Men typically have 10 to 20 times more testosterone circulating in their blood than women. In numbers, the normal range for adult men falls between 264 and 916 ng/dL, while women typically measure between 15 and 70 ng/dL. That gap makes testosterone one of the most dramatically different hormones between the sexes, and it shapes everything from muscle mass to bone density.
The Numbers Side by Side
The average healthy man produces about 3.7 mg of testosterone per day. The average woman produces roughly 0.04 mg per day. That means men manufacture about 90 times more testosterone daily than women do. Yet the blood levels don’t reflect a 90-fold gap because the hormone is processed and cleared at different rates in each sex. What shows up on a blood test is closer to a 15- to 20-fold difference in circulating concentrations.
To put it concretely: a man in the middle of the normal range might measure around 500 to 600 ng/dL. A woman in the middle of her range might sit around 30 to 40 ng/dL. Even a man at the very bottom of normal (around 264 ng/dL) still carries several times more testosterone than a woman at the top of her range.
Why the Gap Opens at Puberty
Before puberty, boys and girls have nearly identical testosterone levels. There’s no meaningful sex difference in circulating testosterone or in physical performance metrics like speed and strength during childhood. That changes dramatically once puberty begins. The testes ramp up to produce about 30 times more testosterone than they did before puberty, and boys’ circulating levels climb to 15-fold or more above what girls or prepubertal children carry. This surge is what drives the development of a deeper voice, increased muscle mass, broader shoulders, and facial hair.
Girls also experience a modest rise in testosterone during puberty, produced by both the ovaries and the adrenal glands, but the increase is far smaller. By the end of adolescence, the full adult gap is established.
How Levels Change With Age
Men and women follow surprisingly different aging curves. In men, total testosterone stays fairly stable until around age 70, then begins an accelerating decline. The biologically active form of the hormone (the portion not bound to proteins in the blood) drops more steadily, declining in a linear pattern across the entire adult lifespan. Young men under 30 also experience the most dramatic daily swings, with morning levels running about 79 ng/dL higher than afternoon levels. That morning-to-evening dip shrinks in older men.
Women follow nearly the opposite pattern. Total testosterone declines progressively during the premenopausal years, then stabilizes or even ticks slightly upward after menopause. The biologically active portion, however, continues to drop steadily across the whole lifespan, similar to men. These shifts matter because even though women’s testosterone levels are much lower than men’s, relative changes within a woman’s own range can have noticeable effects on energy, mood, and sexual function.
What Testosterone Does in Women
It’s easy to think of testosterone as a “male hormone,” but it plays important roles in women’s health at those much lower concentrations. In postmenopausal women, testosterone contributes to maintaining bone density across the spine, hip, and total body. It supports lean body mass (the muscle and organ tissue that keeps metabolism running) and plays a direct role in sexual desire, arousal, satisfaction, and the ability to reach orgasm. Research on postmenopausal women found that adding testosterone to estrogen therapy produced significantly greater improvements in bone density at every skeletal site measured, along with meaningful gains in sexual function across multiple dimensions, compared to estrogen alone.
Testosterone also appears to preserve favorable body composition in women without disrupting the beneficial effects of estrogen on cholesterol. So while the absolute amount is small, it punches above its weight in terms of physiological impact.
Why Testing Conditions Matter
If you’re getting your testosterone checked, the number on your lab report can shift meaningfully depending on when and how the blood was drawn. Testosterone peaks between 5 and 8 a.m. and drops 10 to 25% by evening. Clinical guidelines call for a morning draw, ideally between 6 and 10 a.m., in a fasting state. A single low reading isn’t considered diagnostic on its own; levels should be confirmed on at least two separate mornings.
Reference ranges also vary between labs depending on the testing method used. The harmonized range of 264 to 916 ng/dL for men aged 19 to 39 applies specifically to labs using a standardized method certified by the CDC. Other labs may report different ranges, and the lower cutoff may not mean the same thing across assays. For women, there is no widely harmonized reference range, which makes interpreting borderline results trickier.
The Short Answer
Men carry roughly 10 to 20 times more testosterone in their blood than women at any given moment, with typical male levels ranging from about 264 to 916 ng/dL and typical female levels from 15 to 70 ng/dL. The gap emerges at puberty, persists throughout adulthood, and narrows only modestly with aging. Despite the large difference in absolute levels, testosterone is biologically active and important in both sexes.