{"summary":"US inflation for 2026-09: headline CPI 3.72%, core CPI 2.57%, core PCE 3.01% (2026-08) year over year. Over the last year food and energy accounted for 1.7 percentage points of the headline CPI rate.","source":{"name":"Helious","url":"https://helious.io/inflation","cite_as":"Helious, https://helious.io/inflation","attribution":"Please credit Helious and link the url above when you use this.","live":"This is live data. Request this endpoint at any time for the current numbers."},"data":{"as_of":"2026-10-21T14:25:46+00:00","latest_month":"2026-09","target":{"pct":2.0,"basis":"the yearly change in headline PCE, over the longer run"},"windows":{"yoy":"year over year","a3":"3-month annualised","a6":"6-month annualised","a1":"1-month annualised"},"measures":[{"key":"headline_cpi","name":"Headline CPI","group":"headline","what_it_is":"Everything a normal household buys: food, rent, fuel, haircuts.","yoy":3.72,"month":"2026-09","a3":4.56,"a6":3.67,"a1":8.07},{"key":"headline_pce","name":"Headline PCE","group":"headline","what_it_is":"A wider measure than CPI. This is the one the Fed's 2 percent goal is set on.","yoy":3.42,"month":"2026-08","a3":1.03,"a6":3.57,"a1":3.79},{"key":"core_cpi","name":"Core CPI","group":"core","what_it_is":"The same list with food and energy taken out, because those two jump around.","yoy":2.57,"month":"2026-09","a3":3.41,"a6":2.85,"a1":4.09},{"key":"core_pce","name":"Core PCE","group":"core","what_it_is":"The Fed's measure with food and energy taken out. The number it leans on most.","yoy":3.01,"month":"2026-08","a3":2.05,"a6":2.74,"a1":3.01},{"key":"supercore_cpi","name":"Supercore CPI","group":"core","what_it_is":"Services like haircuts and repairs, with housing and energy taken out. No official version exists, so we build it.","note":"a Helious calculation, not an official published measure: the weighted residual of two broader CPI aggregates, chained from 2012-03","yoy":2.89,"month":"2026-09","a3":4.53,"a6":3.31,"a1":4.12},{"key":"supercore_pce","name":"Supercore PCE","group":"core","what_it_is":"The same idea, measured on the Fed's wider list. This one is official.","yoy":3.46,"month":"2026-08","a3":2.11,"a6":3.19,"a1":4.56},{"key":"core_services_cpi","name":"Core services CPI","group":"core","what_it_is":"Everything people do for you rather than sell you, minus household energy.","yoy":3.16,"month":"2026-09","a3":3.76,"a6":3.56,"a1":4.51},{"key":"core_goods_cpi","name":"Core goods CPI","group":"core","what_it_is":"Physical things you buy, minus food and energy.","yoy":0.71,"month":"2026-09","a3":2.24,"a6":0.78,"a1":3.06},{"key":"services_less_rent","name":"CPI services less rent of shelter","group":"core","what_it_is":"Services with anything housing-related taken out.","yoy":3.22,"month":"2026-09","a3":3.26,"a6":3.16,"a1":3.73},{"key":"median_cpi","name":"Median CPI","group":"trim","what_it_is":"The one price change sitting exactly in the middle. One wild category cannot shift it.","yoy":2.61,"month":"2026-09","a3":2.68,"a6":3.12,"a1":2.81},{"key":"trimmed_cpi","name":"16% trimmed-mean CPI","group":"trim","what_it_is":"Crosses off the biggest risers and the biggest fallers, then averages the rest.","yoy":2.66,"month":"2026-09","a3":2.97,"a6":2.9,"a1":3.54},{"key":"trimmed_pce","name":"Trimmed-mean PCE","group":"trim","what_it_is":"The same idea, applied to the Fed's wider list.","note":"monthly change de-annualised from the published annual rate","yoy":2.19,"month":"2026-08","a3":1.77,"a6":2.35,"a1":1.92},{"key":"sticky_core_cpi","name":"Sticky-price core CPI","group":"trim","what_it_is":"Only the prices that change slowly, like insurance. These say more about what comes next.","yoy":2.78,"month":"2026-09","a3":3.36,"a6":3.06,"a1":3.49},{"key":"flexible_core_cpi","name":"Flexible-price core CPI","group":"trim","what_it_is":"Only the prices that change fast, like petrol. Jumpy by design.","yoy":1.48,"month":"2026-09","a3":3.91,"a6":1.81,"a1":7.92},{"key":"sticky_ex_shelter","name":"Sticky CPI less food, energy and shelter","group":"trim","what_it_is":"Close to supercore in spirit, and it goes back much further.","yoy":2.36,"month":"2026-09","a3":3.64,"a6":2.39,"a1":3.0},{"key":"shelter","name":"Shelter","group":"component","what_it_is":"Rent, plus what owners would pay to rent their own home.","yoy":3.22,"month":"2026-09","a3":3.22,"a6":3.73,"a1":4.79},{"key":"oer","name":"Owners' equivalent rent","group":"component","what_it_is":"What a homeowner would pay to rent their own place. The biggest single item, and the slowest to move.","yoy":3.28,"month":"2026-09","a3":3.23,"a6":3.79,"a1":4.28},{"key":"rent","name":"Rent","group":"component","what_it_is":"What renters actually pay, including people part-way through a lease.","yoy":2.78,"month":"2026-09","a3":2.74,"a6":3.52,"a1":3.0},{"key":"food_home","name":"Groceries","group":"component","what_it_is":"Groceries.","yoy":1.77,"month":"2026-09","a3":-0.42,"a6":1.67,"a1":-0.83},{"key":"food_away","name":"Eating out","group":"component","what_it_is":"Restaurants and takeaway.","yoy":3.46,"month":"2026-09","a3":3.22,"a6":3.15,"a1":2.79},{"key":"energy_comm","name":"Petrol and heating oil","group":"component","what_it_is":"Petrol and heating oil.","yoy":35.28,"month":"2026-09","a3":49.8,"a6":27.37,"a1":191.26},{"key":"energy_svc","name":"Gas and electricity","group":"component","what_it_is":"Electricity and piped gas.","yoy":4.57,"month":"2026-09","a3":-0.22,"a6":2.45,"a1":1.4},{"key":"gasoline","name":"Gasoline","group":"component","what_it_is":"The price most people notice first.","yoy":34.17,"month":"2026-09","a3":47.0,"a6":25.97,"a1":184.18},{"key":"electricity","name":"Electricity","group":"component","what_it_is":"Your electricity bill.","yoy":4.37,"month":"2026-09","a3":0.67,"a6":3.8,"a1":3.01},{"key":"new_vehicles","name":"New cars","group":"component","what_it_is":"The price of a brand new car.","yoy":0.61,"month":"2026-09","a3":2.13,"a6":0.17,"a1":2.41},{"key":"used_vehicles","name":"Second-hand cars","group":"component","what_it_is":"The item that drove the 2021 price spike.","yoy":-1.46,"month":"2026-09","a3":5.88,"a6":2.63,"a1":8.33},{"key":"apparel","name":"Clothes and shoes","group":"component","what_it_is":"Clothing, footwear and the like.","yoy":3.37,"month":"2026-09","a3":1.66,"a6":1.58,"a1":3.74},{"key":"medical_services","name":"Medical care","group":"component","what_it_is":"Doctors, dentists, hospitals and health insurance.","yoy":2.53,"month":"2026-09","a3":2.39,"a6":2.0,"a1":3.47},{"key":"transport_services","name":"Getting around","group":"component","what_it_is":"Car repairs, insurance, and fares.","yoy":2.77,"month":"2026-09","a3":5.42,"a6":1.45,"a1":7.25},{"key":"airline_fares","name":"Plane tickets","group":"component","what_it_is":"A tiny slice of spending that swings wildly.","yoy":22.45,"month":"2026-09","a3":27.1,"a6":26.2,"a1":14.83},{"key":"mv_insurance","name":"Car insurance","group":"component","what_it_is":"A small item that rose sharply for several years.","yoy":-4.98,"month":"2026-09","a3":-3.84,"a6":-8.73,"a1":0.78},{"key":"services_all","name":"All services","group":"component","what_it_is":"Everything people do for you rather than sell you.","yoy":3.23,"month":"2026-09","a3":3.55,"a6":3.5,"a1":4.35},{"key":"commodities_all","name":"All goods","group":"component","what_it_is":"Every physical thing you buy, food and fuel included.","yoy":4.58,"month":"2026-09","a3":6.31,"a6":4.04,"a1":15.03},{"key":"clev_exp1y","name":"Expected inflation, 1 year","group":"expect","what_it_is":"A forecast of what inflation will be over the next year.","yoy":2.98,"month":"2026-10","a3":2.98,"a6":2.98,"a1":2.98},{"key":"clev_exp10y","name":"Expected inflation, 10 years","group":"expect","what_it_is":"The same forecast, but looking ten years out.","yoy":2.73,"month":"2026-10","a3":2.73,"a6":2.73,"a1":2.73},{"key":"be_5y","name":"5-year breakeven","group":"expect","what_it_is":"What investors are betting inflation will average over the next five years.","yoy":2.36,"month":"2026-09","a3":2.36,"a6":2.36,"a1":2.36},{"key":"be_10y","name":"10-year breakeven","group":"expect","what_it_is":"The same bet, over ten years instead of five.","yoy":2.35,"month":"2026-09","a3":2.35,"a6":2.35,"a1":2.35},{"key":"be_5y5y","name":"5-year, 5-year forward","group":"expect","what_it_is":"What investors expect for the five years starting five years from now. The Fed watches this one.","yoy":2.34,"month":"2026-09","a3":2.34,"a6":2.34,"a1":2.34}],"driving":{"over_months":12,"month":"2026-09","parts":[{"part":"Housing","percentage_points":1.1433},{"part":"Services, not housing","percentage_points":0.7706},{"part":"Goods","percentage_points":0.1376},{"part":"Food and energy","percentage_points":1.6658}]}},"meta":{"tier":"keyless","history_days":1,"delay_sec":0,"docs":"https://helious.io/.well-known/openapi-public.json","fresh":false,"credits_charged":1,"credits_left":49,"market_data":"none over REST (market prices start on a free account key; the delayed /v1/stream snapshot is included on every plan)","upgrade_url":"https://helious.io/pricing","upgrade_note":"You are on the 1-day sample tier with no market prices and 50 credits a month shared by your network address. A free account key (no charge) gets 7 days, 100 credits a month of its own and every price board an hour behind; with a key, fresh=1 answers a call live for 5 credits. GET /v1/access has the steps to relay to your user.","as_of":"2026-10-21T14:25:46+00:00"}}