Find trailers near you
📍 Detecting your location…
We'll show available trailers near you.
—
No trailers matched within 100 miles. Try another location.
Browse all trailers →Unable to fetch results.
How This Weight Distribution Hitch Calculator Works
A weight distribution hitch, or WDH, spreads a trailer's tongue weight across both axles of your tow vehicle instead of letting it all pile onto the rear. It's what keeps a heavy trailer from squatting the back of your truck, lifting the front, and making the whole rig feel loose. This WDH calculator tells you whether you need one and what size to get, based on the single number that matters most: your tongue weight as a percentage of your tow vehicle's weight.
How to Use This Calculator
Two inputs give you a clear recommendation.
- Enter your tow vehicle GVWR. Put in the gross vehicle weight rating of your truck or SUV. The default is 6,900 lbs, and you can edit it.
- Enter your trailer tongue weight. Add the downward weight your trailer puts on the hitch. The default is 700 lbs, and if you don't know it, the Tongue Weight Calculator will give you the figure.
- Read the tongue percentage and recommendation. The tool shows your tongue weight as a percentage of the tow GVWR, and whether a WDH is not needed, recommended, or strongly recommended.
- Read the suggested WDH size. It also recommends a hitch size from the common ratings, so you know what to buy.
How It's Calculated
The whole recommendation turns on one percentage: how big your tongue weight is compared to your tow vehicle.
Tongue percentage = (tongue weight / tow vehicle GVWR) x 100
The tool then reads that percentage against three bands:
| Tongue % of Tow GVWR | Recommendation |
|---|---|
| Under 10% | WDH not needed (tongue load is light) |
| 10% to 15% | WDH recommended (well-balanced load) |
| Over 15% | Strongly recommended (very high tongue load) |
For sizing, WDH systems come in standard ratings of 600, 800, 1,000, and 1,200 lbs. The tool picks the first size that meets or exceeds your tongue weight, so the hitch is rated for the load it has to distribute. If your tongue weight is above every listed size, it points you to the largest, 1,200 lbs, and a heavier specialty setup.
It's worth understanding why the percentage, not the raw tongue weight alone, drives the recommendation. A 700 lb tongue is a modest load behind a heavy three-quarter-ton truck but a serious one behind a light SUV, because it's the same weight landing on very different vehicles. Dividing tongue weight by the tow vehicle's GVWR captures that relationship, so the tool is really asking how much the trailer is leaning on your specific vehicle, not just how heavy the tongue is in isolation.
Worked Example: A 10,000 lb Tow Vehicle with a 1,200 lb Tongue Weight
Say your tow vehicle has a GVWR of 10,000 lbs and your loaded trailer puts 1,200 lbs on the hitch.
Find the percentage. 1,200 / 10,000 x 100 = 12%.
Read the recommendation. 12% falls in the 10% to 15% band, so a WDH is recommended. Your load is heavy enough on the tongue that distributing it across both axles will noticeably improve how the rig sits and steers.
Size it. Your tongue weight is 1,200 lbs, so the first standard size that meets or exceeds it is the 1,200 lb WDH. You'd buy a hitch rated for 1,200 lbs. If your tongue weight had been lighter, say 900 lbs, the tool would step you to the 1,000 lb size instead, the first rating at or above 900. Because that tongue weight also eats into your truck's capacity, it's worth checking the Payload Calculator, and the Weight Distribution Calculator shows how a WDH improves balance across your axles.
Tips and What to Watch
Size the hitch to your tongue weight, not your trailer weight. WDH ratings describe how much tongue weight they distribute. Buy the size that meets or exceeds your actual tongue weight, using the standard 600, 800, 1,000, or 1,200 lb ratings.
Get your tongue weight right first. The recommendation depends entirely on an accurate tongue weight. Calculate or measure it before you rely on the WDH result, since a wrong tongue figure gives a wrong hitch size.
A WDH does not raise your tow ratings. It improves how the load sits and how the rig handles, but it does not let you exceed your tow vehicle's or hitch's rated limits. Stay within those regardless of whether you run a WDH.
Higher percentages mean a WDH matters more. As your tongue percentage climbs past 15%, a WDH shifts from helpful to strongly advisable, because that much weight on the rear axle alone hurts steering and braking. Don't skip it on a heavy tongue.
Frequently Asked Questions
What does a WDH actually do?
A weight distribution hitch uses spring bars to transfer some of the trailer's tongue weight from your tow vehicle's rear axle onto its front axle and back toward the trailer's axles. That levels out the rig, so the truck doesn't squat in back or go light in front, which improves steering, braking, and stability.
Can I use a WDH if my tongue weight is under 10%?
You can, and some drivers do for a smoother ride, but the tool marks it as not strictly needed at that level because the tongue load is already light on the tow vehicle. It won't hurt to run one, as long as it's set up correctly for your actual tongue weight.
How do I know what size WDH to buy?
Match the hitch rating to your tongue weight. WDH systems come in 600, 800, 1,000, and 1,200 lb ratings, and you want the first size that meets or exceeds your tongue weight. The calculator picks that size for you once you enter your numbers.
Is a WDH a legal requirement?
It depends on where you are and your setup, since some jurisdictions and many vehicle manufacturers require or strongly recommend one above a certain tongue weight or trailer weight. Check your owner's manual and local rules, and treat the calculator's recommendation as a safety guide rather than a legal ruling.