Period Products Monthly Cost Calculator

The cost of menstrual products is driven less by unit price than by cycle frequency, which is why this calculation starts from cycle length rather than calendar months. Dividing 365.25 by cycle length gives periods per year: about 17.4 at a 21-day cycle, 13.0 at 28 days and 10.4 at 35 days, a spread of two-thirds between the extremes for identical per-period usage. Normal adult cycles run roughly 21 to 35 days and periods last 2 to 7 days, with typical consumption of 15 to 25 disposable items per cycle at unit prices between 0.15 and 0.35 dollars. Absorbency is standardized in the United States: the Food and Drug Administration requires tampons to be labeled by grams of fluid absorbed, with Light at 6 grams or under, Regular 6 to 9, Super 9 to 12, Super Plus 12 to 15 and Ultra 15 to 18. The reusable comparison is the model's largest lever. A silicone cup costs roughly 20 to 40 dollars and lasts several years, so amortized annual cost falls to a few dollars against 60 to 120 for disposables, breaking even inside the first year. Several omissions are worth flagging. The model ignores sales tax, which still applies in some jurisdictions, and bulk or subscription pricing that commonly cuts unit cost 20 to 30 percent. It assumes stable usage, whereas heavy menstrual bleeding, clinically defined as loss above about 80 mL per cycle, can double consumption. The lifetime projection assumes roughly 40 years of menstruation, from menarche near age 12 to menopause near 51, at constant prices.

Commercially manufactured disposable menstrual products are about a century old. Kimberly-Clark introduced Kotex in 1921, adapting Cellucotton, an absorbent wood-pulp material developed as a surgical dressing during the First World War and reportedly used as improvised pads by nurses. The tampon with an applicator was patented by Earle Haas, a Colorado physician, who filed in 1931; Gertrude Tendrich purchased the patent and began producing Tampax, which reached the market in 1936. A reusable rubber menstrual cup was patented by the American actress Leona Chalmers in 1937, though it found little commercial traction for decades. Adhesive-backed pads displaced belted designs around 1970, dramatically simplifying use. The most consequential turn came in 1980, when an epidemic of toxic shock syndrome was linked to high-absorbency tampons, most notably the Rely brand, which Procter and Gamble withdrew from the market that October. The episode led to warning requirements and, in 1990, to the FDA rule standardizing absorbency terminology in grams, the labeling still in force and the reason a Super is comparable across brands. Reusables returned in the 2000s as medical-grade silicone cups reached the mainstream market, followed by absorbent period underwear in the 2010s. Policy caught up more slowly: campaigns against sales tax on menstrual products led more than 20 US states to repeal it since 2016, and Scotland passed the Period Products (Free Provision) Act in 2020, becoming the first country to establish a legal right to free menstrual products.