A Bidet Pays for Itself in 7 Months — Then Saves Forever

The Setup: Toilet Paper Is an Underrated Expense

Nobody thinks about toilet paper costs because each individual purchase feels trivial — $10 at the grocery store, $25 at Costco. But the Bureau of Labor Statistics Consumer Expenditure Survey puts average American household toilet paper spending at $182/year — a number that's held steady into 2026. For a family of four buying Charmin Ultra Soft or Cottonelle, that number climbs to $300-400.

You're also buying a product that's 100% designed to be flushed. There's no cheaper version of toilet paper — softer is more expensive, rougher is cheaper, but you're paying either way. The bidet changes the fundamental economics: instead of buying something to throw away, you use water (nearly free) to do 75%+ of the job, then use a small amount of TP to dry.

A bidet attachment — not a full bidet toilet seat, just the kind you install under your existing toilet seat in 15 minutes — costs $30 to $80 depending on features (cold water only vs. warm water via a T-adapter on your sink line). Our base case uses a $79 warm-water attachment, which is the sweet spot for most people: fast payoff, no electricity required.

The Math: 75% Reduction in TP Use

After installing a bidet, most users report using 1–3 sheets of toilet paper per visit just to pat dry — down from 10–15 sheets. That's roughly a 75–85% reduction. We'll use 75% to be conservative.

$15.17/month in TP × 25% remaining = $3.80/month post-bidet. Monthly savings: $11.37. Bidet water cost is negligible — about 1/8 gallon per use, roughly $1–2/year at US average water rates. Breakeven: $79 ÷ $11.22 = 7.0 months.

The 5-Year Picture: $594 Saved

After five years, you'll have spent about $316 total (the bidet + 5 years of minimal TP) vs. $910 in toilet paper alone. That's a $594 difference on something that requires zero ongoing effort after the initial 15-minute install.

For families of 4, multiply everything by roughly 2.5x. The savings get significant fast. And unlike most "smart" home purchases, a bidet attachment requires no subscription, no app, and no charging.

The Questions Everyone Has

"Is it weird?" For about 2 days. Then it becomes deeply normal and you start wondering why you ever did it the other way.

"Does it splash?" Good bidet attachments have adjustable pressure. Start at the lowest setting. Work up. You'll find your setting.

"Does the water use offset the TP savings?" No. A single toilet paper roll requires 37 gallons of water to produce. A bidet uses about 1/8 gallon per use. The bidet is dramatically more water-efficient, not less.

What We Recommend

The main tradeoffs are: cold water vs. warm water, and air-dry vs. pat-dry. Cold-water attachments are cheaper and simpler. Warm-water seats are much more comfortable but cost more and require an electrical outlet nearby.