Trailer Tongue Weight Calculator

10–15% target range from loaded trailer weight — compare a measured reading or estimate from cargo placement

Enter total loaded trailer weight, then a scale reading or a cargo-placement estimate. Results show the target tongue-weight band and flag too-low (sway) or too-high (rear overload). How to measure: guide. On-road symptoms: troubleshooting. WD vs standard hitch: comparison. Related safety tool: stopping distance calculator. Companion GCWR headroom check: towing capacity calculator. Automotive index: automotive calculators hub.

General towing guidance — not a substitute for your hitch, ball, and tow-vehicle weight ratings. Tongue weight that is too low is a real trailer-sway / loss-of-control risk at highway speed. Tongue weight that is too high can overload the hitch and the tow vehicle’s rear axle / payload. Always confirm hitch class, ball rating, rear GAWR, and payload capacity for your combination. This tool uses the common bumper-pull 10–15% band; it does not certify a setup as safe.
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How to Use This Trailer Tongue Weight Calculator

Enter the trailer’s total loaded weight. Choose measured mode if you already have a scale reading, or estimate mode if you are planning where cargo should sit. The results panel shows the 10–15% target range for that weight and flags whether your number is too low (sway risk), in band, or too high (rear overload risk).

Target TW = 10%–15% of loaded trailer weight
Estimate: TW ≈ empty TW + (Wfwd × dfwd − Waft × daft) / L

Measurement walkthrough: guide. On-road symptoms: troubleshooting. WD hitch thresholds: comparison. Related towing-safety physics: stopping distance calculator. Custom wheels on the tow vehicle: offset & backspacing calculator, offset guide, fitment troubleshooting, and spacers vs different-offset wheels.

What This Number Is (and Is Not)

Tongue weight is the downward force the coupler puts on the hitch ball. For conventional bumper-pull trailers, industry loading guides put that force at roughly one-tenth to fifteen percent of the trailer’s total loaded weight. Below the band, the trailer becomes a pendulum behind the hitch — classic sway. Above the band, the tow vehicle squats, the front axle unloads, and hitch / payload ratings get eaten.

Assumptions baked into every result

Bumper-pull percentage band of 10–15% of the loaded trailer weight you enter. Estimate mode treats the axle (or tandem group center) as the fulcrum and ignores spring windup, tire squat, and tongue jack height errors. Fifth-wheel / gooseneck pin weight is typically a higher percentage (often ~15–25%) — do not use this tool’s bumper-pull band for those.

Too-low tongue weight is not a “soft ride” preference.It is a documented sway / fishtail setup. If the trailer oscillates at highway speed, slow gradually without hard braking, straighten the wheel, and fix cargo placement before you continue. See troubleshooting.

When this tool is the wrong tool

Certifying a hitch class, reconstructing a crash, or sizing a fifth-wheel pin. For those you need manufacturer ratings and measured axle weights. Pair tongue-weight discipline with stopping-distance awareness on the braking calculator.

Need the measurement steps?Bathroom scale + pipe lever, commercial scale, and dedicated tongue scale.

Open Measurement Guide →

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Tongue Weight & Towing Safety Gear

The calculator tells you the 10–15% target range and whether a measured reading is too light (sway risk) or too heavy (rear-axle / hitch overload). A dedicated tongue scale replaces bathroom-scale guessing on heavier trailers; wheel chocks keep the trailer from rolling while you measure; a rated extinguisher belongs in any tow kit.

Trailer tongue weight scale

Sherline LM 2000 Trailer Tongue Weight Scale (2,000 lb)

Hydraulic tongue scale with a direct pounds gauge. Measure the loaded coupler on level ground, then compare the reading to the calculator’s 10–15% target band for your gross trailer weight.

View on Amazon →
Solid rubber wheel chocks

MaxxHaul 70472 Solid Rubber Wheel Chocks (2-Pack)

Chock the trailer wheels before you drop the coupler onto a scale or jack a tongue for cargo moves. A rolling trailer ruins the reading and is a crush hazard.

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Automotive fire extinguisher

Kidde Basic 110 Fire Extinguisher FA110G

Towing multiplies fire risk (brakes, bearings, electrical). Keep a rated extinguisher reachable in the tow vehicle — not buried behind cargo in the trailer.

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Trailer tongue weight calculator

Run the Tongue Weight Numbers

Target 10–15% band from loaded trailer weight. Compare a scale reading, or estimate from cargo placement ahead/behind the axle.

Open Tongue Weight Calculator →
Braking stopping distance calculator

Stopping Distance While Towing

Trailer sway and wrong tongue weight both stretch stopping distance. Physics estimate from speed, reaction time, and surface mu.

Open Stopping Distance Calculator →
Trip fuel cost calculator

Price the Tow Miles

Loaded towing kills mpg. Gallons, total cost, and cost per mile from distance, mpg, and pump price.

Open Trip Fuel Cost Calculator →

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Related Automotive Calculators & Guides

Cargo Securement Tiedown CalculatorTongue weight is where the load sits. Tiedowns are what keeps it there. Trailer Tongue Weight Calculator10–15% target range from loaded trailer weight. Compare a measured reading or estimate from cargo placement. Payload Capacity CalculatorGVWR minus curb, passengers, cargo, and tongue weight — available remaining with over-limit warning. How to Calculate Available PayloadGVWR, curb, tongue weight, worked example, and CAT-scale process. Payload Capacity vs Towing CapacityGVWR vs GCWR — both limits apply; one green light does not clear the other. How to Measure Trailer Tongue WeightWhy the percentage matters, bathroom-scale lever method, and how cargo placement moves the reading. Incorrect Tongue Weight While TowingSway / fishtail vs rear squat and light steering — how to fix by redistributing cargo. Weight Distribution vs Standard HitchWhen tongue weight and trailer weight push you past a plain ball mount into a WD hitch. Braking / Stopping Distance CalculatorTowing-safety cousin: reaction + braking distance from speed and surface friction. Towing Capacity CalculatorGCWR headroom method: leftover trailer budget after curb, passengers, and cargo. Compare to the advertised tow rating. Wheel Offset & Backspacing CalculatorConvert ET (mm) to backspacing (in) and back. Hub-to-inner-edge plus a fender vs frame flag. Wheel Offset & Backspacing GuideWhat ET and backspacing are, how to tape a used wheel, and how to pick a target before ordering. Wheel Offset TroubleshootingFender-lip rub vs strut/caliper rub — how to tell which envelope you ran out of. Wheel Spacers vs Different Offset WheelsCost, bearing load, stud engagement, hub-centric vs lug-centric — when each is the right call. Coolant Mix Ratio CalculatorConcentrate and distilled water for a target freeze/boil point — fresh fill or top-off. Coolant Mix Ratio GuideGlycol chemistry, refractometer vs hydrometer, and climate-driven ratios. Automotive Calculators HubTire size, gear RPM, horsepower & torque, stopping distance, trip fuel cost, tongue weight.

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