--- title: "Understanding Gearbox Ratings: Input Torque vs. Output Torque" description: "Compare gearboxes \"apples to apples\" to ensure you choose the right components in this post from W.C. Branham" image: https://blog.wcbranham.com/hubfs/Blog%20Images/Gearbox%20Ratings%20(1).png --- [UPDATE !!! New Product Warranty Was 12-, Now 24-Months for Branham Trademark Manufactured Products. See Details... →](https://www.wcbranham.com/terms-and-conditions) [![W.C. Branham Logo](https://blog.wcbranham.com/hubfs/raw_assets/public/Wcbranham_April2024/images/wcb-logo.svg "W.C. Branham Logo")](https://www.wcbranham.com/) [Questions? 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20:1](https://www.wcbranham.com/air-oil-intensifiers/201-air-oil-intensifier) - [INT36 - 36:1](https://www.wcbranham.com/air-oil-intensifiers/361-air-oil-intensifier) - OVLBOOST® - [OVLBOOST™ 44mm 7.8:1](https://www.wcbranham.com/air-oil-intensifiers/ovlboost-44mm-71) - [Caliper Disc Brakes](https://www.wcbranham.com/brakes-caliper-disc) - - Caliper Disc Brakes - [Pneumatic Brakes](https://www.wcbranham.com/brakes-caliper-disc/pneumatic-brakes) - [Hydraulic Brakes](https://www.wcbranham.com/brakes-caliper-disc/hydraulic-brakes) - [Mechanical Brakes](https://www.wcbranham.com/brakes-caliper-disc/mechanical-brakes) - [Pneumatic Spring Applied Brakes](https://www.wcbranham.com/brakes-caliper-disc/pneumatic-spring-applied-brakes) - [Hydraulic Spring Applied Brakes](https://www.wcbranham.com/brakes-caliper-disc/hydraulic-spring-applied-brakes) - [Dual Function Brakes](https://www.wcbranham.com/brakes-caliper-disc/dual-function-mechanical-hydraulic) - Repair Kits and Parts - [Brake Repair Kits and Spare Parts](https://www.wcbranham.com/brakes-caliper-disc/repair-kits-and-parts) - 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[Right Angle Gearboxes](https://www.wcbranham.com/gearboxes-right-angle) - - Helical Gearboxes - [INCLUDE-A-SHAFT®](https://www.wcbranham.com/gearboxes-right-angle/include-a-shaft-series-10-mini) - [INSERT-A-SHAFT®](https://www.wcbranham.com/gearboxes-right-angle/include-a-shaft-series-10-mini) - [INSERT-A-SHAFT® Metric](https://www.wcbranham.com/gearboxes-right-angle/helical-gearboxes-metric) - [INSERT-A-SHAFT® CRL](https://www.wcbranham.com/gearboxes-right-angle/helical-gearboxes-crl) - [INSERT-A-SHAFT® CRL Washdown](https://www.wcbranham.com/gearboxes-right-angle/insert-a-shaft-crl-washdown-series) - [INSERT-A-SHAFT® Stainless Steel](https://www.wcbranham.com/gearboxes-right-angle/stainless-steel-gearboxes) - [GLIDE RIGHT™ Crossover](https://www.wcbranham.com/gearboxes-right-angle/helical-glide-right-crossover) - [MICROGEAR®](https://www.wcbranham.com/gearboxes-right-angle/helical-microgear) - - Other Gearboxes - [Spiral Bevel Right Angle Gearboxes, 1:1 or 2:1 Ratio](https://www.wcbranham.com/gearboxes-right-angle/spiral-bevel-gearboxes) - [Worm - BWG4™](https://www.wcbranham.com/gearboxes-right-angle/series-4-worm-gearboxes) - Repair Kits - [Helical Gearbox Repair Kits](https://www.wcbranham.com/gearboxes-right-angle/repair-kits) - [Custom Products](https://www.wcbranham.com/custom-products) [![W.C. Branham Logo](https://blog.wcbranham.com/hubfs/raw_assets/public/Wcbranham_April2024/images/sticky-wcb-logo.svg "W.C. Branham Logo")](https://www.wcbranham.com/) - [Air Over Oil Intensifiers](https://www.wcbranham.com/air-oil-intensifiers) - [Caliper Disc Brakes](https://www.wcbranham.com/brakes-caliper-disc) - [Pneumatic Linear Actuators](https://www.wcbranham.com/actuators-pneumatic) - [Right Angle Gearboxes](https://www.wcbranham.com/gearboxes-right-angle) - [Custom Products](https://www.wcbranham.com/gearboxes-right-angle) ![Understanding Gearbox Ratings: Input Torque vs. Output Torque](https://blog.wcbranham.com/hubfs/Blog%20Images/Gearbox%20Ratings%20(1).png) # Understanding Gearbox Ratings: Input Torque vs. Output Torque [W.C. Branham](https://blog.wcbranham.com/author/w-c-branham) 04/28/2026 [Right Angle Gearboxes](https://blog.wcbranham.com/topic/right-angle-gearboxes) ![Understanding Gearbox Ratings: Input Torque vs. Output Torque](https://blog.wcbranham.com/hubfs/Blog%20Images/Gearbox%20Ratings%20(1).png "Understanding Gearbox Ratings: Input Torque vs. Output Torque") Choosing industrial components requires an apples-to-apples comparison. Be aware of how torque ratings are determined —manufacturers don't all use the same rating standards. Let’s clear that up, so you can spec confidently. Let’s clear that up, so you can spec confidently. ## Input vs. output torque Input torque refers to the power going into the gearbox. Output torque is the usable power produced after the gears perform their function.  ## How does efficiency affect the relationship? Gearboxes are rated for two things, primarily:  - **RPM (revolutions per minute):** This is typically limited by the maximum rotational speed the gearbox can handle. - **Torque capability:** In[right-angle gearboxes](https://www.wcbranham.com/gearboxes-right-angle), input torque and output torque don't usually operate at a ratio of 1:1. And the type of gear impacts how much of a divide that is. For example, when the right-angle gearbox uses helical gears, the ratio changes because helical gears are only 60% efficient. So, 100 ft-lbs of input torque will only produce 60 ft-lbs of output torque.[Spiral bevel gears](https://www.wcbranham.com/gearboxes-right-angle/spiral-bevel-gearboxes), on the other hand, are about 97% efficient—so there is very little change between the input and output torque. ## Why are manufacturer ratings different? Ratings are often confusing because some brands use input torque while others—like Branham—use output torque. A "higher" rating on paper might actually offer the same capacity as a Branham gearbox. Using our helical gear example above, Company A might rate their gearbox at 100 ft-lbs (input torque), while our comparable Branham gearbox would show a rating of 60 ft-lbs (output torque).  Another factor often overlooked is the service level at which the maximum torque is measured.  If one gearbox calculates torque ratings at a higher maximum temperature than the exact same gearbox, the one at the higher temperature may appear to have a higher torque rating. But digging deeper, you may find that the higher temperatures of the first gearbox do not sustain constant use. In other words, one gearbox may be measured for intermittent use and another for continuous use. ## How to convert between ratings for accurate comparison? The functional style of the gears determines the gearbox’s efficiency. Once you understand the efficiency of different types of gears, then you can do the math: - **Amount of input torque (in ft lbs) X efficiency of the type of gears in your gearbox** ## Which rating is most important for your application? While output torque drives the application, **input torque** dictates your motor choice. The motor must provide the necessary RPM and torque without overpowering the gearbox. Before you choose, evaluate: - Input limitations for the device - Output required for the application Once you understand gearbox ratings and the[key selection factors involved](https://blog.wcbranham.com/hubfs/Advanced_Content/Gearbox%20selection%20checklist.pdf), easy math allows you to figure out what you need and how to compare options.  As always, Branham engineers are[happy to help](https://www.wcbranham.com/contact?_gl=1*11i0uv7*_gcl_aw*R0NMLjE3Njk3MjM1MDAuQ2owS0NRaUFwLXpMQmhEa0FSSXNBQmNZYzZ1QVZ4dlRQenZwaVF2SExzSnBXRlU2NE8wX2FLTThXVzhnMzlMVnRkbF92TzFFSzc1WVA5WWFBdF9pRUFMd193Y0I.*_gcl_au*NzExMTc4Mzc2LjE3Njc5NzYzNjIuMTkzNDQxMjI0MS4xNzcxNjM1MTc0LjE3NzE2MzUxNzQ.) you choose the most effective gearbox for your application. 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Branham](https://blog.wcbranham.com/author/w-c-branham) 09/27/2024 [Right Angle Gearboxes](https://blog.wcbranham.com/topic/right-angle-gearboxes) [Understanding Right-Angle Gearboxes: Different Types and Selection Tips](https://blog.wcbranham.com/selecting-a-right-angle-gearbox) --- ## Related Posts It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. [Right Angle Gearboxes](https://blog.wcbranham.com/topic/right-angle-gearboxes) [W.C. Branham](https://blog.wcbranham.com/author/w-c-branham) 22 September, 2026 #### [How to Determine Which Bevel Gear Design is Right for Your Application](https://blog.wcbranham.com/bevel-gear-design) When your machine needs to transfer power between shafts that intersect at odd angles, standard… [Read More](https://blog.wcbranham.com/bevel-gear-design) [Caliper Disc Brakes](https://blog.wcbranham.com/topic/caliper-disc-brakes), [Right Angle Gearboxes](https://blog.wcbranham.com/topic/right-angle-gearboxes) [W.C. Branham](https://blog.wcbranham.com/author/w-c-branham) 28 July, 2026 #### [How W.C. Branham Supports University Engineering Programs](https://blog.wcbranham.com/wcbranham-university-engineering-partnerships) At W.C. Branham, one of our core values is “We encourage those who desire to learn.” For the… [Read More](https://blog.wcbranham.com/wcbranham-university-engineering-partnerships) [Right Angle Gearboxes](https://blog.wcbranham.com/topic/right-angle-gearboxes) [W.C. Branham](https://blog.wcbranham.com/author/w-c-branham) 24 February, 2026 #### [MICROGEAR® Small Gearbox FAQ: Compact Power Transmission Solutions](https://blog.wcbranham.com/microgear-small-gearbox-faq-compact-power-transmission-solutions) Model Selection & Configuration Branham’s MICROGEAR® is a right-angle, hollow core, helical… [Read More](https://blog.wcbranham.com/microgear-small-gearbox-faq-compact-power-transmission-solutions) ![W.C. Branham Logo](https://blog.wcbranham.com/hubfs/raw_assets/public/Wcbranham_April2024/images/wcb-logo-footer.svg "W.C. 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