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Tiered Utility Rate Calculator

Enter usage, tier caps, and rates to compute the tiered utility bill.

How it is calculated

Usage is poured into three bands in order. tier 1 = min(usage, cap1), tier 2 = min(what is left, cap2 − cap1), and tier 3 = everything above cap2. Each band is multiplied by its own rate and the three charges are added: usage charge = t1 × rate1 + t2 × rate2 + t3 × rate3. Then total bill = usage charge + fixed fee, and effective rate = total bill ÷ usage. Important detail: the second cap is a cumulative upper limit counted from zero, not the width of tier 2, so with caps 300 and 600 the second band is 300 units wide. The fixed fee is optional and defaults to 0, but all five tier fields and the usage are required. Amounts are shown in dollars with two decimals, so the effective rate is rounded to the cent.

Worked example

Usage 750 units, tier 1 up to 300 at 0.12, tier 2 up to 600 at 0.18, tier 3 above that at 0.25, fixed fee 9.50. Tier 1: 300 × 0.12 = 36.00. Tier 2: (600 − 300) = 300 units × 0.18 = 54.00. Tier 3: 750 − 600 = 150 units × 0.25 = 37.50. Usage charge: 36.00 + 54.00 + 37.50 = $127.50. Adding the fixed fee gives a total bill of $137.00. The effective rate is 137 ÷ 750, which displays as $0.18 per unit.

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Common mistakes

  • Entering the width of tier 2 as its cap. If tier 1 ends at 300 and tier 2 is 300 units wide, the second cap is 600, not 300. A second cap of 300 would leave tier 2 empty.
  • Applying the rate of the tier you land in to all your usage. Only the units above a threshold pay the higher rate.
  • Mixing units, such as a rate quoted per kWh with tier limits written in MWh, or water rates per cubic metre with usage in litres.
  • Forgetting that the effective rate includes the fixed fee, so it will be higher than any single tier rate on a low-usage bill.
  • Typing the tier 3 rate as a percentage increase instead of an actual price per unit, or leaving it blank, which gives no result.

Sources

About this calculator

Under tiered (block) pricing, usage is split into successive bands — for example 0–300 kWh at one rate, 301–600 kWh at a higher rate, and anything above that at a higher rate still — and each portion of consumption is billed at its own tier's price before being summed together, plus any fixed monthly fee. The total bill is therefore not simply usage × one rate, but the sum of each tier's (usage in that tier) × (that tier's rate).

Utility customers checking a bill, and analysts modeling how a progressive electricity or water tariff scales with consumption, use this calculation to see exactly how much of their usage falls into each pricing band and how a change in consumption would shift the total cost — a structure many utilities use to encourage conservation by charging heavier users a higher marginal rate.

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  • Editorial team

    Check the caps against your tariff first, because the second cap counts from zero, not from the end of tier 1. With caps of 100 and 300, tier 2 covers units 101 to 300. Using the sample rates, 500 units costs 90.00 in usage plus 10 fixed, 100.00 in all, an effective 0.20 per unit, while 250 units comes to 42.50. Which tier structure does your own bill use, and does it vary by season?

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