# Database Storage Growth Calculator

> Project database size months ahead from today’s size and a fixed GB-per-month or percentage growth rate, and see when it will reach a capacity limit.

Category: Software, cloud & AI · Applies to: Worldwide · Last updated: 2026-10-29
Interactive calculator: https://calculators.geekmidst.com/calculators/database-storage-growth-calculator

Project storage forward with steady growth (a fixed number of GB a month) or compound growth (a percentage a month), and find when it hits your disk or plan limit.

Also called: Storage growth forecast calculator.

## Inputs
- Current size (unit GB; default 200)
- Growth type (options: GB per month, % per month; default linear)
- Growth (default 25)
- Months ahead (unit months; default 12)
- Capacity limit (unit GB; default 1000; optional)

## Results
- Projected size
- Growth over the period
- Projected size in binary units
- Time until the limit is reached

## Formula

```
Linear: Size(m) = Size₀ + G × m;  Compound: Size(m) = Size₀ × (1 + g)^m;  Months to limit = (Limit − Size₀) ÷ G  or  ln(Limit ÷ Size₀) ÷ ln(1 + g)
```

Where:
- Size₀: current size
- G: GB added per month
- g: monthly growth rate as a decimal
- m: months ahead

## Worked example
1. Size in 12 months: 200 + 25 × 12 = 500 GB.
2. Room left: 1,000 − 200 = 800 GB.
3. Months to fill: 800 ÷ 25 = 32 months.

**Result:** Growing 25 GB a month from 200 GB, the database reaches 500 GB in a year and a 1,000 GB limit in 32 months.

## What the result means

Plan to act well before the limit: many databases slow down or need maintenance headroom before a disk is full, so treat 70–80% of capacity as the practical ceiling.

## Assumptions and limits
- Growth continues at the entered rate for the whole period.
- Indexes, write-ahead logs, replicas, backups and fragmentation can make disk use larger than the data size. Measure the total on disk if you can.

## Questions

### Should I use linear or percentage growth?

Use GB per month when you add a steady amount of data (logs, orders). Use a percentage when growth tracks a user base that is itself growing.

### Why are there two sizes?

Disk vendors use decimal GB (10⁹ bytes); many operating systems and databases report binary GiB (2³⁰ bytes), which is about 7% larger per unit.

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Source: GM¹X CalcVerse — https://calculators.geekmidst.com/calculators/database-storage-growth-calculator