
Gear Ratio Speed Calc
Multi-Stage Drive Train Tool
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$4.99
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About
Designing a gear train and need to know the final output RPM and torque multiplier for single, dual, or triple stage setups? Enter driver and driven teeth counts, set your input RPM, and get instant results. Includes 8 common gear presets for fast selection on the shop floor.
FEATURES:
- Single, dual, and triple stage gear ratio calculations
- Calculate overall gear ratio, output RPM, and torque multiplier
- 8 common gear presets for quick selection
- Custom driver and driven teeth input for any gear combination
- Supports any input RPM value
- Clean, dark-themed interface for shop and field use
FORMULAS:
- Gear Ratio = Driven Teeth / Driver Teeth
- Output RPM = Input RPM / Overall Gear Ratio
- Torque Multiplier = Overall Gear Ratio
- Multi-stage: Overall Ratio = Stage 1 x Stage 2 x Stage 3
PRESETS INCLUDED:
12/48 (4:1), 15/45 (3:1), 18/36 (2:1), 20/40 (2:1), 16/64 (4:1), 24/72 (3:1), 20/60 (3:1), 14/56 (4:1)
Perfect for designing gear trains, verifying speed reductions, and calculating torque multiplication in mechanical power transmission systems.
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What's New in Gear Ratio Speed Calc
1.0.3
October 28, 2026
Optimized for iPhone Duo and iPad: on wide screens, inputs and results now sit side by side so you can see the answer change as you type. Built with the iOS 27 SDK.
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