Toilet MaP Scores by Brand: Full Comparison

What Is a MaP Score and Why Does It Matter for Toilet Performance?

MaP testing is conducted by independent laboratories and is the most widely accepted benchmark for flush performance in North America. The test uses a simulated waste mixture of soybean paste and toilet paper. Toilets that score 1000g are considered top performers. Brands like TOTO, American Standard, and Kohler consistently achieve top marks. Lower scores often correlate with smaller trapways or less efficient flush engines. When comparing models, always check the MaP score alongside the gallons per flush (GPF) rating. WaterSense certification requires a MaP score of at least 350g, but most premium models exceed 800g.

Which Toilet Brand Has the Highest MaP Score?

TOTO’s Double Cyclone flush system uses two nozzles to create a powerful centrifugal rinse. This design, combined with a 2-1/8 inch trapway, allows the Drake II to clear the full 1000g test load while using only 1.28 GPF. American Standard’s Champion 4 uses a 2-3/8 inch trapway, the widest in the industry, which contributes to its 1000g score and excellent clog resistance. Kohler’s AquaPiston canister flush delivers a wide water flow that also achieves 1000g. Woodbridge matches TOTO’s score with a dual-flush system that uses 1.1 GPF for liquid waste and 1.28 GPF for solid waste. Gerber’s Viper uses a standard gravity flush and scores 800g, which is still well above the WaterSense minimum.

How Do MaP Scores Compare Between TOTO, Kohler, and American Standard?

In direct comparisons, TOTO’s Drake II and UltraMax II are the most popular models among homeowners and plumbers. The UltraMax II uses a skirted design that is easier to clean. American Standard’s Champion 4 is known for its oversized trapway, which reduces clogs. Kohler’s Highline Classic is a top seller for its quiet operation and reliable performance. All three brands offer WaterSense-certified models that use 1.28 GPF. When choosing between them, consider bowl shape, height, and design preferences. MaP scores alone do not distinguish them because all three achieve the maximum 1000g.

Do Budget Brands Like Woodbridge and Gerber Deliver Competitive MaP Scores?

Woodbridge’s T-0001 is a dual-flush toilet that uses a 3-inch flush valve and a glazed trapway to achieve its 1000g score. Owner reviews note that it flushes powerfully but can be louder than TOTO models. Gerber’s Viper uses a standard 2-inch trapway and a gravity flush. It scores 800g, which is sufficient for most households. Swiss Madison offers stylish designs with dual-flush functionality. These brands typically offer limited warranties compared to TOTO’s 5-year or Kohler’s 3-year coverage. For budget-conscious buyers, Woodbridge provides the best MaP score per dollar.

How to Use MaP Scores When Choosing a Toilet for Your Home

MaP scores are published on manufacturer websites and independent testing databases. The best flushing toilets typically combine a high MaP score with a wide trapway and efficient flush system. For example, the American Standard Champion 4 has a 2-3/8 inch trapway that resists clogs even with heavy use. The TOTO Drake II uses a 2-1/8 inch trapway but compensates with a powerful Double Cyclone rinse. Kohler’s Highline offers a 2-1/8 inch trapway and a quiet canister flush. Always match the toilet height to your household’s needs: comfort height (16-17 inches) is easier for adults, while standard height (15 inches) suits smaller bathrooms.