Transport & Manufacturing
Car Gear Ratio, Tire Diameter & Final Drive RPM Speed Sizer
Calculate car gear ratio, tire diameter & final drive rpm speed using the stated engineering or scientific relationship and adjustable field inputs.
Preparing your result…
What this calculator does
Calculates Car Gear Ratio, Tire Diameter & Final Drive RPM Speed Sizer using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Speed = RPM × tire circumference ÷ (gear × final drive)
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • No-slip vehicle speed m/s=engine RPM×π×effective rolling diameter(m)/[60×transmission ratio×final-drive ratio]. Multiply by3.6 for km/h.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Derived drivetrain kinematics. Define gear ratios as input:output reduction and use loaded rolling circumference/revolutions per distance when available. Tire growth/slip and torque-converter/clutch slip are excluded. Require positive diameter and ratios; a power-limited maximum speed cannot be determined from gearing alone.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Engine RPM (rpm) | Tire diameter (in) | Transmission gear ratio | Road speed |
|---|---|---|---|---|
| Worked example | 3,000 | 26 | 1 | 65.366 mph |
| Half the amounts | 1,500 | 13 | 0.5 | 65.1824 mph |
| Double the amounts | 6,000 | 52 | 2 | 77.3498 mph |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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