Litres consumed per 100 kilometres; lower is better. Standard metric efficiency unit.

Energy lost deforming tires as they roll. Low-pressure or wide tires raise it.

Automotive Calculators

Winch Gear Ratio Calculator

2026-09-27 6 min

Gear reduction and drum torque multiplication from motor and gear tooth counts.

Gear Ratio: 15.00 :1
Drum Torque Multiplier: 15.00 x; Line pull scales with ratio

Calculator

Motor Pinion Teeth(T)

Drum Gear Teeth(T)

Results update live as you type

Live statistics

Gear Ratio

15.00 :1

Drum Torque Multiplier

15.00 x

Line pull scales with ratio

Results

Optimal

Gear Ratio

15.00:1

Drum Torque Multiplier

15.00x

Line pull scales with ratio

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

Visualizations

Results overview

15Gear Ratio

15Drum Torque Multiplier

Gear Ratio vs. Motor Pinion Teeth

Gear Ratio

15:1

050

Formula

Single-stage reduction math: tooth ratio sets both the mechanical advantage and the speed penalty.

Ratio = gear teeth / motor teeth; drum torque multiplies by the ratio

Alternative Form

Line speed divides by the same ratio — torque and speed trade off

Variables

Symbol	Name	Unit	Description
N	Tooth counts	T	Pinion vs drum gear teeth
R	Reduction ratio	:1	Torque xR, speed /R

Explanation

A 15:1 box turns 15 motor revolutions into 1 drum revolution with ~15x the torque.

Step-by-Step Calculation

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

Step 1

Record the inputs.

Motor Pinion Teeth:12 T

Drum Gear Teeth:180 T

Result: 2 inputs ready

Step 2

Apply the formula.

Ratio = gear teeth / motor teeth; drum torque multiplies by the ratio

Result: Primary result = 15.00 :1

Step 3

Read every derived output.

Gear Ratio:15.00 :1

Drum Torque Multiplier:15.00 x

Result: Gear Ratio = 15.00 :1

Final Answer

15.00

Worked Examples

See how the calculator works with different scenarios.

Scenario

Checking a planetary rebuild spec.

Inputs

Pinion:12 T

Gear:180 T

Calculation

Ratio = 180 / 12 = 15.00:1

Result

15x drum torque multiplication.

Interpretation

Line pull rises 15x over direct drive; speed drops 15x.

Understanding Your Result

Your Result: Gear Ratio: 15.00 :1

Typical range: Electric winches 130:1-360:1 overall (multi-stage); single stage 4:1-20:1.

What This Means

How many motor turns it takes to spin the drum once.

Why It Matters

Higher reduction means stronger slow pulls; lower means faster light pulls.

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

Winch gearing trades motor speed for drum torque.

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)

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

Practical Tips

•Compare overall ratios, not single stages
•Higher ratio pulls stronger but slower
•Planetary stages multiply — 3x3x3 = 27:1

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.

Is a higher gear ratio better?

For pull strength yes, for speed no — ratio trades speed for torque one-for-one.

Why are winch ratios so high?

Small 12-V motors spin fast with little torque; 150:1+ gearing converts that into tons of slow line pull.

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Related Guides

Deepen your understanding with these educational resources.

Automotive Guides

Build planning, measurement protocol and validation how-tos

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.

EPA — FuelEconomy.gov DOE — Fuel-Efficient Driving Tips NHTSA — Driving Safety & Efficiency SAE International — Fuel Economy Standards Consumer Reports — MPG Truth IRS — Standard Mileage Rates

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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Page Information

Last Updated:

2026-09-27

Version:

2.0.0

References:

License:

Free to use for educational and professional purposes.