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Net-Zero Emissions Reduction Gap Calculator

How much you need to cut each year to hit a net-zero target date.

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Rex says

Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.

Try a scenario

Click to load — tweak from there.

Inputs

Result

Required annual reduction rate

8.48%

Gap vs. your current trajectory

6.48%

Target residual emissions

5,000

Where current rate lands you at target year

29,570

Years to target

26

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How to use this

  1. 1Enter current annual emissions (tCO2e).
  2. 2Enter baseline year.
  3. 3Enter net-zero target year.
  4. 4Enter residual emissions at target (% of baseline) (%).
  5. 5Enter your current annual reduction rate (%).
  6. 6Read your required annual reduction rate on the right — it updates as you type.
  7. 7Hit Share to keep the scenario or send it to someone.

About this calculator

Setting a net-zero target year is easy; figuring out the annual reduction rate required to actually get there is the part most companies skip. This calculator takes your current baseline emissions, target year, and desired end-state (near-zero, typically 90%+ reduction under SBTi's Net-Zero Standard) and computes the required compound annual reduction rate along with a year-by-year glide path. It compares that required rate against your historical reduction rate if you provide one, flagging the gap between what you're actually achieving and what the target demands. Most companies discover the required rate is steeper than their current trajectory, especially in the early years of a commitment when reduction projects haven't yet scaled — this tool exists to surface that gap early, before a public commitment becomes a credibility problem down the line.

FormulaRequired annual reduction rate r solves: baseline × (1−r)^years = target emissions. r = 1 − (target/baseline)^(1/years).

Worked example

Using the values the calculator loads with:

Inputs

  • Current annual emissions: 50000 tCO2e
  • Baseline year: 2024
  • Net-zero target year: 2050
  • Residual emissions at target (% of baseline): 10 %
  • Your current annual reduction rate: 2 %

Results

  • Required annual reduction rate: 8.48%
  • Gap vs. your current trajectory: 6.48%
  • Target residual emissions: 5,000
  • Where current rate lands you at target year: 29,570
  • Years to target: 26

What each field means

Inputs

Current annual emissions (tCO2e)
The current annual emissions used in the calculation, measured in tCO2e. Starts at 50000 tCO2e so you have a working example on load.
Baseline year
The baseline year used in the calculation. Starts at 2024 so you have a working example on load. Accepted range: 2000–2050.
Net-zero target year
The net-zero target year used in the calculation. Starts at 2050 so you have a working example on load. Accepted range: 2025–2100.
Residual emissions at target (% of baseline) (%)
The residual emissions at target (% of baseline) used in the calculation, measured in %. Starts at 10 % so you have a working example on load. Accepted range: 0–50 %.
Your current annual reduction rate (%)
The your current annual reduction rate used in the calculation, measured in %. Starts at 2 % so you have a working example on load. Accepted range: -20–30 %.

Results

Required annual reduction rate
Returned as a percentage and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Gap vs. your current trajectory
Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Target residual emissions
Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Where current rate lands you at target year
Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Years to target
Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.

FAQ

Why residual emissions instead of exactly zero?

SBTi's Net-Zero Standard and most credible frameworks recognize that some emissions (certain industrial processes, aviation, agriculture) are technically or economically infeasible to eliminate by mid-century with current technology. They require 90-95% absolute reduction from baseline, with the small remainder addressed through durable carbon removal rather than avoidance offsets.

What if the required rate looks unrealistically steep?

That's common, and it usually means either the target year needs revisiting, the baseline year should be moved earlier to capture more runway, or the company needs a step-change project (like a major electrification or renewable procurement initiative) rather than incremental annual efficiency gains to close the gap.

Does this account for revenue growth diluting the absolute target?

No — this calculator works in absolute tons, which is what SBTi's most rigorous absolute contraction approach requires regardless of growth. If your target is intensity-based instead, use the carbon-intensity-per-revenue calculator alongside this one, since intensity targets and absolute targets require different math and different glide paths.

Accuracy and limitations

  • Estimates assume standard, average conditions — local rules, pricing, and materials vary.
  • Results are rounded for readability; add a buffer before ordering, booking, or committing.
  • Double-check anything with a real cost attached against a local quote.

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Cite this calculator

Writing about this topic? Grab a citation — every link helps keep these tools free.

APA
RevenueLab. (2026). Net-Zero Reduction Gap Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/net-zero-gap
HTML
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/net-zero-gap" target="_blank" rel="noopener">Net-Zero Reduction Gap Calculator — RevenueLab</a> (2026).</p>
Markdown
Source: [Net-Zero Reduction Gap Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/net-zero-gap) (2026).
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