Masterforce Boost 20V Cordless Circular Saw Review | 5415.1

Masterforce upgrades the brushless circular saw with the Boost pack

The Masterforce Boost 20V Cordless Circular Saw is not much different from its brushless predecessor. We’ve decided to dive deeper and see what’s new and noteworthy about this updated model.


  • Brushless Motor with Boost Upgrade
  • Gentle guard action
  • The base slides well on the material
  • Excellent performance for the price

The inconvenients

Masterforce Boost Cordless Circular Saw Performance

The Masterforce Boost Cordless Circular Saw uses its brushless motor to drive a 7-1 / 4 ″ blade. With a no-load speed of 4800 RPM, this saw cuts smoothly and the blade leaves a surprisingly nice finish for a stock blade. The action of the guard is also pleasant and fluid.

Masterforce Boost 20V Beauty Circular Saw

For more aggressive and faster cuts, you can feel the engine start to drop under a heavier load. It looks a lot like the Pro-level cordless circular saws from just a few years ago. It is perfectly capable of making the cut, even compound miter cuts are not a problem. It just won’t have the hot knife through buttery feel that today’s high end saws have. However, it doesn’t have the same high price tag either.

Masterforce Boost 20V Cordless Circular Saw Bevel Cut

The maximum cutting capacity at 90º is 2-7 / 16 ″ — just under 2-1 / 2 ″ while at 45º you can cut up to 1-13 / 16 ″. The bevel reaches a maximum of 56º and a folding plastic part allows you to stop at 45º. This handles the majority of common cuts, so I have no complaints on the capacity front.

Boost upgrade

The Boost upgrade for this saw is primarily an internal job. Instead of just using a brushless motor to improve performance, runtime and tool life, Boost completes the package with updated electronics and a smarter battery system.

When the tool detects a boost battery, it is able to draw in more power and give it better performance. Compared to the previous brushless model, you will notice similar performance with a standard battery and a little more confidence in the fit with a Boost pack.

Masterforce Boost Cordless Circular Saw Design Notes


Masterforce sticks with metal components for the base, blade cover and blade guard. Often times, high-value saws opt for plastic blade guards and I like that Masterforce avoids that temptation.

Masterforce Boost 20V Circular Saw Build Quality

On their brushed FlexPower model, the lever locks for bevel and depth were plastic rather than metal. These levers were a bit more flexible than I like best, so we’re happy to see that this updated version has all-metal levers.


There is nothing crazy about the overall design of this straight blade sidewinder. The two handles are aligned with each other and the secondary handle has sufficient circumference to achieve a secure grip if your hands are larger or if you are wearing gloves. A simple push with your thumb releases the trigger safety.

Height and weight

As a bare tool, the Masterforce Boost Cordless Brushless Circular Saw weighs 7.8 pounds and 8.8 pounds with a 2.5 Ah Boost battery. We didn’t have a 5.0Ah Boost battery for testing, but we would expect the weight to increase by about 1/2 pound with the higher capacity.

Masterforce Boost 20V Cordless Circular Saw Weight

Overall, they’ve managed to reduce the weight a bit compared to the FlexPower model, but it’s still on par with the Pro saws that come with the same type of metal construction.

Blade changes

Blade changes are pretty standard, although Masterforce adds a modern twist with its flat motor housing. It allows you to set the saw on the motor housing so that you can change it more easily.

Masterforce Boost 20V Cordless Circular Saw Flat Motor Box

Additional features

  • Electric brake
  • LED light has pre-illumination and afterglow
  • Heavy duty rafter hook

Masterforce Boost Cordless Circular Saw Price

The regular price for this saw is $ 159.99 as a bare tool, and at this time there are no kit options available. However, if you’re on the Menards mail-in rebate train, we’ve seen it as low as $ 142.39. The Boost upgrade costs just $ 10 more than the standard brushless circular saw.

There is also a 6 1/2 inch version available which also has the Boost upgrade. It costs $ 119.99 as a bare tool if you’re looking for something lighter and more compact.

The bottom line

The Masterforce Boost circular saw quietly sits in a favorable position without too much competition as a 7-1 / 4 ″ brushless model in the under $ 200 price bracket. While it doesn’t really “impress” us like some ultra-premium models do, it doesn’t disappoint us either. It has a solid design and a feature set to go with the performance we saw from the top Pro models just a few years ago.

Discover the entire Masterforce range by clicking here.

Masterforce Boost Cordless Circular Saw Specifications

  • Model: Masterforce 5415.1
  • Power Source: Masterforce Boost 20V
  • Maximum speed: 4,800 rpm
  • Blade size: 7-1 / 4
  • Bevel capacity: 56 °
  • Maximum cutting depth at 90 °: 2-7 / 16 ″
  • Maximum cutting depth at 45 °: 1-13 / 16 ″
  • Arbor size: 5/8 ″
  • Guarantee: 3 years
  • Price: $ 159.99
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