| Period | Consumption (m³) | Supply Rate | Delivery Rate | Fixed Charge | Tax % | Total (estimate) |
|---|---|---|---|---|---|---|
| March 2026 | 1,250 | 180.00 | 35.00 | 2,500.00 | 17 | See calculator result |
| Batch row: Jan 2026 | 980 | Same as inputs | Same as inputs | Same as inputs | Same as inputs | Computed per row |
| Batch row: Feb 2026 | 1,130 | Same as inputs | Same as inputs | Same as inputs | Same as inputs | Computed per row |
Variable Rate = Supply Rate + Delivery Rate + Other Variable Charges
Variable Cost = Consumption × Variable Rate
Subtotal = Fixed Charge + Demand/Capacity Charge + Flat Surcharge + Variable Cost
Discount = Subtotal × (Discount % ÷ 100)
Tax = (Subtotal − Discount) × (Tax % ÷ 100)
Total Cost = (Subtotal − Discount) + Tax
Energy equivalents (kWh, MMBtu) are optional comparisons. For m³ and ft³, they depend on gas quality, so you can edit the conversion fields.
- Select Single Period for one bill, or Batch to total multiple periods.
- Choose the unit that matches your tariff and enter consumption.
- Enter your supply, delivery, and any other variable charges per unit.
- Add fixed, demand/capacity, and surcharge amounts if applicable.
- Set discount and tax percentages to match your bill.
- Optional: add billing days, operating hours, and output quantity for unit economics.
- Press Calculate to view results above the form.
- Use Download CSV or Download PDF from the results box.
1) Which unit should I choose?
Pick the same unit your tariff uses for billing. If your bill shows m³ or ft³, choose that. If it shows therms, kWh, or MMBtu, select the matching energy unit for consistent per-unit rates.
2) What if I only know the total bill amount?
Enter consumption and set rates so the total matches your bill. You can place the whole amount into Fixed Charge as a quick approximation, then refine by splitting into supply and delivery using your tariff details.
3) Are kWh and MMBtu values exact?
They are estimates for comparison. Energy content varies by gas quality and region. Edit “kWh per m³” or “BTU per ft³” to match your supplier statement if you need tighter accuracy.
4) How do I use Batch mode?
Paste one line per period using: Label, Consumption, Output. Rates and charges apply to every line, creating a consistent comparison. It then totals consumption and cost and calculates average cost per unit and per output.
5) How is cost per output calculated?
Cost per output equals Total Cost divided by Output Quantity. Use it for per-ton, per-piece, or per-batch gas cost. If Output Quantity is empty or zero, the calculator shows a dash instead.
6) Can I include rebates or negotiated discounts?
Yes. Use the Discount/Rebate field as a percentage. It reduces the subtotal before tax. If your discount applies after tax, set tax to zero, calculate, then add tax separately.
7) Why might my subtotal not match my utility bill?
Bills can include tiered rates, minimums, late fees, or special riders. Add these as Other Variable Charges or Flat Surcharge. If you have tiered pricing, run separate batch rows per tier and combine results.
8) Is my data stored anywhere?
No database is used. The calculator processes your inputs during the request. Downloads are generated immediately from the same submitted values, then sent to your browser.