Leave a high-usage tier
The most expensive usage is removed first, lowering the average rate.
Free 2026/27 tariff calculator
Online water and electricity bill calculator
Calculate a bill by tariff, usage tier, account type and billing period, then see how much a 30% consumption cut could save.
Open the full calculator↓Complete water and electricity calculator
Switch between water, electricity and account-type tabs to access every input, detail, table and chart.
All formulas, coefficients, settings and exports are transferred directly from the supplied 2026/27 tariff reference file.
The result uses the information and settings you provide. Previous balances and utility-specific adjustments may change the issued bill.
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Why can a 30% usage cut reduce the bill by more?
Reduce linked charges
Usage-linked tax, sewer and duty items fall with the base charge.
Smart measurement
Online monitoring and leak detection make the reduction target measurable.
How are water and electricity bills calculated?
A utility bill is not always consumption multiplied by one fixed rate. Account type, billing period, usage tiers and linked charges can affect the total.
Enter billing-period data
Choose the utility and account type, then enter the period and metered consumption.
Apply tariff and usage tiers
The tool places usage into the selected tiers and coefficients and shows the bill components.
Compare a reduction scenario
Compare current and reduced usage to see the effect of leaving a higher-cost tier.
What is a tiered utility tariff?
Under a tiered tariff, consumption is not necessarily billed at one fixed rate. Later portions can enter more expensive tiers, so reducing the highest portion may lower the bill by more than the usage percentage alone.
Main utility bill versus individual unit bills
This calculator estimates the main bill. In a shared-meter building, fair allocation requires unit submeters and monitoring and billing software.
For building managers
How should a shared building bill be divided?
Equal or occupancy-based division does not reflect actual usage. Smart submeters record every unit and Bruntab applies the building's allocation rules and common-area usage.
| Method | Accuracy | Manual reading | Unit bill |
|---|---|---|---|
| Equal split | Low | — | Estimated |
| By occupancy | Medium | — | Estimated |
| Manual submeter | Good | Yes | Semi-automatic |
| Bruntab smart system | Metered usage | No | Automatic |
Bill calculator FAQs
What does the Bruntab calculator cover?
It calculates bills from the supplied account type, period, usage tiers and selectable coefficients, then compares reduced consumption.
Will the result exactly match an issued bill?
Utility-specific adjustments and previous balances may create a difference, so the result is intended for calculation and comparison.
Does it calculate each apartment's share?
This page calculates the main bill. Individual shares require unit submeters and allocation of the main bill and common-area consumption.
Why can a usage cut reduce the bill by a larger percentage?
Because the last portion of usage can be billed in a more expensive tier, and reducing it can also lower linked charges.
