BS family · General Purposex86_64 · Intel/AMD

B4ms

The Azure B4ms (Standard_B4ms) is a virtual machine from the Bs series, with 4 vCPUs, 16 GB of RAM and 32 GB of temporary storage. On-demand pricing starts at $0.1660/hour in East US.

Updated September 3, 2026
vCPUs
4
Memory
16 GB
Network
Up to 1–4 Gbps
Storage
32 GB Temp SSD

Save up to $121/mo on every B4ms

Connect Azure — we'll find the optimal pricing model for your workload.

Book a demo Connect Azure — free
Region
Currency
OS
Pricing Overview

The Azure B4ms costs $0.1660/hour ($121.18/month) for Linux and $0.1820/hour ($132.86/month) for Windows in East US, as of 3 September 2026.

All pricing options

East US · USD · Linux OS · monthly = 730 hrs
Prices exclude local taxes
Term / TierHourlyMonthlySavings
Standard Tier — On-Demand
$0.1660$121.18 Baseline
1-Year Reserved Instance
N/AN/A Baseline
3-Year Reserved Instance
N/AN/A Baseline
Spot Instance
N/AN/A Baseline
You could save $121.18/mo on this instance with the right pricing model.
Find my savings

Monthly cost estimator

Estimate your spend based on actual usage.
730 h
1h365h730h (24/7)
1
Estimated monthly
$121.18
730 hrs × $0.1660/hr × 1
Need multi-instance, region mixing, or custom commitments?

Compute

x86_64 · Intel/AMD
vCPUs i4
Memory i16 GB
Physical processorIntel® Xeon® Processor
Nested VirtualizationSupported
Sole TenantSupported
GPUNone
Within BS family
B1s
1 vCPU
B1ls
1 vCPU
B1ms
1 vCPU
B2s
2 vCPU
B2ms
2 vCPU
B4ms
4 vCPU
B8ms
8 vCPU
B12ms
12 vCPU
B16ms
16 vCPU
B20ms
20 vCPU

Lock in this rate across your fleet — typically save 30–40%

Connect your Azure account to apply this pricing logic to every running instance automatically.

Book a demo Connect Azure — free

Networking

Max egress bandwidth1–4 Gbps
Tier 1 bandwidthN/A
Enhanced networking iYes (gvnic/virtio)
IPv6 supportYes (Dual-stack VPC)

Storage

Max persistent disks16
Max disk size32 TB
Local SSDsSupported (Scratch Disk)
Instance storage: Persistent Disk only by default — attach volumes for persistent storage.

Compare with another instance

vs.
SpecB4msB1sΔ
vCPUs41-75%
Memory16 GB1 GB-94%
Hourly Price$0.1660$0.0104-94%
Monthly Price$121.18$7.59-94%
Open full family comparison →
Cost optimization

Azure recommender alerts can cut this bill ~30-40%.

Connect your Azure account. We'll identify every underutilized Bs.* instance and show exactly where downsizing, cleaning up orphaned disks, or shifting to reservations saves money — with zero code changes.

Connect Azure account See sample report
No credit card · 14-day free trial · Read-only access