How much you save doing gel nails at home is really a break-even question. The kit is a one-time cost; the salon is forever. Once you know your per-visit price and how often you go, the savings are easy to see.
The short answer
A ~$80 starter kit (LED lamp included) typically pays for itself in about 2 salon visits. Regular DIY users save roughly $1,000–$1,500 in the first year and roughly $1,200+ each year after, since ongoing supplies run closer to $90 a year.
Where the savings come from
At ~$60 a visit plus tip, a 3-week cadence means about 17 salon manicures a year - roughly $1,204. At home, the same cadence costs $170 in year one (kit plus supplies) and far less after. The biggest lever is the per-manicure cost: about $2–$5 at home versus ~$71 at the salon, because a single polish covers around 40 applications.
When the savings shrink
If you only get gel a few times a year, the kit takes longer to earn back and the gap narrows. Frequent breakage, wanting nail art, or struggling with application can also tip the balance back toward the salon. Run your own numbers in the calculator to see your real break-even.