green calculator

Carbon Tax Impact Calculator

Convert household fuel and electricity into tonnes of CO2e, price them at any carbon rate, and net off a dividend.

Convert each fuel to tonnes using its emission factor — gasoline 8.887 kg per gallon, natural gas 5.302 kg per therm, electricity at your grid intensity — then multiply by the rate. A three-person household at 12.71 tonnes pays $826 a year at $65 per tonne, which adds 57.8 cents per gallon of gasoline. With a per-person dividend, a household emitting less than the break-even tonnage finishes ahead.

Quick actions: Save inputs, view saved runs, print, share, or export results

Saved Runs

Inputs

Carbon Tax Rate$/tonne

Dividend Per Person$/year

Gasolinegal/yr

Natural Gastherms/yr

ElectricitykWh/yr

Grid Intensitykg CO2/kWh

Heating Oilgal/yr

Air Travelmiles/yr

Household Sizepeople

Household Income$

Share of the Price Reaching Households%

Results

Annual Carbon Tax

$826.02

Per Month$68.84

Total Emissions12.71 tonnes CO2e

Per Person4.24 tonnes

Gasoline4.62 t — $300.38

Natural Gas3.39 t — $220.56

Electricity3.90 t — $253.21

Heating Oil0.00 t — $0.00

Flights0.80 t — $51.87

Dividend Received$0.00

Net Position$826.02 out of pocket

Net Per Month$68.84

Share of Income1.06%

Break-Even EmissionsNo dividend entered

Break-Even Tax RateNo dividend entered

Added to Gasoline57.77¢ per gallon

Added to Natural Gas34.46¢ per therm

Added to Electricity2.412¢ per kWh

Tip

Worth keeping when a carbon price is in the news: the household effect depends far more on the dividend design than on the rate itself.

Formula

Carbon tax formulas and emission factors

Tonnes CO2e = annual consumption x emission factor / 1000
  Gasoline     8.887 kg per gallon
  Diesel      10.18  kg per gallon
  Natural gas  5.302 kg per therm
  Heating oil 10.16  kg per gallon
  Air travel   0.19  kg per passenger mile
  Electricity  grid intensity kg per kWh (your input)

Annual tax = total tonnes x rate per tonne x pass-through
Dividend = per-person payment x household size
Net cost = annual tax - dividend

Break-even tonnes = dividend / (rate x pass-through)
Cents per gallon = 8.887 / 1000 x rate x pass-through x 100

The tax scales with your emissions; a flat per-person dividend does not. That asymmetry is what decides whether a household gains or loses under a revenue-neutral scheme, and it is why the same rate can leave a low-emitting household ahead and a high-emitting one substantially out of pocket. Grid intensity is left as an input because it ranges from under 0.05 to over 0.7 kg per kWh between regions — a tenfold swing that dominates the electricity line.

Step by step

How the calculation works

1Reconstruct annual consumption from bills and mileage. Gasoline gallons are annual miles divided by miles per gallon; therms and kWh come off twelve months of utility statements; air miles are round-trip distances added up.
2Grid intensity is the input most worth getting right. Your utility publishes it and regional grid data is public. Using a national average when your grid is unusually clean or dirty will produce a badly wrong electricity figure.
3The dividend is what decides most households. Set it to the per-person payment a scheme proposes, and the calculator reports the emissions level at which you break even — below it you gain, above it you pay.
4Pass-through models coverage. Real schemes tax some fuels and not others and apply upstream at different points, so setting it below 100% approximates a scheme where only part of the price reaches household consumption.
5The result covers direct fuel and electricity only. A carbon price also raises the cost of goods with embodied emissions, typically adding 30% to 60% on top. The [carbon footprint calculator](/calculators/carbon-footprint-calculator) covers the wider emissions picture.

Related guides

Learn more about this calculation

Guide

Carbon Footprint Reduction Guide: Measure, Prioritize, and Cut Emissions

Learn how the DTC carbon footprint calculator estimates annual emissions from electricity, gas, driving, flights, and waste, then use the result to prioritize realistic reductions.

Guide

Understanding Calculator Formulas: How DTC Turns Inputs into Results

Understand how Do The Calculation formulas are presented, what the explanation blocks mean, and how to verify calculator logic before using a result in a real decision.

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Carbon Footprint Calculator

Household emissions across a wider set of categories than the taxed fuels alone.

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Carbon Offset Cost Comparison Calculator

Price voluntary offsetting against the tax rates modelled here.

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EV vs Gas Savings Calculator

Price the single change that removes the largest line from most households’ carbon bills.

green calculator

Carbon Tax Impact Calculator

Convert household fuel and electricity into tonnes of CO2e, price them at any carbon rate, and net off a dividend.

Quick actions: Save inputs, view saved runs, print, share, or export results

Saved Runs

Inputs

Carbon Tax Rate$/tonne

Dividend Per Person$/year

Gasolinegal/yr

Natural Gastherms/yr

ElectricitykWh/yr

Grid Intensitykg CO2/kWh

Heating Oilgal/yr

Air Travelmiles/yr

Household Sizepeople

Household Income$

Share of the Price Reaching Households%

Results

Annual Carbon Tax

$826.02

Per Month$68.84

Total Emissions12.71 tonnes CO2e

Per Person4.24 tonnes

Gasoline4.62 t — $300.38

Natural Gas3.39 t — $220.56

Electricity3.90 t — $253.21

Heating Oil0.00 t — $0.00

Flights0.80 t — $51.87

Dividend Received$0.00

Net Position$826.02 out of pocket

Net Per Month$68.84

Share of Income1.06%

Break-Even EmissionsNo dividend entered

Break-Even Tax RateNo dividend entered

Added to Gasoline57.77¢ per gallon

Added to Natural Gas34.46¢ per therm

Added to Electricity2.412¢ per kWh

Tip

Worth keeping when a carbon price is in the news: the household effect depends far more on the dividend design than on the rate itself.

Summary

Key output metrics

Annual Carbon Tax

$826.02

12.71 tonnes CO2e at $65.00 per tonne

Net After Dividend

$826.02

Out of pocket by $68.84 a month

Fuel Price Effect

57.8¢ per gallon

34.5¢ per therm of gas, 2.41¢ per kWh of electricity

D3 visualization

Where the Carbon Tax Falls

Annual tax by category. Driving and heating dominate for most households, which is why a carbon price is in practice a transport and heating policy.

Gasoline$300

Natural gas$221

Electricity$253

Flights$52

Guide

How to understand and use this calculator

Quick Answer — How Much Does a Carbon Tax Cost?

A carbon tax prices greenhouse gas emissions per tonne of CO2 equivalent. To find what it costs a household, convert each fuel into tonnes using its published emission factor, multiply by the rate, and subtract any dividend the scheme pays back.

The standard combustion factors, in kilograms of CO2 per unit:

Gasoline — 8.887 kg per gallon
Diesel — 10.18 kg per gallon
Natural gas — 5.302 kg per therm
Heating oil — 10.16 kg per gallon
Air travel — roughly 0.19 kg per passenger mile
Electricity — varies enormously; the US average is about 0.371 kg per kWh, but a hydro or nuclear grid can be under 0.05 and a coal-heavy one over 0.7

A three-person household burning 520 gallons of gasoline, 640 therms of gas, 10,500 kWh on an average grid and flying 4,200 miles emits 12.71 tonnes — about 4.24 tonnes per person. At $65 per tonne that is $826 a year, or $69 a month.

Most of the visible effect arrives as unit prices rather than a bill: at $65 a tonne, gasoline rises 57.8 cents a gallon, natural gas 34.5 cents a therm, and electricity 2.4 cents a kWh.

How to Use This Calculator: A Typical Household

Enter annual consumption for each fuel. Gasoline is the easiest to reconstruct — annual mileage divided by miles per gallon. Natural gas therms and electricity kWh come straight off twelve months of utility bills. Air miles are round-trip distances added up.

For the household above, the tax breaks down as $300 on gasoline (4.62 tonnes), $253 on electricity (3.90 tonnes), $221 on natural gas (3.39 tonnes) and $52 on flights (0.80 tonnes). Driving and heating dominate, which is the usual pattern and the reason a carbon price is really a transport and heating policy wearing a broader name.

With no dividend, that is $826 a year on a $78,000 income — 1.06%. Whether that is significant depends entirely on the household, which is why the dividend design matters so much.

The grid intensity input is the one worth getting right, because it swings the electricity line by a factor of ten. A household on a hydro-heavy grid at 0.05 kg/kWh pays $34 on the same 10,500 kWh; one on a coal-heavy grid at 0.7 pays $478. Your utility publishes this figure, and regional grid data is public. Guessing the national average when you live somewhere unusual will produce a number that is simply wrong. The carbon footprint calculator covers the same household emissions across a wider set of categories.

A Second Example: When the Dividend Makes You a Net Receiver

Most real carbon tax schemes are revenue-neutral: the money collected is returned to households as a flat per-person dividend rather than kept. That changes who pays entirely, because the tax scales with your emissions while the dividend does not.

Take a two-person household on a clean grid: 300 gallons of gasoline, no natural gas (heat pump), 6,200 kWh at 0.12 kg/kWh, and 900 air miles. Total emissions 3.58 tonnes — 1.79 per person. At $130 per tonne the tax is $466 a year. With a $280 per person dividend, the household receives $560.

Net position: $94.46 ahead, or about $7.87 a month in their favour, on a $52,000 income. They pay a carbon tax and finish better off, because they emit less than the average the dividend is sized against.

The calculator reports the crossover directly. At this dividend and rate, the break-even is 4.31 tonnes for the household — emit less and you gain, emit more and you pay. Equivalently, at their current 3.58 tonnes the tax rate at which they would break even is $156 per tonne; below that they are ahead.

This is the design feature that decides the politics. Because emissions rise with income but a flat dividend does not, a well-designed revenue-neutral carbon tax leaves the majority of households — typically those below the median — as net receivers, while high-emitting households pay. Whether any particular scheme achieves that depends on its rate, its dividend and its coverage, all of which you can test here.

Rates, Coverage and What the Number Leaves Out

Carbon prices in force around the world span an enormous range, from a few dollars a tonne to over a hundred, and they rise on published schedules in most schemes that have one. That is deliberate: a rising price gives households and businesses time to replace vehicles and heating systems on their natural replacement cycle rather than prematurely. Running the calculator at a rate several years out is a more useful exercise than running it at today's.

The social cost of carbon — the estimated damage each tonne causes — is a separate figure and sits well above most carbon prices actually charged, with recent estimates ranging from under $100 to over $300 per tonne. The gap between the two is the argument, and it is worth knowing which number a news story is quoting.

The pass-through input covers coverage. Real schemes tax some fuels and not others, apply upstream at different points, and exempt certain sectors. Setting pass-through below 100% models a scheme where only part of the price reaches household consumption — which is closer to how most of them work in their early years.

What this calculation deliberately omits is the indirect effect. A carbon price raises the cost of everything with embodied emissions: food, goods, construction materials, services. Studies of real schemes generally find the indirect burden is smaller than the direct one for most households but far from negligible, often adding 30% to 60% on top of the direct fuel cost. The number here is the part you can see on your own bills. For the goods side of that picture, the food miles calculator and the shipping carbon footprint calculator cover two of the larger components.

Limitations

This is an estimate of the direct fuel and electricity cost, not the total economic effect of a carbon price. The indirect burden through the price of goods and services is real, substantial, and not modelled here, so treat the output as a floor on the cost side rather than a complete figure.

The emission factors are standard combustion values for the fuel burnt. They do not include upstream emissions from extracting, refining and transporting that fuel, which add roughly 15% to 25% for petroleum products on a full life-cycle basis. A scheme that prices upstream emissions would charge more than this calculation shows.

The air travel factor is a single average per passenger mile, which is a crude simplification of a complicated question. Real aviation emissions per passenger mile vary widely with aircraft type, load factor, cabin class and stage length, and short flights are considerably worse per mile than long ones. Aviation also has non-CO2 warming effects — contrails and high-altitude nitrogen oxides — that many methodologies account for with a multiplier of roughly 1.7 to 3, which this factor does not include.

Finally, the calculation assumes your consumption stays exactly the same after the tax is applied. The entire purpose of a carbon price is that it does not: people drive less, insulate, switch heating and change purchasing when fuel gets more expensive. A household that responds pays less than this figure and emits less. The number here is what the tax costs if you change nothing, which makes it an upper bound on the direct cost rather than a prediction.

Related Calculators

The Carbon Footprint Calculator covers household emissions across a wider set of categories than the taxed fuels alone. The Carbon Offset Cost Comparison Calculator prices voluntary offsetting against the tax rates modelled here, which is a revealing comparison — offsets are usually far cheaper per tonne than a carbon price, and that gap is itself an argument about quality. The Tree Planting Carbon Offset Calculator covers the sequestration side, and the EV vs Gas Savings Calculator prices the single change that removes the largest line from most households' carbon bills.

Related concepts

CO2 Equivalent (CO2e)

A common unit that expresses all greenhouse gases in terms of the warming effect of an equivalent mass of carbon dioxide, so methane and nitrous oxide can be priced on the same scale.

Revenue-Neutral Carbon Tax

A design where all revenue is returned to households, usually as a flat per-person dividend. Because emissions rise with income and the dividend does not, most below-median households end up net receivers.

Grid Intensity

Kilograms of CO2 emitted per kilowatt-hour of electricity delivered. It varies from under 0.05 on hydro and nuclear grids to over 0.7 on coal-heavy ones, which makes it the single most consequential input in any household emissions calculation.

Frequently Asked Questions

How much does a carbon tax cost per household?+

It depends on emissions and the rate. A three-person household emitting 12.71 tonnes a year pays $826 at $65 per tonne, about $69 a month. A low-emitting two-person household at 3.58 tonnes pays $466 even at $130 per tonne. Driving and heating dominate the bill for most households.

How much does a carbon tax add to a gallon of gasoline?+

Gasoline emits 8.887 kg of CO2 per gallon, so each dollar per tonne adds about 0.89 cents a gallon. At $65 per tonne that is 57.8 cents; at $130 it is $1.16. Natural gas rises 34.5 cents a therm at $65, and electricity on an average US grid about 2.4 cents a kWh.

What is a carbon dividend?+

A flat payment returning carbon tax revenue to households, usually per person. Because the tax scales with your emissions and the dividend does not, households emitting less than the average end up net receivers. In the second example a household pays $466 in tax, receives $560, and finishes $94 ahead.

Will I come out ahead under a carbon dividend?+

If you emit less than the level the dividend is sized against, yes. This calculator reports your break-even directly: at $130 per tonne with a $280 per person dividend, a two-person household breaks even at 4.31 tonnes. Below that they gain, above it they pay.

Why does my electricity figure matter so much?+

Because grid intensity varies by more than tenfold. The same 10,500 kWh costs $34 on a hydro-heavy grid at 0.05 kg/kWh and $478 on a coal-heavy one at 0.7. Your utility publishes its figure and regional grid data is public — using the national average when your grid is unusual produces a badly wrong answer.

Does this include the higher price of goods?+

No. It covers the direct cost of the fuel and electricity you buy. A carbon price also raises the cost of anything with embodied emissions — food, goods, construction, services — and studies of real schemes typically find that indirect burden adds 30% to 60% on top of the direct one.

What is the social cost of carbon?+

The estimated economic damage each tonne of CO2 causes, which is a different figure from the price a scheme charges. Recent estimates range from under $100 to over $300 per tonne, well above most carbon taxes in force. The gap between the two is the substance of most policy arguments about the rate.

Will I actually pay this much?+

Probably less, because the calculation assumes you change nothing. The purpose of a carbon price is that behaviour shifts — driving less, insulating, switching heating. A household that responds pays less than this figure. Treat it as an upper bound on the direct cost rather than a prediction.

Formula

Carbon tax formulas and emission factors

Tonnes CO2e = annual consumption x emission factor / 1000
  Gasoline     8.887 kg per gallon
  Diesel      10.18  kg per gallon
  Natural gas  5.302 kg per therm
  Heating oil 10.16  kg per gallon
  Air travel   0.19  kg per passenger mile
  Electricity  grid intensity kg per kWh (your input)

Annual tax = total tonnes x rate per tonne x pass-through
Dividend = per-person payment x household size
Net cost = annual tax - dividend

Break-even tonnes = dividend / (rate x pass-through)
Cents per gallon = 8.887 / 1000 x rate x pass-through x 100

Step by step

How the calculation works

1Reconstruct annual consumption from bills and mileage. Gasoline gallons are annual miles divided by miles per gallon; therms and kWh come off twelve months of utility statements; air miles are round-trip distances added up.
2Grid intensity is the input most worth getting right. Your utility publishes it and regional grid data is public. Using a national average when your grid is unusually clean or dirty will produce a badly wrong electricity figure.
3The dividend is what decides most households. Set it to the per-person payment a scheme proposes, and the calculator reports the emissions level at which you break even — below it you gain, above it you pay.
4Pass-through models coverage. Real schemes tax some fuels and not others and apply upstream at different points, so setting it below 100% approximates a scheme where only part of the price reaches household consumption.
5The result covers direct fuel and electricity only. A carbon price also raises the cost of goods with embodied emissions, typically adding 30% to 60% on top. The [carbon footprint calculator](/calculators/carbon-footprint-calculator) covers the wider emissions picture.

Related guides

Learn more about this calculation

Guide

Carbon Tax Impact Calculator

Inputs

Results

Carbon tax formulas and emission factors

How the calculation works

Learn more about this calculation

Carbon Footprint Reduction Guide: Measure, Prioritize, and Cut Emissions

Understanding Calculator Formulas: How DTC Turns Inputs into Results

Carbon Footprint Calculator

Carbon Offset Cost Comparison Calculator

EV vs Gas Savings Calculator

Key facts

Carbon Tax Impact Calculator

Inputs

Results

Key output metrics

Where the Carbon Tax Falls

How to understand and use this calculator

Quick Answer — How Much Does a Carbon Tax Cost?

How to Use This Calculator: A Typical Household

A Second Example: When the Dividend Makes You a Net Receiver

Rates, Coverage and What the Number Leaves Out

Limitations

Related Calculators

Related concepts

Frequently Asked Questions

Carbon tax formulas and emission factors

How the calculation works

Learn more about this calculation

Carbon Footprint Reduction Guide: Measure, Prioritize, and Cut Emissions

Understanding Calculator Formulas: How DTC Turns Inputs into Results

Carbon Footprint Calculator

Carbon Offset Cost Comparison Calculator

EV vs Gas Savings Calculator

Key facts

Key output metrics

Where the Carbon Tax Falls

How to understand and use this calculator

Quick Answer — How Much Does a Carbon Tax Cost?

How to Use This Calculator: A Typical Household

A Second Example: When the Dividend Makes You a Net Receiver

Rates, Coverage and What the Number Leaves Out

Limitations

Related Calculators

Related concepts

Frequently Asked Questions