# Free freight calculators

> Free freight calculators for air chargeable weight, LTL class, detention, demurrage, fuel surcharges, cost per mile and cross-dock fees, with worked examples.

URL: https://roadmark.ai/tools
Language: en

Seven calculators for the weights, charges and costs freight people work out every day: air chargeable weight, LTL density and freight class, truck detention, container demurrage, truckload fuel surcharges, a truck's cost per mile and a cross-dock visit's fees. Each one shows its formula, a worked example with real numbers and the rules it follows, so you can check the answer yourself.

## Pick a calculator.

No sign-up. Each works in your browser and starts from a worked example, so you can see the method before you type your own numbers.

- [Chargeable weight calculator](https://roadmark.ai/tools/chargeable-weight): Actual against volumetric weight for an air shipment, at IATA's 6,000 cm³/kg or 166 in³/lb, line by line.
- [Freight class calculator](https://roadmark.ai/tools/freight-class): Density in pounds per cubic foot for each pallet, and the class the NMFC's 13-sub density scale gives it.
- [Detention calculator](https://roadmark.ai/tools/detention): What a truck's time at the dock past its free time comes to, on the invoice and on the driver's pay.
- [Demurrage and per diem calculator](https://roadmark.ai/tools/demurrage): Last free day, charged days and the total for a container at the terminal or out on per diem, with tiered rates.
- [Fuel surcharge calculator](https://roadmark.ai/tools/fuel-surcharge): Surcharge per mile from the diesel price, the base price and miles per gallon, the total for a trip and its share of the linehaul.
- [Cost per mile calculator](https://roadmark.ai/tools/cost-per-mile): A truck's fixed and per-mile costs over the miles it runs, as a cost per mile, and the margin at a rate per mile.
- [Cross-dock fee calculator](https://roadmark.ai/tools/cross-dock-fees): A cross-dock visit's bill: handling per pallet in and out, the minimum, storage after the free time and extras, per pallet and against what you charge.

## Built so you can check the answer.

A number you can't check is a number you'll argue about with a customer.

- **The formula, in plain text:** Every page writes out the arithmetic it does, term by term.
- **A worked example:** Real numbers from a real-looking load, computed by the same code as the calculator.
- **Where the rules come from:** Factors and tables are named with their source and the date they took effect.

## Related pages

- [NMFC density-based freight class: what changed in 2025](https://roadmark.ai/blog/nmfc-density-freight-class): Since July 19, 2025, most LTL freight is classed by density on a 13-step NMFC scale. How to measure it, what it means for quotes, and how to avoid reweighs.
- [Demurrage vs per diem vs detention in drayage](https://roadmark.ai/blog/demurrage-per-diem-detention): Who charges demurrage, per diem and detention on a container, when each clock starts and stops, and a worked import example with every charge computed.
- [Truck detention: how to measure it, bill it and pay drivers](https://roadmark.ai/blog/truck-detention-billing): How detention time is measured (ELD, geofence and dock timestamps against the appointment), free time, billing without disputes and the driver's share.
- [Cross-docking for freight brokers: fees, load plans and OS&D](https://roadmark.ai/blog/cross-docking-for-freight-brokers): When cross-docking pays for a brokerage: rate cards, late inbounds, load plans, short and damaged pallets, and a day too long on the floor, with worked numbers.
- [Blog](https://roadmark.ai/blog): Notes on freight software and AI

Companies, people and shipment figures in product examples are fictional. They illustrate workflows and are not customer testimonials or measured results.