watt&home
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Market & tariff

Choose your label market and enter the electricity price from your bill.

For example, 20 cents/kWh is 0.20 USD/kWh. Use your own bill rate.

Read United States guidance

Changing market selects a currency and clears the draft price for you to enter. Currency changes do not convert prices. Your remembered market sets the label reader's starting market; shared examples keep their own inputs. Separate scenario rates stay as entered.

Clearing removes saved market, tariff, scenarios and measurement observations. Export journal records you want to keep first. Analytics choices are managed separately in the footer.

How device storage works

YOUR APPLIANCE. YOUR TARIFF.

Time-of-use and electricity-tariff comparison

Compare two electricity tariffs using the same annual kWh, your off-peak share and separate daily fixed charges, then explore shifting usage.

TWO QUOTES. THE SAME ENERGY.

Compare your tariff options.

Tariff A
Tariff B

Enter rates in pounds, dollars or euros per kWh, and fixed charges in the same currency per day. For a single-rate tariff, use the same peak and off-peak rate. Starting quotes are illustrative.

Annual estimate from the entered quotes
Cost componentTariff ATariff B
Electricity use$364.00$356.20
Fixed charges$182.50$164.25
Total$546.50$520.45

Tariff B costs $26.05 less per year under these assumptions.

A: 1,300 peak / 0 off-peak kWh. B: 910 peak / 390 off-peak kWh.

What if you shift use on tariff B?

Energy stays the same. Check the time window and your routine before assuming you can move this much.

At 50% off-peak, tariff B totals $463.25 per year: $57.20 less than its original split.

How tariff comparison works

Off-peak kWh = annual kWh × off-peak share ÷ 100. Peak kWh = annual kWh − off-peak kWh. Energy cost = peak kWh × peak rate + off-peak kWh × off-peak rate. Fixed cost = daily fixed charge × year days. Total = energy cost + fixed cost.

Use whole-home consumption for a whole-bill comparison. Tiers, demand charges, discounts, export payments, exit fees and other charges are excluded. Use quotes with a consistent tax basis; the tool adds no taxes.