aws-cost-calculator-cli 1.2.0

AWS Cost Calculator CLI - Calculate daily and annual AWS costs across multiple accounts

AWS Cost Calculator (cc)

A CLI tool to quickly calculate AWS costs across multiple accounts.

Installation

cd ~/cost-calculator
pip install -e .

Quick Start

1. Login to AWS SSO

aws sso login --profile my_aws_profile

Note: You need to do this before running cost calculations. The SSO session typically lasts 8-12 hours.

2. Initialize a profile

cc init --profile myprofile \
  --aws-profile my_aws_profile \
  --accounts "123456789012,234567890123,345678901234"

3. Calculate costs

# Default: Today minus 2 days, going back 30 days
cc calculate --profile myprofile

# Specific start date
cc calculate --profile myprofile --start-date 2025-11-04

# Custom offset and window
cc calculate --profile myprofile --offset 2 --window 30

# JSON output
cc calculate --profile myprofile --json-output

4. Analyze cost trends

# Analyze last 3 weeks (default)
cc trends --profile myprofile

# Analyze more weeks
cc trends --profile myprofile --weeks 5

# Custom output file
cc trends --profile myprofile --output weekly_trends.md

# JSON output
cc trends --profile myprofile --json-output

5. List profiles

cc list-profiles

How It Works

Date Calculation

• Start Date: Defaults to today, or specify with --start-date
• Offset: Days to go back from start date (default: 2)
• Window: Number of days to analyze (default: 30)

Example: If today is Nov 4, 2025:

• With offset=2, window=30: Analyzes Oct 3 - Nov 2 (30 days)

Cost Calculation

1. Operational Costs: Sum of daily costs ÷ window days
2. Support Allocation:
   • Gets support cost from the analysis month
   • Divides by 2 (50% allocation)
   • Divides by days in that month
3. Daily Rate: Operational + Support per day
4. Annual Projection: Daily rate × 365

Filters Applied

• Billing Entity: AWS only (excludes marketplace)
• Excluded: Tax, Support (calculated separately)
• Metric: Net Amortized Cost

Configuration

Profiles are stored in: ~/.config/cost-calculator/profiles.json

Example:

{
  "myprofile": {
    "aws_profile": "my_aws_profile",
    "accounts": ["123456789012", "234567890123", "345678901234"]
  }
}

Examples

# Quick daily check
cc calculate --profile myprofile

# Historical analysis
cc calculate --profile myprofile --start-date 2025-10-01

# Export to JSON for processing
cc calculate --profile myprofile --json-output > costs.json

# Different window size
cc calculate --profile myprofile --window 60

# Weekly cost trends analysis
cc trends --profile myprofile

# Analyze last 8 weeks
cc trends --profile myprofile --weeks 8

# Monthly cost trends analysis
cc monthly --profile myprofile

# Analyze last 12 months
cc monthly --profile myprofile --months 12

Trends Report

The trends command generates a markdown report with two types of analysis:

1. Week-over-Week (WoW)

Compares each week to the previous week - good for catching immediate spikes and changes.

2. Trailing 30-Day (T-30)

Compares each week to the same week 4 weeks ago - filters out noise and shows sustained trends.

Features:

• Service-level aggregation: Shows total cost per service (not individual usage types)
• Top 10 Increases/Decreases: For each comparison period
• Total rows: Sum of top 10 changes for quick assessment
• Filters: Only shows changes >$10 and >5%

Example output:

Week of Oct 19 → Week of Oct 26 (WoW)
  Increases: 4, Decreases: 10
  Top: EC2 - Other (+$949.12)

Week of Oct 26 vs Week of Sep 28 (T-30)
  Increases: 10, Decreases: 10
  Top: EC2 - Other (+$886.39)

The report is saved to cost_trends.md by default and includes:

• Service name
• Previous/baseline cost
• Current cost
• Change amount and percentage
• Total of top 10 changes

Monthly Report

The monthly command generates month-over-month cost comparisons:

Features:

• Service-level aggregation: Shows total cost per service
• Calendar month comparisons: October vs September, September vs August, etc.
• Top 10 Increases/Decreases: For each month comparison
• Total rows: Sum of top 10 changes
• Filters: Only shows changes >$50 and >5%

Example output:

October 2025 → November 2025
  Increases: 1, Decreases: 10
  Top: Savings Plans for AWS Compute usage (+$231,161.46)

The report is saved to monthly_trends.md by default.

Output

Analyzing: 2025-10-03 to 2025-11-02 (30 days)
AWS Profile: my_aws_profile
Accounts: 3

Fetching cost data...
Fetching support costs...
============================================================
Period: 2025-10-03 to 2025-11-02
Days analyzed: 30
============================================================
Total operational cost: $450,000.00
Daily operational: $14,516.13
Support (month): $15,000.00
Support per day (÷2÷days): $241.94
============================================================
DAILY RATE: $14,758.07
ANNUAL PROJECTION: $5,386,695
============================================================