Chicago
United States
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CST · UTC-6 3 hours difference
Sao Paulo
Brazil
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GMT-3 · UTC-3 Convert Chicago (CST) to Sao Paulo (GMT-3) Time — 3 hours apart
America/Chicago · CST · UTC-6 | America/Sao_Paulo · GMT-3 · UTC-3 · 3 hours difference · 850 cities · DST applies
24-Hour Overlap Timeline
✅ Overlap: 9:00 AM–3:00 PM in Chicago · 12:00 PM–6:00 PM in Sao Paulo (6h window)
⚠ Chicago observes daylight saving time — offset may vary by up to 1 hour seasonally
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UTC → | ||||||||||||||||||||||||
| 🇺🇸 Chicago UTC-6 | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p |
| 🇧🇷 Sao Paulo UTC-3 | 9p | 10p | 11p | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p |
Both working Working Off hours Sleeping Now
Key Facts: Chicago (CST) vs Sao Paulo (GMT-3)
Time Gap
3h
Sao Paulo ahead
May vary ±1h (DST)
DST Status
⏰ Chicago
Observes DST
✅ Sao Paulo: No DST
Cities in CST
250
Largest: Chicago
8,489,066 pop.
Overlap Window
6h window
9:00 AM – 3:00 PM (CST)
12:00 PM – 6:00 PM (GMT-3)
Find Cities in Chicago & Sao Paulo Timezones
The CST and GMT-3 timezones are separated by 3 hours. Chicago is the largest city in the America/Chicago zone and Sao Paulo is the largest in America/Sao_Paulo. Chicago observes daylight saving time — the difference may change by 1 hour seasonally. For scheduling between these regions, the key fact is: there are 6 hours of mutual business-hours overlap each day.
Best Times to Schedule Calls: Chicago (CST) ↔ Sao Paulo (GMT-3)
| Chicago (CST) | Sao Paulo (GMT-3) | Quality |
|---|---|---|
| 3:00 AM | 6:00 AM | ❌ |
| 4:00 AM | 7:00 AM | ❌ |
| 5:00 AM | 8:00 AM | ❌ |
| 6:00 AM | 9:00 AM | ❌ |
| 7:00 AM | 10:00 AM | ⚠️ |
| 8:00 AM | 11:00 AM | ⚠️ |
| 9:00 AM | 12:00 PM | ✅ |
| 10:00 AM | 1:00 PM | ✅ |
| 11:00 AM | 2:00 PM | ✅ |
| 12:00 PM | 3:00 PM | ✅ |
| 1:00 PM | 4:00 PM | ✅ |
| 2:00 PM | 5:00 PM | ✅ |
| 3:00 PM | 6:00 PM | ⚠️ |
| 4:00 PM | 7:00 PM | ⚠️ |
| 5:00 PM | 8:00 PM | ❌ |
| 6:00 PM | 9:00 PM | ❌ |
| 7:00 PM | 10:00 PM | ❌ |
| 8:00 PM | 11:00 PM | ❌ |
| 9:00 PM | 12:00 AM +1 day | ❌ |
Work hours defined as 09:00–18:00 local time. ✅ Both in work hours ⚠️ Borderline ❌ Outside work hours.
CST to GMT-3: Complete 24-Hour Time Conversion Table
| Chicago (CST) | Sao Paulo (GMT-3) | IST (UTC+5:30) |
|---|---|---|
| 12:00 AM | 3:00 AM | 11:30 AM |
| 1:00 AM | 4:00 AM | 12:30 PM |
| 2:00 AM | 5:00 AM | 1:30 PM |
| 3:00 AM | 6:00 AM | 2:30 PM |
| 4:00 AM | 7:00 AM | 3:30 PM |
| 5:00 AM | 8:00 AM | 4:30 PM |
| 6:00 AM | 9:00 AM | 5:30 PM |
| 7:00 AM | 10:00 AM | 6:30 PM |
| 8:00 AM | 11:00 AM | 7:30 PM |
| 9:00 AM | 12:00 PM | 8:30 PM |
| 10:00 AM | 1:00 PM | 9:30 PM |
| 11:00 AM | 2:00 PM | 10:30 PM |
| 12:00 PM | 3:00 PM | 11:30 PM |
| 1:00 PM | 4:00 PM | 12:30 AM |
| 2:00 PM | 5:00 PM | 1:30 AM |
| 3:00 PM | 6:00 PM | 2:30 AM |
| 4:00 PM | 7:00 PM | 3:30 AM |
| 5:00 PM | 8:00 PM | 4:30 AM |
| 6:00 PM | 9:00 PM | 5:30 AM |
| 7:00 PM | 10:00 PM | 6:30 AM |
| 8:00 PM | 11:00 PM | 7:30 AM |
| ← Date changes in Sao Paulo → | ||
| 9:00 PM | 12:00 AM +1 | 8:30 AM |
| 10:00 PM | 1:00 AM +1 | 9:30 AM |
| 11:00 PM | 2:00 AM +1 | 10:30 AM |
IST (India Standard Time, UTC+5:30) shown as reference for Indian users. +1/−1 indicates a different calendar day.
250 Cities in Chicago (CST) & 600 Cities in Sao Paulo (GMT-3) — Page 1 of 3
Chicago & 249 more — Chicago (CST, UTC-6)
- Chicago, US 8.5M
- Houston, US 6.0M
- Dallas, US 5.8M
- Minneapolis, US 2.9M
- St. Louis, US 2.1M
- San Antonio, US 2.1M
- Austin, US 1.9M
- Kansas City, US 1.7M
- Milwaukee, US 1.3M
- Nashville, US 1.2M
- Memphis, US 1.0M
- Oklahoma City, US 1.0M
- Fort Worth, US 941K
- New Orleans, US 919K
- Omaha, US 826K
McAllen, USBirmingham, USWinnipeg, CATulsa, USBaton Rouge, USReynosa, MXDes Moines, USHeroica Matamoros, MXWichita, USLittle Rock, USMadison, USDenton, USFayetteville, USPensacola, USArlington, USNuevo Laredo, MXHuntsville, USCorpus Christi, USJackson, USMobile, USSt. Paul, USLincoln, USSpringfield, USPlano, USLubbock, USDavenport, USShreveport, USRockford, USPeoria, USKilleen, USLaredo, USIrving, USRound Lake Beach, USMontgomery, USGarland, USAppleton, USGulfport, USLafayette, USGreen Bay, USFargo, USBrownsville, USClarksville, USCollege Station, USFrisco, USSioux Falls, USEvansville, USAmarillo, USGalveston, USMcKinney, USGrand Prairie, USWaco, USOverland Park, USCedar Rapids, USMurfreesboro, USAurora, USPanama City, USPiedras Negras, MXTuscaloosa, USOdessa, USCiudad Acuna, MXTopeka, USJoliet, USNaperville, USPasadena, USMesquite, USChampaign, USHouma, USBeaumont, USLake Charles, USOlathe, USMidland, USColumbia, USMetairie, USRacine, USBloomington, USCarrollton, USTyler, USIowa City, USNorman, USFort Smith, USLewisville, USAbilene, USPearland, USKenosha, USRound Rock, USTemple, USRochester, USIndependence, USDuluth, USRichardson, USMonroe, USThe Woodlands, USSt. Cloud, USBroken Arrow, USHarlingen, USMandeville, USLeague City, USPort Arthur, USElgin, USWaterloo, USSioux City, USLongview, USSugar Land, USEau Claire, USAuburn, USAllen, USLee's Summit, USEdinburg, USWichita Falls, USBowling Green, USCiudad Rio Bravo, MXSan Angelo, USBismarck, USNew Braunfels, USConroe, USLawrence, USEdmond, USSlidell, USAtascocita, USLa Crosse, USO'Fallon, USHoover, USLawton, USWaukegan, USJoplin, USSpringdale, USMission, USBryan, USFranklin, USDecatur, USBaytown, USBrooklyn Park, USCicero, USHattiesburg, USOwensboro, USFlorence, USPharr, USPlymouth, USJonesboro, USGeorgetown, USTexarkana, USFlower Mound, USAlton, USCedar Park, USHammond, USWoodbury, USSchaumburg, USEvanston, USSt. Joseph, USWausau, USAnniston, USArlington Heights, USOshkosh, USMansfield, USMissouri City, USJanesville, USSan Marcos, USDothan, USSherman, USBolingbrook, USAlexandria, USSheboygan, USLakeville, USRogers, USBlaine, USSt. Charles, USWaukesha, USAnkeny, USMaple Grove, USNorth Richland Hills, USConway, USWest Des Moines, USSpring Hill, USGrand Forks, USMichigan City, USGary, USValle Hermoso, MXDubuque, USShawnee, USEagan, USKankakee, USLeander, USSpring, USPalatine, USVictoria, US
Sao Paulo & 599 more — Sao Paulo (GMT-3, UTC-3)
- Sao Paulo, BR 23.1M
- Buenos Aires, AR 16.7M
- Rio de Janeiro, BR 12.6M
- Belo Horizonte, BR 5.3M
- Fortaleza, BR 4.2M
- Salvador, BR 2.4M
- Cordoba, AR 2.1M
- Curitiba, BR 1.8M
- Montevideo, UY 1.7M
- Recife, BR 1.5M
- Porto Alegre, BR 1.3M
- Guarulhos, BR 1.3M
- Belem, BR 1.3M
- Rosario, AR 1.3M
- Campinas, BR 1.2M
Goiania, BRSao Luis, BRMaceio, BRSantiago del Estero, ARLa Plata, ARSao Goncalo, BRTeresina, BRJoao Pessoa, BRSao Bernardo do Campo, BRNatal, BRSanto Andre, BRSorocaba, BRMar del Plata, ARAracaju, BROsasco, BRSan Miguel de Tucuman, ARJaboatao dos Guararapes, BRJuiz de Fora, BRSao Jose dos Campos, BRContagem, BRSalta, ARMacapa, BRCampos, BRRibeirao Preto, BRUberlandia, BRNiteroi, BRFeira de Santana, BRAnanindeua, BRAsuncion, PYVila Velha, BRSan Juan, ARLanus, ARMogi das Cruzes, BRLondrina, BRJoinvile, BRPiracicaba, BRCampina Grande, BRSantos, BRMaua, BRMaringa, BRSanta Fe, ARJundiai, BRDiadema, BRItaquaquecetuba, BRBauru, BRBlumenau, BRCaxias do Sul, BRSao Jose do Rio Preto, BRCaucaia, BRCorrientes, AROlinda, BRPraia Grande, BRCascavel, BRCanoas, BRCarapicuiba, BRFlorianopolis, BRPaulista, BRVitoria da Conquista, BRSantarem, BRRibeirao das Neves, BRCariacica, BRPelotas, BRVitoria, BRSan Salvador de Jujuy, ARSerra, BRTaubate, BRBarueri, BRGuaruja, BRCiudad del Este, PYMontes Claros, BRBetim, BRSao Vicente, BRPalmas, BRBahia Blanca, ARResistencia, ARNeuquen, ARAnapolis, BRSan Lorenzo, PYFranca, BRJuazeiro do Norte, BRFoz do Iguacu, BRPetropolis, BRPosadas, ARPonta Grossa, BRTaboao da Serra, BRImperatriz, BRParana, ARSumare, BRMossoro, BRItajai, BRLuque, PYQuilmes, ARIndaiatuba, BRSao Carlos, BRCaruaru, BRParnamirim, BRUberaba, BRLimeira, BRGovernador Valadares, BRMacae, BRSao Jose de Ribamar, BRMerlo, ARSanta Maria, BRAraraquara, BRVolta Redonda, BRAmericana, BRSete Lagoas, BRParamaribo, SRMarilia, BRJacarei, BRGonzalez Catan, ARArapiraca, BRMaracanau, BRFormosa, ARGravatai, BRDivinopolis, BRSuzano, BRMage, BRIpatinga, BRRio Verde, BRPresidente Prudente, BRItaborai, BRCapiata, PYViamao, BRChapeco, BRBanfield, ARItapevi, BRSanta Luzia, BRPetrolina, BRJose C. Paz, ARHortolandia, BRSan Rafael, ARCriciuma, BRSobral, BRSanto Agostinho, BRSao Jose dos Pinhais, BRRio Claro, BRComodoro Rivadavia, ARAracatuba, BRRio Cuarto, ARConcordia, ARSan Lorenzo, ARSao Leopoldo, BRNossa Senhora do Socorro, BRRio Grande, BRGodoy Cruz, ARIsidro Casanova, ARLas Heras, ARItabuna, BRFerraz de Vasconcelos, BRFernando de la Mora, PYSanta Barbara d'Oeste, BRColombo, BRJaragua do Sul, BRGuarapuava, BRLa Rioja, ARBerazategui, ARHurlingham, ARCachoeiro de Itapemirim, BRJuazeiro, BRLuziania, BRTimon, BRSao Jose, BRNova Friburgo, BRAraguaina, BRSan Luis, ARBarra Mansa, BRPasso Fundo, BRFrancisco Morato, BRMaraba, BRItapecerica da Serra, BRItu, BRLinhares, BRSao Caetano do Sul, BRLajes, BRPocos de Caldas, BRSan Fernando, ARParnaiba, BRCamacari, BRBraganca Paulista, BRPindamonhangaba, BRJose Maria Ezeiza, ARSan Nicolas de los Arroyos, ARPatos de Minas, BRCatamarca, AR
⚠️ Daylight Saving Time Affects This Pair
| Timezone | DST? | Standard | Daylight |
|---|---|---|---|
| America/Chicago | Yes | UTC-6 | UTC-5 |
| America/Sao_Paulo | No | UTC-3 | — |
During DST periods the time difference between these zones may be 2 hours instead of 3 hours. Always verify the current offset if scheduling calls near clock-change dates.