LNG Tools

LNG Calculator

Convert LNG between volume, mass and energy units, and run a quick voyage cost estimate — built on standard industry conversion factors used across the LNG trade.

Henry Hub Indexed LNG & Price Intelligence

A complete LNG calculation toolkit.

Seven tools in one: unit conversion, voyage economics, route comparison, investment breakeven, emissions and carbon cost, demurrage & laytime, and LNG density / heating value from composition — all built on standard industry formulas.

Quantity

Convert to

From unit

Result

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Reference basis: 1 metric tonne (MT) of LNG ≈ 52.0 MMBtu ≈ 1,380 m³ of natural gas, and 1 m³ of liquid LNG ≈ 0.45 MT. LNG density and heating value vary slightly with composition; results are approximate and provided as a professional guide only.

52.0

MMBtu per tonne LNG

1,380

m³ gas per tonne LNG

0.45

tonnes per m³ liquid LNG

-162°C

LNG storage temperature

Cargo size (m³ LNG)

One-way distance (nautical miles)

Speed (knots)

Charter hire ($/day)

Fuel cost ($/day)

Boil-off (% per day)

Port & canal costs ($ total)

LNG sale price ($/MMBtu)

Round-trip days

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Delivered cargo

—

Total voyage cost

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Estimated cargo value & unit freight

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Round-trip includes laden + ballast legs. Boil-off is applied over the laden voyage and reduces delivered volume. Delivered energy uses 1 MT LNG = 52.0 MMBtu and density 0.45 MT/m³. This is a simplified planning estimate — actual voyage economics depend on route, canal transit, weather, hire terms and cargo composition.

Compare up to three routes or vessels side by side. Enter each option’s parameters; delivered energy, voyage cost and unit freight are computed with the same standard factors as the Voyage Calculator.

Option A

Cargo (m³)

Distance (nm, one-way)

Speed (knots)

Day rate: hire+fuel ($/day)

Boil-off (%/day)

Port/canal ($)

Round-trip—

Delivered—

Voyage cost—

Unit freight—

Option B

Cargo (m³)

Distance (nm, one-way)

Speed (knots)

Day rate: hire+fuel ($/day)

Boil-off (%/day)

Port/canal ($)

Round-trip—

Delivered—

Voyage cost—

Unit freight—

Option C

Cargo (m³)

Distance (nm, one-way)

Speed (knots)

Day rate: hire+fuel ($/day)

Boil-off (%/day)

Port/canal ($)

Round-trip—

Delivered—

Voyage cost—

Unit freight—

Lowest unit freight

—

Unit freight = total voyage cost ÷ delivered energy (MMBtu). The lowest-cost option per unit of delivered energy is highlighted. Day rate combines charter hire and fuel for simplicity.

Capex / project cost ($ M)

Capacity (MTPA)

Project life (years)

Opex ($/MMBtu)

Feed gas cost ($/MMBtu)

Discount rate / WACC (%)

Annual energy (MMBtu)

—

Capital charge ($/MMBtu)

—

Payback (undiscounted)

—

Breakeven LNG price (cost of supply)

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Breakeven = feed gas + opex + levelized capital charge. Capital charge uses a capital recovery factor CRF = i(1+i)ⁿ / ((1+i)ⁿ−1) over project life, spread across annual energy (MTPA × 52 MMBtu/tonne × 10⁶). Simplified model excluding shipping, tax and financing structure.

Cargo delivered (MT LNG)

Voyage fuel burn (MT LNG + MGO)

Carbon price ($/t CO₂e)

EU ETS coverage (% of voyage)

Include cargo combustion (Scope 3)

Voyage CO₂ (shipping)

—

Cargo combustion CO₂

—

Total CO₂e

—

Estimated carbon cost

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Uses standard factors: burning LNG emits ≈ 2.75 t CO₂ per tonne LNG; delivered cargo combustion ≈ 2.75 t CO₂/t. Carbon cost applies the carbon price to voyage emissions (scaled by EU ETS coverage) plus cargo combustion when lifecycle is selected. Indicative only.

Allowed laytime (hours)

Time actually used (hours)

Demurrage rate ($/day)

Despatch rate ($/day, if early)

Excluded / laytime-stopped hours

Countable time used

—

Time on demurrage

—

Time saved

—

Amount payable

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If countable time used exceeds allowed laytime, demurrage is due (owner-favourable). If less, despatch may be payable (charterer-favourable), commonly at half the demurrage rate. Excluded hours are subtracted from time used. Simplified charter-party model.

Enter mole % of each component (should total ~100%). Density uses pure-component saturated liquid densities with ideal molar-volume mixing; gross heating value uses ISO 6976 per-component GCV.

Methane C₁ (mol %)

Ethane C₂ (mol %)

Propane C₃ (mol %)

Butane C₄ (mol %)

Nitrogen N₂ (mol %)

Total

LNG density

—

Molar mass

—

Gross HHV

—

Energy density of this LNG

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Pure-component liquid densities (kg/m³): C₁ 422.6, C₂ 544.1, C₃ 582.0, C₄ 601.4, N₂ 808.6. GCV (MJ/mol, ISO 6976): C₁ 0.8906, C₂ 1.5605, C₃ 2.2197, C₄ 2.8779, N₂ 0. Accurate to ~0.25% for methane-rich LNG; results are a professional guide.

LNG Calculator Disclaimer: The LNG Calculator provided by USLNGexport.com is offered solely for informational, educational, and preliminary planning purposes. While the calculator uses generally accepted industry formulas and engineering principles, all results are estimates only and are provided on an "AS IS" basis without any express or implied warranties regarding their accuracy, completeness, reliability, or suitability for any particular purpose. Actual LNG properties, voyage economics, emissions, carbon costs, investment returns, shipping performance, market conditions, and commercial outcomes may vary significantly. Users are solely responsible for verifying all inputs, assumptions, calculations, and results with qualified engineering, financial, legal, and commercial professionals before making any operational, investment, contractual, or business decisions. By using this calculator, you agree that USLNGexport.com, its owners, affiliates, employees, and partners shall not be liable for any direct, indirect, incidental, consequential, or financial losses arising from the use of or reliance upon the calculator or its results.

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