# Towing Rating Cross-Check Calculator — Canada

> Cross-check multiple entered weight ratings instead of treating the advertised maximum tow rating as the only limit. CAD planning view; stated limitations apply.

Page: https://askcalculators.com/ca/towing-capacity/
Definition: https://askcalculators.com/ca/towing-capacity/definition.json
JSON Schema: https://askcalculators.com/ca/towing-capacity/schema.json
Version: 20.16.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/ca/towing-capacity/?unitSystem=metric&gcwr=6000&loadedVehicle=2500&towRating=3000&payloadRemaining=500&tonguePercent=12&hitchTrailerLimit=3000&hitchTongueLimit=350

## Inputs
- unitSystem: Measurement system; type=select; optional; default=metric; values=imperial|metric
- gcwr: Manufacturer gross combination weight rating; type=number; required; default=6000; min=0; max=1000000000000
- loadedVehicle: Actual loaded tow-vehicle weight before trailer tongue; type=number; required; default=2500; min=0; max=1000000000000
- towRating: Configuration-specific manufacturer trailer rating; type=number; required; default=3000; min=0; max=1000000000000
- payloadRemaining: Actual remaining vehicle payload; type=number; required; default=500; min=0; max=1000000000000
- tonguePercent: Measured/expected trailer tongue-weight fraction; type=percent; required; default=12; min=0; max=50
- hitchTrailerLimit: Hitch trailer-weight rating; type=number; required; default=3000; min=0; max=1000000000000
- hitchTongueLimit: Hitch tongue-weight rating; type=number; required; default=350; min=0; max=1000000000000

## Outputs
- combinationLimit: Trailer allowance from combination rating; format=number
- payloadLimit: Trailer allowance from remaining payload; format=number
- hitchLimit: Trailer allowance from hitch tongue rating; format=number
- limitingWeight: Lowest entered arithmetic trailer allowance; format=number; primary

## Formula
arithmetic trailer allowance = minimum(combination rating − loaded vehicle, vehicle tow rating, remaining payload/tongue fraction, hitch rating, hitch tongue rating/tongue fraction).

Inputs are converted to canonical units before evaluating this stated formula.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Illustrative defaults are not local quotes or verified legal rules. Dated reference components and user-entered assumptions are explicitly distinguished. Professional review is pending.