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Trailer Tongue Weight Calculator

Find the ideal tongue weight (10–15% of the loaded trailer, 12.5% sweet spot) or check a measured value for a too-light / ideal / too-heavy verdict.

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Vehicle Weight Distribution CalculatorSplit a vehicle's weight front/rear from a total and balance or from axle weights, get the CG position from the wheelbase and the left/right cross balance.Engine Compression Ratio CalculatorStatic compression ratio from bore, stroke and chamber volume, with gasket and piston corrections.Headlight Beam Distance CalculatorHow far your low beams reach from their aim angle and mounting height — and whether you outrun them.RV Loan CalculatorPayment, total cost and depreciation outlook for a motorhome, campervan, travel trailer, fifth wheel or pop-up, over terms up to twenty years. Trade-in and sales tax are handled separately from the down payment, and the tool marks the year the loan balance finally falls below the vehicle's likely value.Stopping Distance CalculatorReaction plus braking distance for any speed, road condition and driver alertness.Vehicle Towing Capacity CalculatorWork out your safe towing capacity from GCWR, curb weight, passengers and tongue weight, with a payload check, tongue-weight percentage and an OK/tight/over verdict.Car depreciation calculatorEstimate a car's residual value after several years.Car lease calculatorEstimate a monthly car lease payment from price, down payment and residual value.

Trailer Tongue Weight Calculator works straight from this page — free, instant, nothing to install. It covers 10–15% of the loaded trailer, 12.5% sweet spot — adjust any of them and the result follows immediately.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Trailer Tongue Weight Calculator?

Find the ideal tongue weight (10–15% of the loaded trailer, 12.5% sweet spot) or check a measured value for a too-light / ideal / too-heavy verdict.

What does it take into account?

It factors in 10–15% of the loaded trailer, 12.5% sweet spot. Change any of them and the output follows immediately.

When would I actually use this?

Deciding between two cars, or between keeping one and replacing it: fuel or charging, insurance, depreciation and what a kilometre really costs.

What is the most common mistake?

Comparing on fuel alone. Depreciation is usually the largest line in the first years and dwarfs the difference in consumption between two comparable cars.

How is Trailer Tongue Weight Calculator different from Vehicle Weight Distribution Calculator?

They sit next to each other but answer different questions. Vehicle Weight Distribution Calculator: split a vehicle's weight front/rear from a total and balance or from axle weights, get the CG position from the wheelbase and the left/right cross balance. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Engine Compression Ratio Calculator is the closest one after this: Static compression ratio from bore, stroke and chamber volume, with gasket and piston corrections.

What else is worth having open alongside it?

Headlight Beam Distance Calculator and RV Loan Calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

The arithmetic is exact for the prices and consumption you enter. Manufacturer figures are measured on a standard cycle and real-world consumption is routinely 10% to 25% higher.

Further reading

All guides →
ExplainerTongue Weight Is the Number That Stops a Trailer SwayingTowing limits tell you whether you may hitch up. Tongue weight tells you whether the combination will stay straight. It is set by where the trailer's centre of gravity sits relative to its axle, it moves faster than anyone expects, and the recommended bands are not the same on the two sides of the Atlantic.ExplainerWhere the Weight Sits Decides How the Car BehavesTwo axle weights and a wheelbase give you the exact position of a car's centre of gravity. From there the arithmetic keeps going: how much weight braking moves forward, why the rear axle is the one that runs out of grip, and why a load behind the rear axle takes weight off the front.ComparisonLeasing, Hire Purchase or Cash: the Five-Year Total, Not the Monthly PaymentThree ways to put the same car on the drive, priced over five years at the same interest rate. The monthly payments rank the options in exactly the reverse order of what they cost — and the gap turns out to be a single, computable number.ExplainerA Company Car Is Pay: What the Benefit in Kind Costs You in France, Germany and ItalyNobody negotiates a company car as a pay cut, but that is what the tax treatment makes it. Three countries value the same car by three completely different methods, one of them changed in 2025 in a way that nearly doubled the figure, and in all three an electric car is taxed at a fraction of the same vehicle with an engine.ExplainerHeadlight Aim and How Far You Can Actually SeeA dipped beam is aimed downward by a fraction of a degree, so its reach on flat road is a single division. Do it and you find that at motorway speed the beam is shorter than the stopping distance — and that a loaded boot can throw the whole calculation away.GuideMileage Allowances: the Official Scales in France, Spain and Italy, and What They Do Not CoverOne country gives you a formula that changes with the car's horsepower and the distance driven, one gives everybody the same figure per kilometre, and one publishes a table per model. All three are meant to cover the whole cost of running a car, and all three leave out things people assume are included.