$0.0042	$7.59
t3.small	2	2	$0.0208	$0.0132	$0.0083	$15.18
t3.medium	2	4	$0.0416	$0.0264	$0.0166	$30.37
t3.large	2	8	$0.0832	$0.0528	$0.0333	$60.74
t3.xlarge	4	16	$0.1664	$0.1056	$0.0666	$121.47
m5.large	2	8	$0.0960	$0.0608	$0.0376	$70.08
m5.xlarge *	4	16	$0.1920	$0.1216	$0.0752	$140.16
m5.2xlarge	8	32	$0.3840	$0.2432	$0.1504	$280.32
c5.large	2	4	$0.0850	$0.0540	$0.0340	$62.05
c5.xlarge	4	8	$0.1700	$0.1080	$0.0670	$124.10
c5.2xlarge	8	16	$0.3400	$0.2160	$0.1340	$248.20
r5.large	2	16	$0.1260	$0.0800	$0.0500	$91.98
r5.xlarge	4	32	$0.2520	$0.1600	$0.0990	$183.96

Scaling Projection

Instances	Compute	Storage	Total Monthly	Annual
1	$88.77	$8.00	$146.68	$1,760.14
2	$177.54	$16.00	$243.45	$2,921.35
4 (current)	$355.07	$32.00	$436.98	$5,243.78
8	$710.14	$64.00	$824.05	$9,888.65
16	$1,420.29	$128.00	$1,598.20	$19,178.38
32	$2,840.58	$256.00	$3,146.49	$37,757.83

Planning notes, formulas, and examples

About the AWS EC2 Cost Estimator

Amazon EC2 (Elastic Compute Cloud) is the backbone of most AWS deployments, but costs can spiral quickly if you don't estimate them upfront. This calculator helps you project your monthly EC2 spend based on instance pricing, hours of operation, number of instances, and attached EBS storage.

Whether you're running a single development server or a fleet of production instances, knowing your projected costs helps you budget effectively and avoid bill shock. EC2 pricing varies dramatically based on instance family, size, and region — a t3.micro costs pennies per hour while a p4d.24xlarge GPU instance runs over $30/hour.

Use this estimator alongside the Reserved vs On-Demand and Spot Instance calculators to identify the most cost-effective purchasing strategy for your workloads.

When This Page Helps

EC2 is typically the largest line item on an AWS bill. Without accurate cost projections, teams routinely overspend by 30–50%. This calculator lets you model different instance types, quantities, and usage patterns before you deploy, helping you right-size from day one and set meaningful budget alerts.

How to Use the Inputs

Enter the hourly price for your chosen EC2 instance type (find pricing on the AWS EC2 pricing page).
Set the number of instances you plan to run.
Enter the hours per month each instance will run (730 for 24/7 operation).
Optionally add EBS storage volume size in GB and its per-GB monthly rate.
Review the total monthly cost breakdown.
Adjust instance count or hours to model different scenarios.

Formula used

Monthly Compute = instance_price_per_hour × hours_per_month × instance_count
Monthly Storage = EBS_GB × EBS_rate_per_GB
Total Monthly Cost = Monthly Compute + Monthly Storage

Example Calculation

Result: $121.10/month

Three t3.medium instances at $0.0416/hr running 24/7 (730 hours) cost $91.10 in compute. Adding 100 GB of EBS storage at $0.10/GB adds $10.00 per instance ($30.00 total), bringing the monthly total to $121.10.

Tips & Best Practices

Use 730 hours for always-on workloads (24 × 365 / 12 ≈ 730).
Check the latest pricing on the AWS website as rates change frequently.
Consider Reserved Instances for steady-state workloads to save 30–72%.
Factor in data transfer costs separately using the Data Transfer Cost Calculator.
Use AWS Cost Explorer after deployment to compare estimates to actuals.
Remember that stopped instances still incur EBS storage charges.

Understanding EC2 Pricing Models

AWS offers several pricing models for EC2: On-Demand (pay by the hour with no commitment), Reserved Instances (1–3 year commitments at 30–72% discount), Spot Instances (up to 90% discount but can be interrupted), and Savings Plans (flexible commitment-based discounts). This calculator models On-Demand pricing as the baseline.

Choosing the Right Instance Type

EC2 offers hundreds of instance types optimized for different workloads. General-purpose instances (t3, m5) work for most applications. Compute-optimized (c5) suits CPU-intensive tasks. Memory-optimized (r5) handles databases and caching. GPU instances (p4, g5) power machine learning. Start small, monitor utilization, and right-size based on actual usage.

Controlling EC2 Costs

The biggest cost optimization strategies include right-sizing instances based on actual CPU and memory utilization, using Reserved Instances or Savings Plans for predictable workloads, leveraging Spot Instances for fault-tolerant batch processing, and scheduling non-production instances to stop during off-hours. Combining these strategies can reduce EC2 spend by 50–70%.

Sources & Methodology

Last updated: February 8, 2026

Frequently Asked Questions

AWS uses actual hours consumed, but for estimation purposes 730 hours (365 days × 24 hours / 12 months) is the standard approximation for an always-on instance running the entire month. Consulting relevant industry guidelines or professional resources can provide additional context tailored to your specific circumstances and constraints.