Where utility calculations go wrong
Calculating utility bills looks trivial: take the meter reading, subtract last month's, multiply by the tariff. Yet the same mistakes repeat in almost every household:
- Wrong difference — last month's reading is taken from memory or a note that no longer matches what was submitted to the provider;
- Outdated tariff — the price changed, the spreadsheet didn't;
- Misread digits — the red fractional digits get included, or a digit is simply miscopied from the meter;
- Lost history — when readings live in random notes, you cannot prove or analyze anything a year later.
Each mistake is small, but they compound into overpayments, disputes with providers and zero understanding of your actual consumption.
A workflow that removes the human from the math
The fix follows the same principle asautomatic expense tracking: stop typing, start capturing. In FinMan the monthly routine looks like this:
- Take a photo of the meter and send it to the Telegram or WhatsApp bot.
- AI reads the digits — correctly handling the fractional part — and recognizes which utility service the meter belongs to.
- The reading is recorded against your address; the app calculates the difference from the previous reading, applies the current tariff and shows the amount to pay.
Multiple addresses, multiple services, shared meters with different tariff steps — all handled by the same flow. The full history stays attached to the address, so a year of consumption is one chart, not a search through pockets and notebooks.
For landlords: the tenant does it for you
If you rent out a property, the monthly "please send me the meter readings" exchange disappears entirely. FinMan generates an invite link for the address: the tenant registers and sends meter photos directly — via the web app or the bot. You see every reading, the math is consistent, and the history is shared and undisputed.