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Tongue Weight Calculator

2026-09-27 6 min

Hitch tongue load from trailer weight and tongue percentage.

Tongue Weight
600 lb
Axle Load
4400 lb
Trailer minus tongue

Calculator

Loaded Trailer Weight(lb)
lb
Tongue Percentage(%) Help
%

Target 10-15% bumper pull

Results update live as you type

Live statistics

Tongue Weight

600 lb

Axle Load

4400 lb

Trailer minus tongue

Results

Optimal

Tongue Weight

600lb

Axle Load

4400lb

Trailer minus tongue

Planning estimate from standard automotive formulas. Validate with dyno, timeslip or datalog data when precision matters.

Visualizations

Results overview

600Tongue Weight
4,400Axle Load

Tongue Weight vs. Loaded Trailer Weight

Tongue Weight

600lb
02,000

Formula

Scales loaded trailer weight by the balance percentage that keeps the trailer tracking straight.

Tongue = trailer weight x tongue%

Alternative Form

Bumper-pull target 10-15%; fifth-wheel/gooseneck 15-25%

Variables

SymbolNameUnitDescription
t%Tongue share%Balance point of the load

Explanation

Too little tongue sways; too much overloads the truck rear and unloads steering — the 10-15% window is the stability sweet spot.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Record the inputs.

Loaded Trailer Weight:5000 lb
Tongue Percentage:12 %
Result: 2 inputs ready
Step 2

Apply the formula.

Tongue = trailer weight x tongue%
Result: Primary result = 600 lb
Step 3

Read every derived output.

Tongue Weight:600 lb
Axle Load:4400 lb
Result: Tongue Weight = 600 lb
Final Answer
600

Worked Examples

See how the calculator works with different scenarios.

Scenario

Travel trailer loaded for a trip.

Inputs

Trailer:5,000 lb
Tongue:12%

Calculation

600 lb on the hitch; 4,400 on the axles

Result

600-lb tongue weight.

Interpretation

Verify the hitch (class III+) and truck payload absorb it.

Understanding Your Result

Your Result: Tongue Weight: 600 lb

Typical range: Bumper pull 10-15%; fifth/goose 15-25%. Under 10%: sway risk.

What This Means

Downforce the trailer puts on your hitch ball.

Why It Matters

Sets sway stability and spends truck payload — the two numbers that make or break towing.

Professional Interpretation

Treat the primary result as a planning estimate, then validate on a dyno, at the track, or with logged sensor data. If measured numbers disagree by more than ~10%, re-check inputs (units are the usual culprit) before changing parts.

Recommendations

  • •Double-check units on every input before trusting the result
  • •Compare against the worked example below to sanity-check magnitude
  • •Validate with measured data (dyno, timeslip, datalog) when it matters

Learn — fuel economy, deeply

Tongue weight is trailer balance expressed as hitch load.

1 · Where the gallon goes (energy path)

Engine heat

60–70% lost

Coolant + exhaust carry most energy away. Hybrids recover some via Atkinson cycle + regen.

Driveline

5–15% lost

Transmission, differential, accessories. CVTs and 8–10 speed autos lose less.

Aero drag

∝ v²

Doubles from 55→78 mph. Roof boxes hurt more than trunks.

Rolling + brakes

10–20%

Tires, weight, stops. Regen braking (hybrid/EV) reclaims city braking energy.

4 · Measure like a pro (the 3-tank protocol)

  1. Fill to first click at the same pump, record the odometer (Tank 0).
  2. Drive normally for 2–3 tanks; always refill to first click at the same pump.
  3. MPG = total miles ÷ total gallons across all tanks — averaging kills pump-click noise.
  4. Cross-check with the trip computer; a persistent >10% gap means the computer needs calibration — or the car needs service.
  5. Log with an OBD-II dongle for per-trip MPG if you want to isolate commute vs. highway behavior.

Practical Tips

  • •Load 60% of cargo weight ahead of the axles
  • •Re-weigh after big packing changes
  • •Water tank location swings tongue hundreds of pounds

Common Mistakes

Mixing units (inches with mm, psi with kPa)
Convert every input to the unit shown on its field before calculating.
Trusting a single output blindly
Cross-check with the worked example and, when it matters, a dyno or datalog.

Assumptions

This calculator makes the following assumptions to provide estimates:

Steady-state model: Formulas assume stabilized conditions; transients, heat soak and traction limits are excluded.
Standard factors: Empirical constants (BSFC, VE, drivetrain loss) use typical values — your combination may differ.

Limitations

Be aware of these limitations when using this calculator:

Estimate, not measurement: Predictions carry real-world scatter of roughly ±5–15% depending on the model.
No transient effects: Shift time, wheelspin, spool lag and heat soak are not modeled here.

Frequently Asked Questions

Answers to common questions about this calculator.

What happens with too little tongue weight?
Trailer sway — the leading cause of towing accidents. Shift cargo forward of the axles to reach 10%+.
How do I measure tongue weight?
Bathroom scale with a lever adapter for light trailers; purpose scales or CAT-scale axle math for heavy ones.

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Related Guides

Deepen your understanding with these educational resources.

Glossary

Technical terms used in mortgage calculations explained in plain language.

MPG
Miles per gallon. Distance travelled per gallon of fuel; higher is better. US gallon = 3.785 L.
L/100 km
Litres consumed per 100 kilometres; lower is better. Standard metric efficiency unit.
MPGe
Miles per gallon-equivalent. EV metric: miles travelled on 33.7 kWh (energy of 1 gal of gasoline).
CAFE
Corporate Average Fuel Economy — US fleet-average efficiency standard enforced by NHTSA.
Rolling resistance
Energy lost deforming tires as they roll. Low-pressure or wide tires raise it.
Aerodynamic drag
Air resistance growing with the square of speed — why highway MPG falls fast above 60 mph.
Hypermiling
Driving techniques (coasting, steady speed, anticipation) that maximise real-world MPG.
OBD-II
On-board diagnostics port. Scanners and dongles read live MPG, fuel trim and fault codes.

Authoritative References

Trusted sources and standards referenced by this calculator.

Applicable Standards

EPA Fuel Economy Testing (40 CFR Part 600)CAFE — Corporate Average Fuel Economy Standards (NHTSA)WLTP — Worldwide Harmonised Light Vehicle Test ProcedureSAE J1321 / J1711 — Fuel consumption test proceduresISO 2575 — Road vehicles symbols & efficiency markings

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