Free Shipping & Chartering Tools
Professional-grade calculators and converters for ship owners, charterers, brokers, and operators. Built by industry professionals, free to use, no signup required for basic features.
Why We Built These Tools
The shipping industry relies on calculations that happen thousands of times a day — laytime, freight rates, voyage economics — yet most professionals still rely on spreadsheets or expensive enterprise software. The Charter Box offers a simpler alternative: fast, accurate, browser-based tools designed for real-world chartering workflows.
Whether you’re calculating demurrage on a multi-port voyage, converting freight rates between Worldscale and dollars per metric ton, or estimating the profitability of a new fixture, our tools give you answers in seconds.
Our Tools
⚓ Laytime Calculator
Calculate laytime, demurrage, and despatch with confidence. Our Laytime Calculator handles multi-port voyages, reversible laytime, weather working days (WWD), and complex charter party terms that trip up spreadsheet-based calculations.
Key features:
- Multi-port support with independent laytime rules per port
- Reversible and non-reversible laytime calculations
- Built-in holiday calendars for 60+ countries
- Charter party presets for common fixture types
- Notice of Readiness (NOR) rules with custom exceptions
- Color-coded breakdown showing exactly how time was counted
- Export to PDF or Excel for client reports
- Save and load calculations for reuse
- Email results directly from the tool
Best for: Ship owners, charterers, operations managers, post-fixture teams, and anyone handling laytime disputes or demurrage claims.
💱 Freight Rate Converter
The Freight Rate Converter is an all-in-one toolkit for freight professionals who need to work with multiple rate units, weights, container loads, and surcharge calculations throughout the day.
Key features:
- Convert between freight rate units including Worldscale, USD per metric ton, lump sum, and more
- Chargeable weight calculator for air and ocean freight
- Rate calculator with six pre-loaded trade lane surcharge presets
- Container load planner for FCL and LCL shipments
- Demurrage and detention calculator
- Complete Incoterms 2020 reference guide
- Export calculations to PDF for quotes and documentation
Best for: Freight forwarders, brokers, logistics coordinators, sales teams quoting rates, and anyone comparing freight options across trade lanes.
Use the Freight Rate Converter →
📊 Voyage Estimator
The Voyage Estimator calculates Time Charter Equivalent (TCE), bunker consumption, voyage P&L, and profitability before you fix a deal. Built on a database of approximately 800 ports with accurate distance calculations and automatic bunker price updates.
Key features:
- Full voyage P&L with revenue, costs, and margin breakdown
- Time Charter Equivalent (TCE) calculation
- Built-in port distance database with routing factors for 800+ ports
- Automatic bunker price fetching via live API
- Sea days calculation with weather factors
- Port autocomplete for fast voyage setup
- Multi-leg voyage support
- Export estimates to PDF
Best for: Ship owners evaluating fixtures, charterers comparing voyage options, brokers running quick estimates for clients, and commercial teams making go/no-go decisions on cargoes.
Who Uses The Charter Box
Our tools are used by professionals across the shipping industry:
- Ship owners calculating demurrage and voyage economics
- Charterers comparing fixture options and managing laytime
- Ship brokers running fast estimates for client inquiries
- Freight forwarders converting rates and planning container loads
- Operations managers handling post-fixture calculations
- Commercial teams evaluating the profitability of new trades
Why Free?
We built The Charter Box because the shipping industry deserves better tools. Basic calculations shouldn’t be locked behind enterprise software licenses or buried in legacy spreadsheets. Our core tools are free to use, and we’re actively adding new features based on feedback from the shipping community.
Some premium features like save, export, and email results require a free account — which takes 30 seconds and gives you full access.
More Tools Coming Soon
We’re continuously building new tools for the shipping and chartering industry. Upcoming additions include canal cost estimators, ECA zone fuel switching calculators, EU ETS carbon cost tools, and more. Follow us on LinkedIn or create an account to get updates.
Get Started
All three tools are free, browser-based, and require no installation. Pick the tool you need and start calculating in seconds.
Laytime Calculator • Freight Rate Converter • Voyage Estimator