# Bunker Calculator — Free voyage and fuel calculator > Calculate sea and port fuel, safety margin and bunker cost from distance, speed and daily consumption. - URL: https://demo.fcrsoft.com/en/maritime/bunker-calculator - Language: en - Updated: 2026-10-03 - Publisher: FCRSOFT (https://fcrsoft.com) [Demos](https://demo.fcrsoft.com/?hl=en) / [Free Tools](https://demo.fcrsoft.com/en/tools) / [Maritime Calculators](https://demo.fcrsoft.com/en/maritime) / Bunker Calculator Free tool # Bunker Calculator Calculate sea and port fuel, safety margin and bunker cost from distance, speed and daily consumption. No sign-up needed; results update as you type. [See the system that does this automatically Open the live demo](https://demo.fcrsoft.com/login.php?package=shipowner) ## Calculator Currency Distance : 3200 nm Speed : 12.5 knots Daily consumption at sea : 28 t/gün Days in port : 4 days Daily consumption in port : 3 t/gün Weather and safety margin : 5 % Fuel price per ton : 620 USD This calculator runs in your browser; the data you enter is not stored. ## Results Sea days 10.67 days Sea fuel 313.6 t Port fuel 12.0 t Total fuel 325.6 t Bunker cost 201,872 USD **Track Voyage Economics Live**Result: **325.6**. FCRSOFT records each voyage’s estimate and actual and calculates TCE automatically. [Open the live demo](https://demo.fcrsoft.com/login.php?package=shipowner) [Request a demo](https://fcrsoft.com/en/contact/) ## Bunker Calculator: what you need to know The bunker calculation finds voyage fuel from distance, speed and daily consumption, port fuel from port days, and fuel cost from the price per tonne. Fuel is usually the largest voyage cost item. **Expert tip:** Consumption varies roughly with the cube of speed: cutting speed by 10% lowers daily consumption by about 27%; keep a 3–10% margin for weather and currents. ## Bunker Calculator: worked example Example values: Distance 3,200 nm, Speed 12.5 knots, Daily consumption at sea 28 t/gün, Days in port 4 days, Daily consumption in port 3 t/gün, Weather and safety margin 5 %, Fuel price per ton 620 USD. With these values the results are: | Sea days | 10.67 days | | Sea fuel | 313.6 t | | Port fuel | 12.0 t | | Total fuel | 325.6 t | | Bunker cost | 201,872 USD | ### How to use: Bunker Calculator - Enter your own values: Distance, Speed, Daily consumption at sea, Days in port, Daily consumption in port, Weather and safety margin, Fuel price per ton. - Choose the currency; money inputs are converted at an approximate rate. - Results are calculated as you type: Sea days, Sea fuel, Port fuel, Total fuel. - Check every step of the calculation in the formulas below. ## How is it calculated? - **Sea days** = [Distance] ÷ ([Speed] × 24) - **Sea fuel** = [Sea days] × [Daily consumption at sea] × (1 + [Weather and safety margin] ÷ 100) - **Port fuel** = [Days in port] × [Daily consumption in port] - **Total fuel** = [Sea fuel] + [Port fuel] - **Bunker cost** = [Total fuel] × [Fuel price per ton] ## Other tools running on Voyage Economics Engine Calculates voyage result and TCE from distance, speed, sea and port days, fuel, port, canal and hire costs. - [Vessel Fuel Consumption](https://demo.fcrsoft.com/en/maritime/vessel-fuel-consumption) - [Ship Fuel Cost](https://demo.fcrsoft.com/en/maritime/ship-fuel-cost) - [Voyage Fuel Calculator](https://demo.fcrsoft.com/en/maritime/voyage-fuel-calculator) - [Daily Fuel Consumption](https://demo.fcrsoft.com/en/maritime/daily-fuel-consumption) - [Fuel per Nautical Mile](https://demo.fcrsoft.com/en/maritime/fuel-per-nautical-mile) - [Bunker Cost](https://demo.fcrsoft.com/en/maritime/bunker-cost) - [VLSFO Cost](https://demo.fcrsoft.com/en/maritime/vlsfo-cost) - [MGO Cost](https://demo.fcrsoft.com/en/maritime/mgo-cost) - [ULSFO Cost](https://demo.fcrsoft.com/en/maritime/ulsfo-cost) - [Fuel Cost per Ton of Cargo](https://demo.fcrsoft.com/en/maritime/fuel-cost-per-ton-cargo) - [Voyage Cost Calculator](https://demo.fcrsoft.com/en/maritime/voyage-cost-calculator) - [Voyage Profit Calculator](https://demo.fcrsoft.com/en/maritime/voyage-profit-calculator) FCRSOFT ## FCRSOFT does this for you automatically You don’t need to do the calculations and checks on this page by hand every day. FCRSOFT derives them all automatically from the records entered in the field. - Fuel, port and canal costs are recorded for every voyage. - TCE and voyage result are compared as estimate versus actual. - Bunker purchases and consumption are tracked per voyage. [Open the live demo](https://demo.fcrsoft.com/login.php?package=shipowner) [Explore the Shipowner & Ship Management package](https://demo.fcrsoft.com/demo/shipowner?hl=en) [demo.fcrsoft.com](https://demo.fcrsoft.com/login.php?package=shipowner) ## Frequently asked questions How is Bunker Calculator calculated? Calculate sea and port fuel, safety margin and bunker cost from distance, speed and daily consumption. The calculation uses Voyage Economics Engine: Calculates voyage result and TCE from distance, speed, sea and port days, fuel, port, canal and hire costs. Bunker Calculator: what is it and when is it used? The bunker calculation finds voyage fuel from distance, speed and daily consumption, port fuel from port days, and fuel cost from the price per tonne. Fuel is usually the largest voyage cost item. Bunker Calculator: what should I watch out for? Consumption varies roughly with the cube of speed: cutting speed by 10% lowers daily consumption by about 27%; keep a 3–10% margin for weather and currents. How is Total fuel found? Total fuel = [Sea fuel] + [Port fuel]. With the example values (Distance 3,200 nm, Speed 12.5 knots, Daily consumption at sea 28 t/gün, Days in port 4 days, Daily consumption in port 3 t/gün, Weather and safety margin 5 %) the result is 325.6 t. How is Bunker cost found? Bunker cost = [Total fuel] × [Fuel price per ton]. With the example values (Distance 3,200 nm, Speed 12.5 knots, Daily consumption at sea 28 t/gün, Days in port 4 days, Daily consumption in port 3 t/gün, Weather and safety margin 5 %) the result is 201,872 USD. Worked example: Bunker Calculator Example values: Distance 3,200 nm, Speed 12.5 knots, Daily consumption at sea 28 t/gün, Days in port 4 days, Daily consumption in port 3 t/gün, Weather and safety margin 5 %. Sea days: 10.67 days; Sea fuel: 313.6 t; Port fuel: 12.0 t; Total fuel: 325.6 t; Bunker cost: 201,872 USD. Is Bunker Calculator free? Yes. The tool is free, needs no sign-up and runs in your browser; the data you enter is not stored. Can FCRSOFT do this calculation automatically? FCRSOFT records each voyage’s estimate and actual and calculates TCE automatically. You can try the Shipowner & Ship Management package in the live demo without installing anything. Which currency can I calculate in? Choose one of 28 currencies in the currency selector; monetary inputs are converted at an approximate rate. To use your own rate, enter the amounts directly. ## Related tools and guides [Free tool ### Voyage Fuel Calculator Calculate a voyage’s total fuel need and bunkering quantity with separate speed and consumption for ballast and laden legs. Open the tool](https://demo.fcrsoft.com/en/maritime/voyage-fuel-calculator) [Free tool ### Bunker Cost Calculate the total bunker invoice from VLSFO and MGO quantities, prices and barge and survey fees. Open the tool](https://demo.fcrsoft.com/en/maritime/bunker-cost) [Free tool ### Voyage Cost Calculator Add fuel, port, canal, agency, insurance and commission costs to calculate voyage cost and cost per ton. Open the tool](https://demo.fcrsoft.com/en/maritime/voyage-cost-calculator) [Free tool ### Voyage Estimate Calculate voyage result and TCE on one screen from ballast and laden legs, port days, fuel, port and canal costs, freight and commissions. Open the tool](https://demo.fcrsoft.com/en/maritime/voyage-estimate)