RAID Capacity Calculator

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RAID Capacity Calculator

Calculate estimated usable storage capacity for a RAID array based on the number of drives, drive size, RAID level, and filesystem overhead.
Usable Capacity:
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What the RAID Capacity Calculator does

The RAID Capacity Calculator is a simple way to estimate how much usable storage you can expect from a RAID array after accounting for redundancy and filesystem overhead. If you are planning a NAS, a small business server, or a storage pool for media, backups, or virtualization, this tool helps you answer one of the first questions that matters: how much space will actually be available?

RAID setups are designed to improve performance, reliability, or both, but the tradeoff is that not all installed drive capacity becomes usable. Some capacity is reserved for parity or other redundancy structures, depending on the RAID level you choose. In addition, filesystems such as NTFS, ext4, ZFS, or XFS may consume a small amount of space for metadata and overhead. The result is that the total capacity shown by your drive labels is not the same as the capacity you can store data on.

This RAID capacity calculator helps estimate:

  • Total raw drive capacity
  • Capacity lost to parity or redundancy
  • Filesystem overhead impact
  • Final usable capacity for planning and budgeting

The calculator is especially useful when you are comparing RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, or any other layout where redundancy changes usable storage. It gives a practical estimate so you can avoid overbuying or underestimating your storage needs.

How to use the RAID Capacity Calculator

Using the RAID Capacity Calculator is straightforward. Enter the values that match your planned array, and the tool will estimate the Usable Capacity.

  1. Enter the Number of Drives
    Input how many physical drives will be in the RAID array.
  2. Enter the Drive Size (TB)
    Provide the capacity of each drive in terabytes. For example, 4 TB, 8 TB, or 18 TB.
  3. Select the RAID Level
    Choose the RAID level you plan to use. Different RAID levels affect how many drives are reserved for redundancy.
  4. Set the Parity/Redundancy Drives
    Specify how many drives’ worth of capacity will be used for parity or mirrored redundancy.
  5. Choose the Filesystem Overhead (%)
    Enter the percentage of space expected to be consumed by filesystem overhead. This helps refine the estimate.

After entering these values, the calculator returns the Usable Capacity. This is the estimated storage you can use for files, databases, virtual machines, backups, or media libraries.

Here are a few practical tips when entering data:

  • Use the actual usable per-drive size you expect from the manufacturer, not the marketing number if your workflow needs extra accuracy.
  • Double-check the parity or redundancy drives value based on the RAID level.
  • If you are unsure about filesystem overhead, use a conservative estimate such as 1% to 10%, depending on the filesystem and workload.
  • Keep in mind that real-world usable space can also be affected by formatting, reserved blocks, snapshots, and hot spares.

How the RAID Capacity Calculator formula works

The formula used by the RAID Capacity Calculator is:

((drive_count * drive_size_tb) – (parity_drives * drive_size_tb)) * (1 – filesystem_overhead_percent / 100)

Let’s break it down step by step.

  • drive_count * drive_size_tb
    This calculates the total raw capacity of all drives combined.
  • parity_drives * drive_size_tb
    This calculates the amount of capacity reserved for parity or redundancy.
  • Subtracting parity capacity
    This leaves the estimated storage available before filesystem overhead.
  • (1 – filesystem_overhead_percent / 100)
    This reduces the remaining capacity based on overhead from the filesystem.

For example, imagine you have:

  • 6 drives
  • Each drive is 8 TB
  • 1 parity drive
  • 3% filesystem overhead

The calculation would be:

((6 × 8) – (1 × 8)) × (1 – 3/100)

(48 – 8) × 0.97 = 40 × 0.97 = 38.8 TB

So the estimated Usable Capacity would be 38.8 TB.

That number is useful for planning, but it is still an estimate. In practice, the actual available space may vary slightly depending on RAID controller behavior, filesystem choice, and reserved system space.

Use cases for the RAID Capacity Calculator

The RAID Capacity Calculator is valuable in many real-world scenarios. Whether you are building a home lab or managing a production environment, knowing your usable storage ahead of time can save time, money, and confusion.

  • Home NAS planning
    Estimate how much space you will have for movies, photos, documents, and personal backups.
  • Small business storage design
    Determine whether a proposed array can support office files, databases, and shared projects.
  • Server and virtualization planning
    Check whether the array has enough capacity for VMs, containers, and snapshots.
  • Backup infrastructure
    Make sure the RAID setup can hold backup images, retention copies, and archived data.
  • Media and content libraries
    Estimate usable space for large video, audio, and photo collections.
  • Upgrade comparisons
    Compare different drive counts, RAID levels, or drive sizes before purchasing hardware.

This calculator is also useful when comparing the impact of different RAID strategies. For example, a RAID 5 setup may provide more usable space than RAID 10, while RAID 10 may offer better performance and resilience in some environments. The right choice depends on your priorities, and this tool helps you quantify the storage tradeoff.

Other factors to consider when calculating Usable Capacity

While the RAID Capacity Calculator provides a solid estimate, several additional factors can influence the final amount of usable storage you see in a real deployment. Understanding these details can help you avoid surprises later.

  • Drive size labeling differences
    Manufacturers often use decimal terabytes, while operating systems may display capacity differently. This can make reported storage look slightly smaller than expected.
  • Hot spares
    If one or more drives are reserved as hot spares, they do not contribute to usable capacity.
  • RAID controller overhead
    Some hardware RAID controllers and storage appliances reserve additional metadata or cache-related space.
  • Filesystem reserved blocks
    Certain filesystems reserve space for system use, which reduces user-available capacity.
  • Snapshots and replication
    If your storage system uses snapshots, clones, or replication, those features can consume capacity over time.
  • Mixed drive sizes
    This calculator assumes equal drive sizes. If your array uses mixed capacities, actual usable space may be more limited.
  • Rebuild and expansion behavior
    Some RAID systems may temporarily reduce performance or require additional headroom during rebuilds or expansion.

To get the most realistic result, always compare the calculator’s estimate with the documentation for your RAID controller, NAS appliance, or filesystem. That combination gives you the clearest picture of expected storage capacity.

FAQ

What is usable capacity in RAID?

Usable capacity is the amount of storage you can actually store data on after subtracting parity, mirroring, and filesystem overhead. It is different from raw capacity, which is the total size of all installed drives combined.

Why is RAID capacity smaller than total drive capacity?

RAID reserves part of the total storage for redundancy or parity. This protects data in case of a drive failure, but it also reduces the amount of space available for files and applications.

Does filesystem overhead really matter?

Yes, especially in larger arrays or specialized environments. Even a small percentage of overhead can amount to a significant number of gigabytes or terabytes on big storage systems. Including it makes the estimate more accurate.

Can I use this RAID Capacity Calculator for SSDs?

Yes. The same logic applies to SSD-based RAID arrays. Just enter the number of drives, drive size, RAID level, parity drives, and filesystem overhead to estimate Usable Capacity.

Is the result exact?

No, it is an estimate. Actual usable space can vary based on drive formatting, RAID implementation, reserved system space, snapshots, and other storage features. However, it is very useful for planning and comparison.

If you are evaluating a new storage build, the RAID Capacity Calculator can help you make smarter decisions before buying hardware. By estimating Usable Capacity upfront, you can choose the right RAID level, the right drive count, and the right filesystem strategy for your needs.

Support this tool
Buy us a coffee
If this RAID Capacity Calculator helped you, support the site with a small donation. It keeps the tools on the site free and supports ongoing improvements.

Buy us a coffee

Secure donation via Gumroad

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CPU Instruction Throughput Calculator Estimate effective CPU instruction throughput in instructions per second based on clock frequency, instructions retired per cycle, active core count, SMT efficiency, and workload efficiency. Try it → CPU Instruction Throughput Calculator
CPU Cycles Per Second Calculator Estimate the total CPU cycles executed per second using clock speed, cores, threads per core, average utilization, and instructions per cycle. Try it → CPU Cycles Per Second Calculator
CPU Cores to Threads Calculator Estimate the total number of CPU threads based on physical core count, sockets, and simultaneous multithreading or hyper-threading level. Try it → CPU Cores to Threads Calculator
CPU Core Utilization Calculator Estimate average CPU core utilization based on total CPU usage, number of logical cores, runnable workload threads, and a virtualization overhead factor. Try it → CPU Core Utilization Calculator
CPU Thermal Margin Calculator Estimate CPU thermal margin by comparing the CPU's maximum safe temperature to the expected operating temperature based on ambient conditions, CPU package power, cooler performance, and case airflow efficiency. Try it → CPU Thermal Margin Calculator
CPU Performance Calculator Estimate a relative CPU performance score using clock speed, core count, threads, instructions per clock, and workload type. Try it → CPU Performance Calculator
CPU Temperature Conversion Calculator Convert CPU temperature readings between Celsius, Fahrenheit, and Kelvin. Try it → CPU Temperature Conversion Calculator
CPU Power Consumption Calculator Estimate CPU power consumption in watts based on average core utilization, active cores, operating frequency, and core voltage. Try it → CPU Power Consumption Calculator
CPU Voltage Power Calculator Estimate CPU power draw from core voltage, current, VRM efficiency, and active CPU load. Try it → CPU Voltage Power Calculator
CPU Overclock Stability Calculator Estimate an overclock stability score based on base clock, multiplier, core voltage, cooling quality, and CPU silicon quality. Try it → CPU Overclock Stability Calculator
CPU Overclock Percentage Calculator Calculate CPU overclock percentage based on stock base clock, current overclocked clock, and optional turbo reference. Try it → CPU Overclock Percentage Calculator
CPU Frequency Calculator Estimate CPU core frequency from base clock, clock multiplier, and optional spread spectrum adjustment. Try it → CPU Frequency Calculator
CPU Multiplier Calculator Calculate CPU clock speed from base clock, CPU multiplier, optional turbo ratio, and a load efficiency factor. Try it → CPU Multiplier Calculator
CPU Clock Speed Calculator Estimate the effective CPU clock speed from base clock, multiplier, core ratio adjustment, and turbo boost factor. Try it → CPU Clock Speed Calculator
UPS Size Calculator for PC Estimate the recommended UPS capacity for a PC setup based on computer power draw, monitor power, desired battery runtime, PSU power factor, and safety headroom. Try it → UPS Size Calculator for PC
Laptop Electricity Cost Calculator Estimate how much it costs to run a laptop based on power draw, daily usage, electricity rate, charging efficiency, and number of days used. Try it → Laptop Electricity Cost Calculator
Workstation Power Calculator Estimate the recommended power supply wattage for a workstation based on CPU power, GPU power, number of storage drives, memory modules, and headroom level. Try it → Workstation Power Calculator
Server Electricity Cost Calculator Estimate the electricity cost to run a server based on average power draw, quantity, runtime, power supply efficiency, and local electricity rate. Try it → Server Electricity Cost Calculator
Monitor Electricity Cost Calculator Estimate how much it costs to run a computer monitor based on power draw, daily usage, electricity rate, and the number of monitors. Try it → Monitor Electricity Cost Calculator
Desktop Electricity Cost Calculator Estimate how much it costs to run a desktop computer based on power draw, daily usage, electricity rate, and system load level. Try it → Desktop Electricity Cost Calculator
UPS Runtime Calculator for PC Estimate how long a UPS can power a PC based on battery capacity, UPS efficiency, PC power draw, and battery age. Try it → UPS Runtime Calculator for PC
Battery Backup Runtime Calculator Estimate how long a battery backup system can power connected equipment based on battery voltage, battery capacity, load, inverter efficiency, and recommended depth of discharge. Try it → Battery Backup Runtime Calculator
VA to Watts Calculator for PC Convert apparent power in volt-amperes (VA) to estimated real power in watts for a PC, using power factor and PSU efficiency. Try it → VA to Watts Calculator for PC
PC Carbon Footprint Calculator Estimate the annual carbon footprint of a personal computer based on daily usage, device power draw, electricity grid intensity, and manufacturing emissions amortized over the device lifespan. Try it → PC Carbon Footprint Calculator
Computer Running Cost Calculator Estimate the electricity cost of running a computer based on power draw, daily usage, electricity rate, number of computers, and system type. Try it → Computer Running Cost Calculator
PSU Headroom Calculator Estimate the recommended power supply wattage by adding component power draw and extra headroom for transient spikes, capacitor aging, efficiency, and future upgrades. Try it → PSU Headroom Calculator
Gaming PC Electricity Cost Calculator Estimate how much it costs to run a gaming PC based on average power draw during gaming, gaming hours per day, idle hours per day, local electricity rate, and power supply efficiency. Try it → Gaming PC Electricity Cost Calculator
PC Electricity Cost Calculator Estimate how much it costs to run a desktop PC based on average power draw, daily usage, electricity rate, power supply efficiency, and usage pattern. Try it → PC Electricity Cost Calculator
Computer Power Consumption Calculator Estimate a computer's electricity use and cost based on component power draw, daily usage, operating days, electricity rate, and power supply efficiency. Try it → Computer Power Consumption Calculator
Computer Energy Consumption Calculator Estimate the electricity cost of running a computer based on average power draw, daily usage, electricity rate, and the number of days used per month. Try it → Computer Energy Consumption Calculator
PSU Electricity Cost Calculator Estimate the electricity cost of a computer power supply unit based on average system draw, daily usage, electricity rate, PSU efficiency, and time period. Try it → PSU Electricity Cost Calculator
PSU Power Cost Calculator Estimate the electricity cost of running a computer power supply by factoring in component power draw, PSU efficiency, daily usage, electricity rate, and time period. Try it → PSU Power Cost Calculator
PSU Load Calculator Estimate total system power draw and recommended power supply capacity based on major component loads, planned component count, and headroom for efficiency and future upgrades. Try it → PSU Load Calculator
PSU Efficiency Calculator Estimate a power supply unit's efficiency based on output power, input power, load level, and 80 PLUS certification adjustment. Try it → PSU Efficiency Calculator
Recommended PSU Calculator Estimate the recommended power supply wattage for a desktop PC based on major component power draw, number of storage drives, cooling fans, and intended headroom for stability and future upgrades. Try it → Recommended PSU Calculator
PC Wattage Calculator Estimate the recommended power supply wattage for a desktop PC based on CPU power, GPU power, number of storage drives, number of memory sticks, and planned overclocking headroom. Try it → PC Wattage Calculator
PSU Size Calculator Estimate the recommended power supply wattage for a desktop PC based on CPU power, GPU power, number of drives, cooling fans, and headroom for power spikes, efficiency, and future upgrades. Try it → PSU Size Calculator
PSU Wattage Calculator Estimate the recommended power supply wattage for a desktop PC based on CPU power, GPU power, component count, overclocking, and desired headroom. Try it → PSU Wattage Calculator
Gaming PC Power Supply Calculator Estimate the recommended power supply wattage for a gaming PC based on CPU power draw, GPU power draw, number of storage drives, cooling fans, and desired headroom level. Try it → Gaming PC Power Supply Calculator
PC Power Supply Calculator Estimate the recommended power supply wattage for a desktop PC based on CPU power draw, GPU power draw, number of storage drives, number of memory sticks, cooling fans, and desired headroom for efficiency and future upgrades. Try it → PC Power Supply Calculator
PSU Calculator Estimate the recommended power supply wattage for a desktop PC build based on CPU power, GPU power, component count, overclocking, and desired efficiency headroom. Try it → PSU Calculator
Power Supply Calculator Estimate the recommended power supply wattage for a desktop PC based on CPU power, GPU power, number of drives, cooling fans, and extra headroom for efficiency and future upgrades. Try it → Power Supply Calculator
PC Power Supply Calculator Estimate the recommended power supply wattage for a desktop PC based on major components, cooling, storage, and headroom for peak loads and future upgrades. Try it → PC Power Supply Calculator
PC Wattage Calculator Estimate recommended power supply wattage for a desktop PC based on CPU power, GPU power, number of storage drives, cooling fans, and overclocking level. Try it → PC Wattage Calculator
PC Build Budget Calculator Estimate a realistic PC build budget based on target gaming resolution, CPU/GPU performance tier, memory capacity, storage size, and whether you need a monitor and peripherals. Try it → PC Build Budget Calculator
Gaming Performance Calculator Estimate average gaming performance in FPS based on GPU capability, CPU capability, game resolution, graphics settings, and ray tracing intensity. Try it → Gaming Performance Calculator
Performance Per Dollar Calculator Estimate how much performance value you get for each dollar spent by combining a benchmark score with weighted real-world factors like efficiency, memory capacity, and component age, then dividing by total price. Try it → Performance Per Dollar Calculator
Benchmark Percentage Calculator Calculate the percentage difference between an actual value and a benchmark value, with an optional performance weight and category multiplier to produce an adjusted benchmark percentage. Try it → Benchmark Percentage Calculator
Frame Time to FPS Calculator Convert frame time in milliseconds to frames per second, with optional display of effective FPS based on rendering overhead and dropped frame percentage. Try it → Frame Time to FPS Calculator
FPS to Frame Time Calculator Convert frames per second (FPS) into frame time in milliseconds and adjust the result for display refresh rate alignment, rendering overhead, and synchronization mode to estimate effective per-frame latency. Try it → FPS to Frame Time Calculator
Frame Time Calculator Calculate frame time in milliseconds based on frame rate, or estimate frame rate from a measured frame time. Try it → Frame Time Calculator
1% Low FPS Calculator Estimate 1% low FPS from average FPS and system/game conditions. Try it → 1% Low FPS Calculator
Average FPS Calculator Estimate average frames per second based on GPU performance, CPU performance, game resolution, graphics settings, and ray tracing load. Try it → Average FPS Calculator
FPS Calculator Estimate frames per second (FPS) based on monitor refresh rate, GPU performance, game resolution, graphics quality, and CPU performance. Try it → FPS Calculator
PC Performance Calculator Estimate an overall PC performance score based on CPU, GPU, RAM, storage type, and cooling quality. Try it → PC Performance Calculator
Graphics Card Bottleneck Calculator Estimate the percentage bottleneck between a graphics card and processor for gaming by combining CPU and GPU benchmark strength, target resolution, game CPU intensity, and RAM capacity. Try it → Graphics Card Bottleneck Calculator
Processor Bottleneck Calculator Estimate the processor bottleneck percentage based on CPU single-core performance, CPU core count, GPU performance level, game resolution, and target frame rate. Try it → Processor Bottleneck Calculator
Laptop Bottleneck Calculator Estimate the overall bottleneck percentage in a laptop by comparing CPU and GPU performance balance, available RAM, storage speed, and thermal limits. Try it → Laptop Bottleneck Calculator
Gaming PC Bottleneck Calculator Estimate the overall gaming bottleneck percentage between your CPU and GPU based on their relative performance, target resolution, game CPU intensity, and target frame rate. Try it → Gaming PC Bottleneck Calculator
CPU GPU Bottleneck Calculator Estimate the CPU-to-GPU bottleneck percentage for a gaming or productivity PC build using relative CPU and GPU performance, target resolution, game CPU intensity, and target frame rate. Try it → CPU GPU Bottleneck Calculator
GPU Bottleneck Calculator Estimate the likelihood that your graphics card is the performance bottleneck in a gaming or rendering workload based on CPU performance, GPU performance, resolution, target frame rate, and game CPU intensity. Try it → GPU Bottleneck Calculator
CPU Bottleneck Calculator Estimate the likelihood that your CPU is limiting gaming or workload performance based on CPU utilization, GPU utilization, core/thread capacity, target resolution, and frame rate target. Try it → CPU Bottleneck Calculator
PC Bottleneck Calculator Estimate the bottleneck percentage between a CPU and GPU based on their relative performance, gaming resolution, target frame rate, system RAM, and workload type. Try it → PC Bottleneck Calculator
PC Bottleneck Calculator Estimate the performance bottleneck percentage between a CPU and GPU based on their relative performance scores, target resolution, RAM size, and workload type. Try it → PC Bottleneck Calculator
Gaming PC Cost Per FPS Calculator Estimate how much you are paying per frame per second for a gaming PC build using total system cost, average FPS, resolution, game type, and graphics quality. Try it → Gaming PC Cost Per FPS Calculator
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