Natural Gas Bill Calculator

Calculate monthly natural gas bill from therms used and rate.

By Konstantin Iakovlev · Updated April 2026 · Source: DOE

$
$

Monthly Bill

$12.00

Annual Cost

$144.00

Breakdown

Usage Cost$0.00
Service Charge$12.00
Monthly Total$12.00
Annual Total$144.00
Equivalent Electric Cost$0.00

Use the Natural Gas Bill Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Estimating a monthly natural gas bill comes down to how much energy your home burns and what your utility charges for it. That math matters for budgeting and for spotting where you might trim usage, particularly heading into 2026, when residential gas prices in many regions are expected to run roughly 3-5% higher than in 2025 as supply chains adjust and demand keeps climbing.

The underlying formula is simple: Total Bill = (Therms Used * Rate per Therm) + Fixed Monthly Charges. A therm reflects the energy content of the gas your meter records as you consume it. The rate per therm is what your utility bills for each one, and it is often tiered or tied to market swings. Fixed monthly charges sit on top regardless of usage, covering administrative and infrastructure costs.

People routinely leave the fixed monthly charges out of their estimate, and that omission can throw off the total considerably. Tiered pricing is another wrinkle: cross a certain usage threshold and your per-therm rate may jump. For the most accurate picture, pull your latest bill or check your provider's website for current rates and any surcharges that apply to your account.

Example: Estimating Your January 2026 Natural Gas Bill

  1. 1 Input: Let's assume you used 85 therms in January 2026. Your utility charges $1.45 per therm and has a fixed monthly charge of $18.50.
  2. 2 Calculation: Multiply therms used by the rate per therm: 85 therms * $1.45/therm = $123.25. Then, add the fixed monthly charge: $123.25 + $18.50 = $141.75.
  3. 3 Result: Your estimated natural gas bill for January 2026 would be $141.75.
  4. 4 Context: This example provides a clear estimate. Remember to factor in any potential energy efficiency upgrades or seasonal usage changes to refine your future predictions and manage your energy budget effectively.

Source: DOE · Last updated: April 2026

Frequently Asked Questions

What is the average natural gas bill per month?
The average US household pays $60-$80 per month for natural gas, with significant seasonal variation. Winter bills with gas heating can reach $150-$250, while summer bills for water heating and cooking only may be $20-$40.
How much does natural gas cost per therm?
Natural gas rates average $1.00-$1.50 per therm nationally, but range from $0.60 in low-cost states to $2.50+ in expensive markets. Your bill also includes a base delivery charge ($10-$25/month) plus distribution costs, so the effective per-therm cost is higher than the commodity rate alone.
How many therms does a gas furnace use per month?
A gas furnace in moderate winter conditions uses 50-100 therms per month. In severe cold, usage can reach 150-200+ therms. A high-efficiency furnace (95%+ AFUE) uses 15-25% less gas than a standard 80% AFUE furnace for the same heating output.

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