Calculate a utility charge from meter readings

What to paste into the tool

Task: Calculate a utility usage charge using only the figures below. Show: the reading difference in the stated units, the usage charge (difference times the stated rate per unit), any supplied fixed charge for the stated period, and the total. If closing is below opening, do not infer rollover, replacement or reset; mark usage/charges 'not stated' pending supplied rules. Missing fixed charge is 'not stated', not zero. Show every arithmetic step. First verify the supplied tariff uses the same meter units and applies to the reading period. If units, period, tier rules or fixed-charge treatment do not match or are unclear, do not force a simple multiplication or prorate: mark the affected charge/total 'not stated' and list the missing rule. Apply only the rounding rule written below; if none is supplied, mark the rounding 'not stated' and show unrounded figures. Do not add taxes, discounts, conversions or any figure not supplied; write 'not stated' for anything missing. Do not comment on whether the tariff is a good choice. Inputs: [paste opening and closing readings with dates and the meter's unit] [paste the stated rate per unit and any fixed charge with its period] [paste the rounding rule as written, or not stated]. Task: Re-do the whole calculation with Python and compare the draft sheet with the figures note pasted below it. Recalculate the reading difference, the usage charge, any fixed charge and the total, using only the rounding rule written in the note. Compare every figure and step in the draft with your recalculation and list every mismatch. Then return the corrected full sheet with every step shown. Keep the rules: closing below opening means usage and the affected charges are not calculated without a supplied reset or rollover rule; a missing fixed charge is not zero; no taxes, discounts, conversions or figures that are not in the note; missing figures stay marked as not supplied. Draft sheet: [paste the draft sheet]. Figures note: [paste the same figures note].

What to paste into the tool

Type each problem into the smart calculator, one at a time, and read the solution for each: 1. Closing reading minus opening reading. 2. The difference times the rate per unit. 3. The usage charge plus any supplied fixed charge, for the total. Write the unit next to each figure yourself. If closing is below opening, stop: mark usage and the affected charges 'not stated' in your own note and check the tariff document yourself for any rollover, replacement or reset rule. The tool does arithmetic only: apply the rounding rule yourself exactly as written (if none is written, mark rounding 'not stated' and keep unrounded figures), treat a missing fixed charge as 'not stated' (not zero), and check unit, tariff period and any tier or fixed-charge allocation questions yourself against the tariff document. Do not type in account numbers, names or addresses.

What to paste into the tool

Task: Work out my utility charge from the figures note below, step by step. Use Python to calculate the reading difference, usage charge, fixed charge and total, using only the rounding rule written in the note. Show each step with its figures. Flag negative differences without a supplied reset or rollover rule, missing fixed charges (not zero), unit or period mismatches, and missing tier or fixed-charge allocation rules instead of assuming a simple rate applies. Do not add figures that are not in the note. If a needed figure is missing, say which one and stop. Figures note: [paste the figures note].

What to paste into the tool

Task: Work out my utility charge from the figures note below, step by step. Use Python to calculate the reading difference, usage charge, fixed charge and total, using only the rounding rule written in the note. Show each step with its figures. Flag negative differences without a supplied reset or rollover rule, missing fixed charges (not zero), unit or period mismatches, and missing tier or fixed-charge allocation rules instead of assuming a simple rate applies. Do not add figures that are not in the note. If a needed figure is missing, say which one and stop. Figures note: [paste the figures note].