South Carolina utility bill calculator

Six bills, one number

Utilities are not one cost. They are half a dozen separate arrangements with separate suppliers, separate billing cycles and completely different behaviour, and the only thing they have in common is that they arrive whether or not you thought about them.

This tool adds the six that most households actually pay and then does three things with the total: shows it monthly and annually, divides it by the number of people, and shows each line as a share of the whole. The share column is the useful one, because effort spent on a line worth 6% of the total is effort mostly wasted.

Two of the six behave quite differently from the rest. Electricity and gas are consumption-driven and seasonal: you change them by using less, and they change on their own between January and June. Internet and mobile are contractual: usage barely matters, and you change them by renegotiating or leaving. Water, sewer and trash sit in between, with a fixed service component and a usage component that most households cannot move much.

A worked example at the default figures

The tool opens on $165 for electricity, $70 for gas or heating, $55 for water and sewer, $28 for trash and recycling, $70 for internet, $90 for mobile, and three people in the household.

That totals $478 a month and $5,736 a year, which is about $159 a month per person. The largest single line is electricity.

The shares are rounded to whole percentages, so they do not add to exactly 100. The electricity default is not arbitrary either: $165 is what the electricity cost calculator produces from its own defaults of 900 kWh at 17 cents plus a $12 customer charge, so the two tools agree with each other by construction.

Look at the ordering rather than the amounts. Electricity and mobile together are more than half the bill. Trash, which is the line people most often complain about, is 6%, and eliminating it entirely would save less than a 20% cut in the electricity bill.

Why is the per-person figure lower than you expect?

Because utilities do not scale with headcount the way groceries do.

A house has one water heater, one furnace, one internet connection and one refrigerator whether two people or five live in it. Water and laundry scale roughly with people. Heating, cooling, lighting and connectivity scale with the building. Mobile scales with lines, not with people, and a family plan does not cost five times a single one.

That is why the per-person number in the results is a comparison tool rather than a budgeting one. It is genuinely useful when housemates are splitting a bill or when you are comparing two households of different sizes. It is misleading if you use it to predict what happens when someone moves in or out: adding a fourth person to the default household does not add $159 a month, and losing one does not save it.

What a twelve-month average is for

The single most common way to get this wrong is to fill the fields in from the bills currently on the table.

Electricity peaks in summer wherever cooling is electric, and gas or heating oil peaks in winter almost everywhere. In a cold-climate household the heating line can be near zero in July and several hundred dollars in January. A February snapshot annualised produces a heating estimate that is far too high; an August one produces a total that is far too low and an electricity line that is too high.

Every utility account holds usage and billing history online. Pull twelve months, add them, divide by twelve, and put that in the field. It takes about ten minutes for all six accounts and it is the difference between a budget that works in April and one that fails in January.

Budget billing, sometimes called levelised or equal payment billing, is worth understanding here because it looks like it solves this problem and does not. It smooths what you pay, not what you use. The utility estimates your annual consumption, divides by twelve, and trues up periodically, either by adjusting the monthly figure or by settling the difference at the end of the plan year. It is a genuinely useful cash-flow tool. It is not a discount, and the annual total is still the honest number to budget against. A household on budget billing should enter the levelised amount only if they also know it is currently tracking the true annual cost rather than accumulating a settlement.

What promotional pricing does to this number

Internet and mobile are the two lines where the price you pay today is frequently not the price of the service.

A promotional internet rate ends, usually after twelve or twenty-four months, and the standard rate can be substantially higher. Equipment rental, broadcast and regional sports surcharges, and installation amortisation may sit outside the advertised price. Mobile plans discount per-line pricing at higher line counts and often bundle device instalments into what looks like a service charge, so the bill falls when the handset is paid off and rises when a new one is financed.

Before you treat this total as your ongoing cost, check what each of those two lines becomes at the end of the current term. If the internet promotion has six months left, budget the post-promotion price, not the current one. That single correction is worth more than most of the small economies people attempt on the other four lines.

• Check the contract end date on both internet and mobile.
• Separate device instalments from service charges on the mobile bill.
• Count equipment rental as part of the internet line, since it is unavoidable unless you buy your own.
• Recheck annually. These are the two lines where doing nothing reliably costs money.

Common mistakes with a utility budget

• Using the current month. Seasonal swing makes any single month a poor guide, in a direction that depends entirely on when you happen to be reading this.
• Trusting budget billing as the true cost. It smooths payments, not consumption, and a settlement can be waiting at the end of the plan year.
• Budgeting the promotional price. Internet and mobile promotions end, and the standard rate is the number that will actually be charged for most of the time you live there.
• Ignoring what a landlord or an association covers. In some rentals water, sewer and trash are included; in some associations they are covered by the dues. Entering them twice, or forgetting they will appear separately after a move, is a common error when comparing two homes.
• Sizing effort by annoyance rather than by share. Trash is 6% of the default total. Electricity is 35%.
• Forgetting the connection fees on a move. New service, deposits and installation charges are one-off costs that no monthly figure includes.

What this calculator does not include

• Streaming, cloud storage, alarm monitoring and other subscriptions. They behave like utilities but they are not, and mixing them in makes the six lines harder to compare against a lease or a listing.
• Propane or heating oil deliveries. Both are bought in large irregular amounts rather than billed monthly, so a twelve-month average is essential before entering them in the gas field.
• Seasonality. Twelve identical months, again.
• Any local rate published by us. Water, sewer and trash are set by municipalities and vary street to street. We publish no rates for them, so every figure here is yours rather than ours.
• Usage forecasting. The tool prices what you type. It does not model an electric vehicle, a new baby, a heat pump or a home office arriving.
• One-off charges. Deposits, reconnection fees, late fees and repair charges.

Where we hold no published data, we ask for your number rather than substituting an average. That is deliberate and is described in our methodology.

What should you check before trusting the total?

• Pull twelve months of history from each of the six accounts
• Divide each annual total by twelve and enter that, not the current bill
• Confirm whether water, sewer or trash is included in rent or association dues
• Find the end date and the standard rate for any internet or mobile promotion
• Separate device instalments from service charges on the mobile line
• Recheck the largest line first, since it is where the money is

Once the annual figure is right, it is an input rather than an answer. Put it into the cost of living calculator alongside housing, food and transport, and use the state pages when you are comparing two places rather than two tariffs. A household considering a move should expect the utility total to change more than almost any line except housing, because climate, building stock and local rates all change at once. The wider picture sits in our cost of living guides.

This page is budgeting arithmetic on your own figures. It is not advice about any supplier, tariff or contract. See the disclaimer.