THE NUMBERS, EXPLAINED
How to use this calculator.
Weights are supplied policy inputs and may represent floor area or another agreed basis. No tariff or tenancy-law determination.
Start with your inputs
Enter tenant submeter use (kwh), shared unmetered use (kwh), shared-load allocation weights, energy price (currency/kwh), fixed bill charge (currency). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Tenant submeter use (kWh) | 100,200 |
| Shared unmetered use (kWh) | 100 |
| Shared-load allocation weights | 1,3 |
| Energy price (currency/kWh) | 0.2 |
| Fixed bill charge (currency) | 20 |
A worked example
With the example inputs above, shared energy allocated by tenant (kwh) is 25, 75. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Shared energy allocated by tenant (kWh) | 25, 75 |
| Tenant charges (currency) | 30, 70 |
| Reconciled total utility charge (currency) | 100 |
How this is calculated
Shared energy allocated by tenant (kWh)
Allocate shared energy in proportion to supplied weights.
Tenant charges (currency)
Charge metered use and allocate shared energy plus fixed charges by weight.
Reconciled total utility charge (currency)
Add all measured and shared use at the unit price plus fixed bill charge.
Symbols and units
- a
- Tenant submeter use (kWh)
- b
- Shared unmetered use (kWh)
- c
- Shared-load allocation weights
- d
- Energy price (currency/kWh)
- e
- Fixed bill charge (currency)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Weights are supplied policy inputs and may represent floor area or another agreed basis. No tariff or tenancy-law determination.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Shared energy allocated by tenant (kWh); Tenant charges (currency); Reconciled total utility charge (currency). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Weights are supplied policy inputs and may represent floor area or another agreed basis. No tariff or tenancy-law determination.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax: Describe and Identify Cost Drivers ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →