| Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Cash and cash equivalents | 31 | 40 | 113 | 289 | 436 | 439 | 546 | 410 | 276 | 293 |
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| Restricted cash | - | - | - | - | - | - | - | - | - | 57 |
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| Marketable Securities, Current | - | - | - | - | - | - | - | - | 152 | 190 |
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| Accounts Receivable, after Allowance for Credit Loss, Current | 19 | 27 | 37 | 39 | 42 | 16 | 27 | 46 | 42 | 77 |
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| Inventory | 5 | 2 | 3 | 5 | 1 | 0 | 1 | 5 | 5 | 6 |
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| Prepaid expenses | 5 | 4 | 4 | 5 | 8 | 12 | 13 | 11 | 14 | 21 |
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| Other receivables | - | 8 | 10 | 13 | 9 | 17 | 14 | 15 | 11 | 17 |
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| Income tax receivable | - | 5 | 7 | 7 | 1 | 5 | 4 | 5 | 3 | 3 |
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| Total current assets | 73 | 91 | 177 | 389 | 540 | 567 | 662 | 556 | 472 | 588 |
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| Long-term marketable securities | - | - | - | - | - | - | - | - | 51 | 66 |
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| Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | - | - | - | - | - | - | - | - | 78 | 76 |
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| Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization | - | - | - | - | - | - | 174 | 349 | 390 | 424 |
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| Right-of-use assets, net | - | - | - | - | 156 | 164 | 190 | 347 | 381 | 395 |
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| Intangible assets, net | 274 | 254 | 236 | 234 | 234 | 217 | 201 | 417 | 373 | 323 |
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| Goodwill | 177 | 177 | 177 | 200 | 228 | 228 | 229 | 703 | 718 | 721 |
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| Deferred income taxes | 117 | 410 | 408 | 415 | 412 | 511 | 539 | 455 | 504 | 470 |
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| Other assets, net | 2 | 8 | 12 | 2 | 2 | 2 | 2 | 4 | 4 | 7 |
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| Total assets | 699 | 1,001 | 1,092 | 1,353 | 1,717 | 1,850 | 2,016 | 2,855 | 2,970 | 3,070 |
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| Long-Term Debt, Current Maturities | 5 | 7 | 7 | 12 | 18 | 18 | 18 | 21 | 21 | 23 |
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| Accounts payable | 24 | 29 | 29 | 30 | 21 | 19 | 28 | 21 | 24 | 33 |
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| Accrued expenses | 14 | 19 | 19 | 32 | 32 | 22 | 52 | 67 | 66 | 68 |
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| Equipment deposits | - | - | - | - | - | - | - | 8 | 5 | 2 |
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| Deferred revenue, current | - | - | - | 23 | - | - | 28 | 54 | 60 | 62 |
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| Tax Benefit Arrangement Payable, Current | - | - | - | - | - | - | - | - | 41 | 56 |
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| Other current liabilities | 0 | 0 | 0 | 0 | 18 | 25 | 25 | 42 | 35 | 40 |
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| Total current liabilities | 66 | 83 | 112 | 131 | 145 | 112 | 177 | 245 | 251 | 282 |
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| Notes and Loans, Noncurrent | - | - | - | - | - | 1,676 | 1,665 | 1,978 | 1,963 | 2,148 |
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| Operating Lease, Liability, Noncurrent | - | - | - | - | 153 | 168 | 198 | 342 | 382 | 405 |
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| Deferred revenue, net of current portion | - | - | - | 26 | 34 | 33 | 33 | 33 | 32 | 32 |
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| Deferred tax liabilities | - | - | - | - | 1 | 1 | - | 1 | 2 | 1 |
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| Tax Benefit Arrangement Payable, Noncurrent | - | - | - | - | - | - | - | - | 454 | 411 |
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| Other liabilities | 0 | 5 | 4 | 1 | 3 | 3 | 3 | 4 | 5 | 4 |
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| Total noncurrent liabilities | 634 | 1,133 | 1,117 | 1,605 | 2,279 | 2,444 | 2,482 | 2,822 | 2,837 | 3,003 |
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| Class A common stock | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Class B common stock | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | - | - |
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| Accumulated other comprehensive (loss) income | -2 | -1 | -1 | 0 | 0 | 0 | 0 | -0 | 0 | -2 |
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| Additional paid in capital | 0 | 34 | 12 | 20 | 30 | 46 | 63 | 505 | 576 | 609 |
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| Accumulated deficit | -14 | -164 | -131 | -394 | -737 | -752 | -709 | -704 | -691 | -822 |
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| Total stockholders’ deficit attributable to Planet Fitness, Inc. | - | -131 | -119 | -375 | -706 | -706 | -643 | -199 | -116 | -215 |
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| Non-controlling interests | - | -84 | -17 | -8 | -1 | 0 | 3 | -13 | -3 | 0 |
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| Class A common stock | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Class B common stock | - | 0 | 0 | 0 | 0 | 0 | 0 | 0 | - | - |
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| Total stockholders’ deficit | - | -215 | -137 | -383 | -708 | -706 | -643 | -212 | -119 | -215 |
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| Total liabilities and stockholders’ deficit | 699 | 1,001 | 1,092 | 1,353 | 1,717 | 1,850 | 2,016 | 2,855 | 2,970 | 3,070 |
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