Readiness binder
Best for
Turning payload, tank, power, and service-loop math into a launch checklist
Use this when the calculator result affects several trip systems and needs to survive offline planning.
Preview the RV readiness binderTire load planning
RV tire load margin calculator
Turn loaded axle weights into per-tire reserve estimates before adding more batteries, tools, water, bikes, or solar hardware to the rig.
Quick tire read
Tire load margin looks usable
Trailer axle 2 is the tightest axle at 16% tire reserve after the imbalance buffer. The entered tire ratings have usable planning margin.
Lowest reserve
16%
Trailer axle 2 is the tightest axle.
Adjusted tire load
2,365 lb
Per tire after the imbalance buffer.
Measured axle load
8,500 lb
Loaded axle weight entered here.
This screens tire-capacity margin only. It does not set tire pressure, approve a towing setup, or replace tire load tables, RV placards, GAWR, GVWR, wheel ratings, tire age checks, or qualified tire guidance.
Start over
This calculator stores inputs locally in this browser. Clear saved inputs when stale values are getting in the way.
Tire load margin calculator
Check tire reserve from scale weights
Enter loaded axle weights and the tire capacity you are using from the sidewall or load table. The result estimates per-tire reserve after a side-to-side load imbalance buffer, but it does not choose inflation pressure.
Start with payload first
If you do not know whether the rig is already over cargo capacity, run payload before tire load margin.
Run the RV payload calculatorUse a real scale ticket
The cleanest number comes from the rig loaded for travel, with water and gear close to your real trip setup.
Read the used RV inspection checklistCheck the whole setup
Tires are one limit. Axles, wheels, hitch hardware, tow vehicle payload, and cargo placement still need their own checks.
Read the off-grid readiness checklistTool notes
How the tire-load calculator works
This output is a planning screen for loaded axle weights and tire capacity. It does not approve a towing setup, set inflation pressure, or replace manufacturer load tables.
Per-tire load
Each measured axle weight is divided by the number of tires on that axle. Duals still count as individual tires because each tire has its own load rating.
Imbalance buffer
The average per-tire load is multiplied by the side-to-side imbalance buffer so one heavier wheel position does not disappear inside a clean axle total.
Reserve margin
The adjusted per-tire load is compared with the entered tire rating. The calculator flags axles that fall below the reserve target or below zero margin.
Avoid these traps
Common mistakes before buying
Using dry brochure weight instead of a scale ticket
Tire margin is about the loaded rig. Water, tools, batteries, solar, food, passengers, bikes, and hitch hardware all need to be on board for the number to mean much.
Treating axle totals as wheel-position weights
A single axle weight is useful, but RVs often load one side harder because of slides, kitchens, tanks, cabinets, and battery placement.
Turning margin into pressure advice
This tool does not set tire pressure. Use the tire manufacturer's load-and-inflation table, the RV placard, and professional guidance when ratings or pressures are unclear.
Treat the calculator result as a tire-load screen, then verify tire pressure, tire age, wheel ratings, GAWR, GVWR, hitch setup, and manufacturer guidance before travel.See assumptions
Gear to compare after the math
Spec-checked products to compare after the math.
These handoffs match the calculator family, not a one-click prescription. Verify fit, specs, clearances, and install limits before buying.
Used RV inspection checklist
Best for
Checking whether the rig can carry the plan safely
A useful next step when payload, tire load, storage, or full-time setup math is tight.
Open the used RV inspection checklistFrequently asked
Questions RVers usually ask next.
Does this calculate the correct tire pressure?
No. It estimates load margin from scale weights and tire capacity. Tire pressure should come from the tire manufacturer's load-and-inflation table, RV placard, and the actual tire model you are running.
Should I use sidewall capacity or a load table value?
Use the capacity that matches your actual tire, size, load range, and inflation plan. If you are not sure, use the more conservative number and verify it with the manufacturer table before traveling.
What imbalance buffer should I use?
Ten percent is a practical starting point when you only have axle weights. If the rig has big slides, one-side tanks, or heavy batteries on one side, a higher buffer is safer until you get individual wheel-position weights.
Is this different from the payload calculator?
Yes. Payload checks whether the rig and tow vehicle have cargo margin from sticker and cargo assumptions. This calculator starts later in the process, after you have scale weights, and checks whether tire capacity still has reserve.