Pick a calculator
Fuel & Fluids
Trip fuel cost, DEF consumption, and coolant mix ratio.
02Gear Ratio & Tires
Engine RPM at speed, and speedometer error from tire size.
03Towing & Payload
Payload capacity and trailer tongue weight.
04Engine Displacement
Bore, stroke, and cylinder count to CID and liters.
05Shop Tools
Torque conversion, Ohm's Law, and battery runtime.
06Trip Planner
ETA, tire pressure vs. temperature, and stopping distance.
07Hours of Service
Remaining drive time under the 11/14-hour rules.
08Axle Weights
Front/rear axle load distribution for a straight truck.
09Cargo & Load Space
Cargo volume and pallet count for a bed or trailer.
10Cost Per Mile
Operating cost per mile and a suggested minimum rate.
11Tire Tread Life
Remaining tire miles from your current wear rate.
Built for the shop, the field, and the road
Every calculator here uses standard automotive and trucking-industry formulas — the same math a diesel tech, fleet mechanic, or gearhead would use with a notepad. Enter your numbers and get a straight answer: gallons, ratios, pounds, or cubic inches, plus notes on where the formula comes from so you're not trusting a black box.
Results are estimates for planning purposes. Always confirm critical figures — towing capacity, payload, and gearing — against your vehicle or equipment manufacturer's specs before loading or driving.