Free tool · NYC Local Law 97
LL97 penalty calculator.
Enter your building's annual energy use to estimate carbon emissions, your emissions limit and the yearly penalty for both compliance periods. The form opens with a sample 100,000 sq ft office.
Use 12 months of utility bills. Values are converted to kBtu using standard factors (1 therm = 100 kBtu; #2 oil 138.5 kBtu/gal; #4 oil 146 kBtu/gal; steam 1,194 kBtu/Mlb).
Screening estimate only, single occupancy type. Uses 2024–2029 emission coefficients for both periods; DOB may set different coefficients for 2030 and later. Penalty: $268 per tCO₂e over the limit.
Emissions limits
LL97 limits by occupancy group.
Limits in kgCO₂e per square foot per year. Multiply by your floor area and divide by 1,000 for your annual limit in metric tons.
| Occupancy group | 2024–2029 | 2030–2034 |
|---|---|---|
| B · Office | 8.46 | 4.53 |
| R-2 · Multifamily | 6.75 | 4.07 |
| R-1 · Hotel | 9.87 | 5.26 |
| M · Retail | 11.81 | 4.03 |
| E · School | 7.58 | 3.44 |
| A · Assembly | 10.74 | 4.20 |
| F · Factory | 5.74 | 1.67 |
| S · Storage | 4.26 | 1.10 |
| I-1 · Institutional | 11.38 | 5.98 |
| Healthcare, H, I-2, I-3 | 23.81 | 11.93 |
FAQ
About this calculator.
How is my Local Law 97 emissions limit calculated?
Your annual limit is your gross floor area multiplied by the emissions intensity limit for your occupancy group. For mixed-use buildings, each occupancy group's floor area is multiplied by its own limit and the results are added together.
How are building emissions calculated under LL97?
Annual consumption of each energy source is multiplied by the greenhouse gas coefficient set in the law. For 2024–2029, grid electricity is 0.000288962 tCO₂e per kWh and natural gas is 0.00005311 tCO₂e per kBtu.
What is the LL97 penalty?
The penalty is $268 per metric ton of CO₂e above the building's annual limit, in addition to penalties for late or missing reports.
Is this calculator an official compliance calculation?
No. It is a screening estimate for a single occupancy type. Official reporting requires a registered design professional and the DOB's rules, including mixed-use limits, deductions and any adjustments that apply to your building.
Over the limit? We can show you how to close the gap.
Send us your building details or call an engineer directly. We reply within one business day with a recommended scope and fee.