Heating Degree Days Calculator
Calculate heating degree days for energy use.
About Heating Degree Days Calculator
Energy for Heating Degree Days converts power and running time into kilowatt-hours, then prices it at the local rate to give daily and monthly running costs. Power alone does not tell you the bill - running time and the rate per kWh do.
Formula
Heating Degree Days
Energy (kWh) = watts x hours / 1000; cost = kWh x rate
- kWh
- Kilowatt-hours, the billing unit for electricity
Worked example
With the default values below, Heating Degree Days Calculator returns Cost per Day of $0.75. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Powerminimum 0 W
- 1,000 W
- Hours per dayminimum 0 h
- 5 h
- Rate per kWhminimum 0
- 0.15
Results
- Cost per Day
- $0.75
- Energy per Day
- 5.00 kWh
- Cost per Month
- $22.83
Step by step
- 1Values used
- 2Heating Degree Days
- 3Cost per Day= 0.75
- 4Energy per Day= 5.00 kWh
- 5Cost per Month= 22.83
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Heating Degree Days calculated?
Energy (kWh) = watts x hours / 1000; cost = kWh x rate Energy for Heating Degree Days converts power and running time into kilowatt-hours, then prices it at the local rate to give daily and monthly running costs.
Why does Heating Degree Days matter?
Power alone does not tell you the bill - running time and the rate per kWh do.
What values do I need to enter?
This calculator takes 3 inputs: Power, Hours per day, Rate per kWh. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.