Utilities calculator - see how much your consumption really costs
Domopay calculates the cost of every utility based on your meter readings and the current tariff. Water, gas, single- and dual-rate electricity, heating - all to the cent, with no Excel sheets or risk of a math error.
How the Domopay utilities calculator works
The Domopay utilities calculator works on a simple principle: you enter two meter readings - a starting one (say, from an old invoice) and an ending one (from today) - and pick your utility provider and current tariff from the built-in database. Domopay automatically works out the consumption (the difference between the readings, in m³, kWh, or liters), multiplies it by the net rate, and adds the mandatory VAT (23% in most cases), the monthly subscription fee, the distribution charge, the transmission fee, and any other fixed charges - exactly the way gas suppliers, water utilities, and electricity providers calculate their own invoices. The result shows the full gross cost for the period. On top of that, you get a visual breakdown: how much of the total is the variable portion (usage-based), how much is the fixed portion (subscription and fees), and what share is tax. You can compare the result against your actual invoice line by line, and even see how your usage stacks up against previous months and the average for similar households in your municipality.
What you can calculate
The Domopay calculator supports every common utility found in a Polish home or flat, regardless of who supplies it. For water: cold water (m³), hot water (m³), and sewage (usually billed 1:1 against cold-water consumption, though sometimes calculated separately). For gas: natural gas (converted from m³ to kWh) along with distribution and transmission fees - covering tariffs like W-1 and W-2 (standard usage), W-3 (air conditioning), W-4 (gas heating), and other variants used by PGNiG, Orlen Gaz, and other suppliers. For electricity: G11 (single-rate), G12 (two zones - day and night at different rates), G12w (weekends treated as the night rate), and the rarer three-zone G13. For heating: a heat meter measured in GJ (gigajoules). And for waste: the municipal fee, charged per person at your local rate. You can bring all of these utilities together into a single report.
Why manual calculation isn't worth it
Calculating utility costs by hand is a minefield of small errors, and every one of them costs money. Here are the most common traps that catch people out: an outdated VAT rate, since rates change and a spreadsheet doesn't update itself; a skipped or mis-entered subscription fee, since every supplier charges a different flat amount for the service itself; a wrong m³-to-kWh conversion for gas - in Poland gas is billed in kWh (roughly 1 m³ ≈ 10.55 kWh), and plenty of people calculate in m³ instead, throwing the whole result off; forgetting the night-rate zone on a G12 electricity tariff, where day usage and night usage each need to be multiplied by their own rate separately; mixing up the billing year, since some settlements run January to December and others April to March; and missing a mid-period tariff change altogether. Any one of these mistakes can over- or under-state a bill by 50 to 300 złoty a month. Domopay updates rates automatically and handles every one of these cases for you.
Calculator for managers vs residents
A resident or tenant uses the calculator for a distinctly different purpose than a property manager. A resident mainly wants to check how much they'll actually owe for electricity, water, gas, or heating in a given month and compare that figure against the supplier's invoice - a quick way to catch errors or overcharges, like an inflated rate or a misread meter. They can also compare tariff options - switching from G12w to G11, for example - and see exactly how much they'd really save. A property manager or housing-association administrator uses the calculator in an entirely different context - calculating utility usage at the scale of an entire building. That means things like common-area water consumption (courtyard, stairwells, cleaning), splitting a shared gas meter's cost across individual flats, working out surcharges or refunds owed to each unit, and generating the annual utility settlement for the whole housing community. A manager has to be especially precise here, because every resident will scrutinize every złoty of the final settlement.
Common questions about the utilities calculator
Yes - Domopay separates the cost into the variable part (consumption × rate) and the fixed part (subscription fee, distribution and transmission fees), exactly as it appears on the provider's invoice. The result can be compared 1:1 with the bill.
Water rates come from tariffs approved by Wody Polskie and published by local waterworks. Gas, electricity, and heating rates are updated from URE-approved tariffs and individual seller price lists.
G12 has two rates: day and night. You enter consumption from each zone separately and the calculator multiplies it by the right rate and sums the result. Domopay also handles G12w variants where weekends are treated as the night zone.
Yes - pick any range (month, quarter, calendar year, billing year) and Domopay sums consumption and cost from all readings within that range. Export the result to PDF as an annual summary.
Calculate utilities once - Domopay handles the rest
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