Practitioner tool
lb/hr to Tons per Year Converter
Convert an hourly emission rate to tons per year at the operating hours you enter, or back from tons per year to lb/hr.
Short-term limits are in lb/hr; annual limits and major source comparisons are in tons per year. The conversion depends only on the hours of operation.
lb/hr to tons/yr calculator
8,760 is every hour of a 365-day year.
- Annual rate
- 4.38 tons/yr
- Daily (24 hr)
- 24 lb/day
Steps
- tons/yr = 1 × 8,760 ÷ 2,000 = 4.38
Questions engineers ask
Why 8,760 hours?
It is 24 hours × 365 days, the default for full-time operation. Use the hours an enforceable limit allows if one applies.
More converters: ppm to lb/hr, O2 correction, ppm to lb/MMBtu, lb/MMBtu to lb/hr, g/hp-hr to lb/hr, ppm to mg/m³, Wet to dry basis.
How this works
Formula
- tons/yr = lb/hr × hr/yr ÷ 2,000
- lb/hr = tons/yr × 2,000 ÷ hr/yr
Before you rely on the number
- A short ton is 2,000 lb. Some inventories ask for metric tonnes (2,204.62 lb).
- For potential to emit, use the hours your enforceable limits allow, or full-year operation if there is none.
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