Non-CO₂ GHG Measurement, Methane Slip, Nitrous Oxide & Monitoring Architecture

Marine CH₄/N₂O Emissions Measurement, CEMS & Engine-Load Monitoring Cost Tool

Estimate methane and nitrous-oxide emissions from the entered engine duty profile, then compare full continuous emissions measurement, engine-load monitoring with measured emission maps, and a targeted hybrid strategy. Size analyzers, sampling points, load interfaces and test campaigns, compare data coverage and uncertainty targets, calculate installation and lifecycle monitoring cost, and identify which engines should receive direct CEMS first.

Currency
Currency selector changes display only. No exchange-rate conversion is performed.

Project & Reporting Basis

IMO MEPC 84 adopted 2026 guidelines for onboard / test-bed CH₄ and N₂O measurement, engine-load monitoring and CEMS. This calculator treats the methods as engineering and cost options. It does not assume that a particular method is mandatory for your ship.

years
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Project screening limit only. Use the uncertainty basis required by the applicable guideline, verifier or reporting scheme.
× CH₄
× N₂O
Editable accounting multipliers. Enter the values required by your reporting framework.
$ / hour
$

Simple Engine / Exhaust-Source Profile

kW
h/year
%
g/kWh
g/kWh
g/kWh

Engine / Exhaust Source Register

Use one row per engine type or source group. The tool expands the entered quantity for hybrid CEMS prioritization, ranking direct-measurement points by estimated CH₄/N₂O CO₂e contribution.

Engine / source Qty Rated kW h/yr Avg load % SFOC g/kWh CH₄ g/kWh N₂O g/kWh

CEMS Cost & Performance

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%
$
Entered cost should cover the selected CH₄ / N₂O gas scope and analyzer technology.
$
$
$
hours
$ / analyzer
$ / point
$
years
$ / analyzer
%

Engine-Load Monitoring + Emission Map Cost

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$
$
$
$
$
hours
$
$
years
$
%
%
% load
% load

Targeted Hybrid Monitoring Strategy

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The tool assigns CEMS first to the highest estimated CH₄/N₂O CO₂e sources. Remaining sources use ELM.
%
Measurement-planning screen only: Emission factors in g/kWh are user inputs used to estimate emissions and prioritize sources. They are not IMO default factors and are not a substitute for test-bed, onboard or CEMS measurements. Method uncertainty, data completeness and readiness scores are also project inputs. Final instrumentation, calibration, analyzer performance, emission-map development, verification and reporting must follow the applicable IMO, EU, flag, class, verifier and equipment requirements.
2026 regulatory context: IMO MEPC 84 adopted MEPC.414(84) for test-bed and onboard CH₄/N₂O measurements, MEPC.415(84) for engine-load monitoring and calculated emission values, and MEPC.416(84) for CEMS used to quantify CH₄ and/or N₂O emissions from marine diesel engines. IMO reported that, without prejudice to future mandatory frameworks, actual tank-to-wake values may be quantified voluntarily using ELM with the 2026 measurement guidelines and/or CEMS. Separately, EU maritime MRV has included CH₄ and N₂O emissions released from 2024 onwards. Verify the current scope and accepted method for the ship and reporting program.
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