How many unique visitors per day visit your website or app?
Free Cloud Right-Sizing Tool
Which Cloud Instance
Do You Actually Need?
Tell us your daily visitors, app type, and traffic pattern. We recommend the exact AWS, GCP and Azure instances across budget, balanced, and high-availability tiers.
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Spiky traffic needs 3x more capacity than steady traffic for the same daily visitor count.
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Java needs 5x more resources than a static site for the same traffic. Different stacks have very different CPU and RAM needs.
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Co-located DB increases RAM by ~35% and CPU by ~35%.
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How to choose the right EC2 instance size
Why traffic pattern matters more than raw visitor count
10,000 steady visitors spread over 24 hours is very different from 10,000 visitors spiking in a 2-hour window. Spiky traffic requires 3x more server capacity for the same total daily visitors.
App type drives resource requirements
A Java Spring Boot app needs 4-5x more RAM than an equivalent Node.js app due to JVM overhead. AI inference apps may need 10x more CPU than a static site serving identical traffic.
Budget vs Balanced vs Production HA
Budget tiers are great for staging or low-traffic production. Balanced gives 1.4x headroom for traffic spikes. Production HA (2 instances + load balancer) provides zero-downtime deploys and automatic failover.
AWS Graviton ARM instances
AWS Graviton (t4g, m7g, r7g) instances typically offer 20-40% better price/performance vs equivalent x86 instances. Most modern software runs natively on ARM.
Growth planning ladder
The growth ladder in each recommendation shows exactly which instance to upgrade to at 3x and 10x your current traffic — plan ahead without over-provisioning today.
Already running on AWS?
This calculator estimates what you need. CostSave looks at your actual CloudWatch CPU histograms and flags instances running at under 20% load — saving you real money every month.
Common sizing reference
| Use Case | AWS | GCP | Azure | Est. Monthly |
|---|---|---|---|---|
| Small blog, 500/day | t4g.micro | e2-micro | B1s | ~$6-8 |
| WordPress, 3K/day | t4g.medium | e2-standard-2 | B2s | ~$24-49 |
| Node.js API, 15K/day | m7g.large | n2d-standard-2 | D2as v5 | ~$59-70 |
| Java/Spring Boot, 5K/day | r7g.large | n2-highmem-2 | E2s v5 | ~$77-99 |
| E-commerce, 20K/day | m7g.xlarge | n2-standard-4 | D4s v5 | ~$118-141 |