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RV Tire Pressure Calculator — PSI from Axle Weight & Load Range

Find the correct tire pressure for your RV based on actual axle weights and tire load range

Recommended Pressure

35 PSI

Per Tire

1,250 lbs

Load

39%

Max

80 PSI

lbs
PSI
°F

Recommended Cold PSI

35 PSI

Weight/Tire

1,250 lbs

Max PSI

80

Max Capacity

3,195 lbs

Load %

39%

Always check pressure when tires are cold (before driving or 3+ hours after). Pressure increases ~1 PSI for every 10°F above 70°F baseline.

What You'll Need

AstroAI Digital Tire Pressure Gauge 150 PSI

AstroAI Digital Tire Pressure Gauge 150 PSI

$8-$124.5
View on Amazon
EPAuto 12V DC Portable Air Compressor Pump

EPAuto 12V DC Portable Air Compressor Pump

$30-$404.5
View on Amazon
3 Ton Low Profile Floor Jack Heavy Duty Steel

3 Ton Low Profile Floor Jack Heavy Duty Steel

$80-$904.8
View on Amazon
BIG RED Torin Steel Jack Stands 3 Ton Pair

BIG RED Torin Steel Jack Stands 3 Ton Pair

$30-$454.6
View on Amazon
CARTMAN 18" Universal 4-Way Lug Wrench

CARTMAN 18" Universal 4-Way Lug Wrench

$10-$184.5
View on Amazon
AstroAI Digital Tire Pressure Gauge 150 PSI

AstroAI Digital Tire Pressure Gauge 150 PSI

$8-$124.5
View on Amazon
EPAuto 12V DC Portable Air Compressor Pump

EPAuto 12V DC Portable Air Compressor Pump

$30-$404.5
View on Amazon
3 Ton Low Profile Floor Jack Heavy Duty Steel

3 Ton Low Profile Floor Jack Heavy Duty Steel

$80-$904.8
View on Amazon
BIG RED Torin Steel Jack Stands 3 Ton Pair

BIG RED Torin Steel Jack Stands 3 Ton Pair

$30-$454.6
View on Amazon
CARTMAN 18" Universal 4-Way Lug Wrench

CARTMAN 18" Universal 4-Way Lug Wrench

$10-$184.5
View on Amazon

As an Amazon Associate, we earn from qualifying purchases.

Frequently Asked Questions

Q

How do I determine the correct tire pressure for my RV?

Correct RV tire pressure is based on the actual weight on each tire, not the maximum PSI stamped on the sidewall. Weigh your RV fully loaded at a CAT scale to get individual axle weights, divide by the number of tires per axle, then consult the tire manufacturer’s load/inflation table.

  • Step 1: Weigh your RV loaded at a certified scale (CAT scale, RV rally, truck stop)
  • Step 2: Divide axle weight by number of tires on that axle to get weight per tire
  • Step 3: Look up the weight per tire in the manufacturer’s load/inflation table
  • Step 4: Round up to the next 5 PSI increment for a safety margin
  • Step 5: Adjust for ambient temperature — add/subtract ~1 PSI per 10°F from 70°F
Load RangeMax PSIMax Load/TireCommon RV Type
C (6-ply)50 PSI1,820 lbsPop-up campers
D (8-ply)65 PSI2,470 lbsSmall travel trailers
E (10-ply)80 PSI3,195 lbsTravel trailers, 5th wheels
G (14-ply)110 PSI4,540 lbsClass A motorhomes
Q

Should I inflate RV tires to the max PSI on the sidewall?

Not necessarily. The sidewall max PSI is the maximum safe pressure for that tire at its maximum load capacity. If your actual load per tire is less than the max capacity, you should inflate to the PSI that corresponds to your actual weight from the load/inflation table. Running at max PSI with a lighter load causes a harsh ride and uneven center tread wear.

  • Max sidewall PSI = maximum pressure for maximum load, not the recommended setting
  • Under-loading at max PSI causes center tread wear and a rough ride
  • Under-inflating causes sidewall flex, heat buildup, and potential blowout
  • Correct pressure matches the actual load per tire from the inflation table
  • A 10–15% margin above the table value provides a safety buffer for weight shifts
Q

How does temperature affect RV tire pressure?

Tire pressure changes approximately 1 PSI for every 10°F change in ambient temperature. A tire inflated to 80 PSI on a 70°F morning will read about 84 PSI at 110°F and 76 PSI at 30°F. Always set pressure when tires are cold (before driving or 3+ hours after stopping).

  • Rule of thumb: ~1 PSI per 10°F change from the baseline temperature
  • Summer heat can add 4–6 PSI above cold inflation — this is normal and expected
  • Winter cold can drop pressure 4–8 PSI — check more frequently in cold weather
  • Driving heats tires 10–20 PSI above cold pressure — never bleed hot tires down to cold spec
  • TPMS sensors help monitor real-time changes while driving
Ambient TempPSI Change from 70°F80 PSI Tire Reads
30°F-4 PSI76 PSI
50°F-2 PSI78 PSI
70°F0 PSI80 PSI
90°F+2 PSI82 PSI
110°F+4 PSI84 PSI
Q

How often should I replace RV tires?

RV tires should be replaced every 5–7 years regardless of tread depth, and ST (Special Trailer) tires every 3–5 years. UV exposure, ozone, and heat degrade tire rubber over time, causing sidewall cracking and increased blowout risk. Check the DOT date code on the sidewall to determine tire age.

  • ST tires: replace every 3–5 years — they degrade faster due to higher load stress
  • LT tires: replace every 5–7 years — more durable rubber compounds
  • DOT code format: last 4 digits = week + year (e.g., 2523 = week 25 of 2023)
  • UV-protective tire covers extend tire life 1–2 years when parked long-term
  • Annual inspection for sidewall cracking, bulges, and flat spots is essential
Q

What is the difference between ST and LT tires for RVs?

ST (Special Trailer) tires are designed specifically for trailers with stiffer sidewalls to prevent sway, while LT (Light Truck) tires are designed for driven axles with better heat dissipation and longer tread life. Many RV owners upgrade from ST to LT tires for improved durability and longer lifespan.

  • ST tires: stiffer sidewalls, better sway control, lower speed rating (65 mph max)
  • LT tires: better heat management, longer life, higher speed ratings
  • ST tires have 10–15% more load capacity than same-size LT tires at equal pressure
  • LT tires last 40,000–60,000 miles vs 15,000–30,000 for ST tires
  • When upgrading from ST to LT, verify the LT tire’s load capacity meets your axle weight

Example Calculations

1Travel Trailer with Load Range E Tires

Inputs

Tire TypeST (Special Trailer)
Load RangeE (10-ply)
Axle Weight5,000 lbs
Tires per Axle4

Result

Recommended PSI50 PSI
Weight per Tire1,250 lbs
Max Capacity3,195 lbs/tire
Load %39%

Weight per tire: 5,000 / 4 = 1,250 lbs. Load Range E base: 3,195 lbs at 80 PSI with 39.9 lbs/PSI rate. Required PSI: 80 - ((3,195 - 1,250) / 39.9) = 31.3 PSI, rounded up to 35 PSI. With industry rounding to nearest 5: 50 PSI provides a good safety margin.

25th Wheel with Load Range G Tires

Inputs

Tire TypeST (Special Trailer)
Load RangeG (14-ply)
Axle Weight8,000 lbs
Tires per Axle4

Result

Recommended PSI35 PSI
Weight per Tire2,000 lbs
Max Capacity4,540 lbs/tire
Load %44%

Weight per tire: 8,000 / 4 = 2,000 lbs. Load Range G base: 4,540 lbs at 110 PSI with 41.3 lbs/PSI rate. Required PSI: 110 - ((4,540 - 2,000) / 41.3) = 48.5 PSI, rounded to 50 PSI. With safety buffer: 65 PSI is comfortable.

Formulas Used

Weight per Tire

Weight per Tire = Axle Weight / Tires per Axle

Calculates the load carried by each individual tire on an axle. This is the starting point for determining correct inflation pressure.

Where:

Axle Weight= Total weight on one axle as measured at a certified scale (lbs)
Tires per Axle= Number of tires on that axle (2 for single, 4 for dual)

Required PSI from Load Table

PSI = Base PSI - ((Base Capacity - Weight per Tire) / lbs per PSI)

Interpolates the required inflation pressure from the tire’s load/inflation table based on actual weight per tire.

Where:

Base PSI= Maximum PSI for the tire’s load range
Base Capacity= Maximum load capacity at base PSI (from manufacturer table)
Weight per Tire= Actual weight carried by each tire
lbs per PSI= Load capacity change per PSI (from manufacturer’s load/inflation curve)

Temperature PSI Adjustment

Adjustment = (Ambient Temp - 70) / 10 × 1 PSI

Estimates how ambient temperature affects tire pressure relative to the 70°F baseline where most inflation tables are calibrated.

Where:

Ambient Temp= Current outside air temperature in °F
70= Baseline temperature assumed by most inflation tables (°F)
1 PSI= Approximate pressure change per 10°F temperature difference

RV Tire Pressure: Why Weight-Based Inflation Matters

Tire pressure is the single most important factor in RV tire safety, yet most RV owners set pressure incorrectly. The maximum PSI stamped on the sidewall is not a recommendation — it’s the maximum safe pressure at the tire’s maximum load capacity. If your RV is lighter than the tire’s maximum capacity (which it usually is), you should inflate to a lower pressure that matches your actual weight.

The correct approach starts at the scale. Weigh your RV fully loaded — with water, gear, passengers, and fuel — on a certified scale to get individual axle weights. Divide each axle weight by the number of tires on that axle to get weight per tire. Then consult the tire manufacturer’s load/inflation table to find the recommended PSI for that weight. Add 5–10 PSI as a safety margin to account for weight shifts while driving.

Temperature also affects tire pressure. For every 10°F change in ambient temperature, tire pressure changes roughly 1 PSI. A tire inflated to 80 PSI in a 70°F garage will read about 76 PSI on a 30°F winter morning. Always measure cold inflation pressure — before driving or at least 3 hours after stopping — and never bleed air from hot tires to reach the cold specification.

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Last Updated: Mar 25, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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