IST to CST Converter

Convert time between India Standard Time (IST) and Central Standard Time (CST)

India Standard Time (IST)

17:56:52
Nov 11, 2025
UTC

Central Standard Time (CST)

17:56:52
Nov 11, 2025
UTC

Time Difference

Central Standard Time (CST) is 0 hours ahead of India Standard Time (IST)

Select Date

Select Time

Quick Reference

ISTCST
07:3020:00
09:3022:00
11:3000:00
13:3002:00
15:3004:00
17:3006:00
19:3008:00
21:3010:00
23:3012:00
01:3014:00
03:3016:00
05:3018:00

Related Time Zone Conversions

EST to MST MST to EST EST to PST EST to PDT PST to EST EST to CST

About IST to CST Time Conversion

Converting time between India Standard Time (IST) and Central Standard Time (CST) is essential for coordinating between India and the Central United States. IST is UTC+5:30 (consistent year-round, no daylight saving time), while CST is UTC-6 (observed November to March). IST is 10.5 hours ahead of CST.

This conversion is crucial for Indian IT companies, business process outsourcing (BPO) firms, software development teams, and businesses coordinating between India and Central US offices. India Standard Time is unique with its 30-minute offset and does not observe daylight saving time, making it consistently ahead year-round. However, the US Central region observes daylight saving time, so the offset changes to 9.5 hours when CDT is active.

Common Use Cases for IST to CST Conversion

Business & Work

  • Scheduling calls between Indian IT companies and Central US clients
  • Coordinating software development teams across India and Central America
  • Managing business process outsourcing (BPO) operations
  • Planning conference calls for customer support and technical teams

Personal & Travel

  • Coordinating with family and friends in India
  • Planning travel between India and Central US regions
  • Scheduling virtual meetings with Indian relatives or business partners
  • Arranging online collaboration with India-based colleagues

Time Zone Information

India Standard Time (IST)

  • UTC Offset: UTC+5:30
  • IANA Timezone: Asia/Kolkata
  • Daylight Saving: No daylight saving time (consistent year-round)
  • Major Cities: New Delhi, Mumbai, Bangalore, Hyderabad, Chennai, Kolkata
  • Coverage: Entire India (single timezone covering entire nation)

Central Standard Time (CST)

  • UTC Offset: UTC-6
  • IANA Timezone: America/Chicago
  • Daylight Saving: Standard time (November to second Sunday in March)
  • Major Cities: Chicago, Houston, Dallas, San Antonio, Austin, New Orleans, Memphis
  • Coverage: Central United States and parts of Canada and Mexico (winter months)

Quick Reference: IST to CST

9:30 AM IST
11:00 PM CST (previous day)
1:00 PM IST
2:30 AM CST
6:00 PM IST
7:30 AM CST
9:00 PM IST
10:30 AM CST

Remember: IST is always 10.5 hours ahead of CST. When CST changes to CDT (daylight saving time), the difference becomes 9.5 hours.

Frequently Asked Questions

What is the time difference between IST and CST?

IST (India Standard Time) is UTC+5:30, while CST (Central Standard Time) is UTC-6, making IST 10.5 hours ahead of CST. India does not observe daylight saving time, so IST remains constant year-round. However, the US Central region observes daylight saving time, so when CST changes to CDT (UTC-5) from March to November, the difference becomes 9.5 hours.

Why does India use a 30-minute offset (UTC+5:30)?

India chose UTC+5:30 as its standard time to accommodate the country's geographic location and historical development. The 30-minute offset is unique among major nations. Unlike most countries, India uses a single timezone across the entire nation despite spanning 28 degrees of longitude, making it one of the largest countries with a unified timezone.

Does India observe daylight saving time?

No, India does not observe daylight saving time. IST (India Standard Time) remains constant at UTC+5:30 year-round. This differs from many Western countries that adjust their clocks seasonally. The Indian government has decided against implementing daylight saving time, keeping the timezone consistent throughout the year for simplicity and economic reasons.

What does the 30-minute offset mean for scheduling?

The 30-minute offset (UTC+5:30) means that half-hour differences appear in conversions to standard timezones. For example, 1:00 PM IST converts to 2:30 AM CST (not 2:00 AM). When scheduling meetings, you need to account for this 30-minute increment, which can make it challenging to find round-hour meeting times between India and Western countries.

How do I calculate IST to CST conversion manually?

To convert from IST to CST, subtract 10.5 hours from the IST time. For example: 3:00 PM IST - 10.5 hours = 4:30 AM CST. If the result is negative, add 24 hours and subtract 1 from the date. For example, 9:00 AM IST - 10.5 hours = -1.5 hours, which equals 10:30 PM CST the previous day.

What is the best time to schedule India-US Central meetings?

Finding a mutually convenient time between India and Central US is challenging due to the large time gap. Generally, early morning hours in the US Central region (6:00 AM - 9:00 AM CST) overlap with evening hours in India (4:30 PM - 7:30 PM IST). Alternatively, evening in India (8:00 PM - 11:00 PM IST) corresponds to early morning CST (9:30 AM - 12:30 PM). Consider rotating meeting times to share the inconvenience fairly.

Pro Tips

  • • The unique 30-minute offset of IST requires careful attention when scheduling. Half-hour differences are not unusual, so always double-check converted times.
  • • India's single unified timezone spans a large geographic area. Business hours in western India (Mumbai, Bangalore) may feel earlier than in eastern regions relative to the sun.
  • • When scheduling regular meetings between India and Central US, consider alternating meeting times or splitting into separate calls to accommodate the large time difference fairly.
  • • India does not observe daylight saving time, making IST consistent year-round. However, the US Central region does observe DST, so the offset changes from 10.5 to 9.5 hours depending on the season.
  • • Early morning in the US Central region (6:00-9:00 AM) is generally the best time for India-Central US meetings. This is evening time in India (4:30-7:30 PM), which is still during business hours.
  • • When working with Indian teams, be aware that their "business hours" are fixed (IST), while your local time changes with daylight saving time. Plan ahead for these shifts.

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Shuffle any list of items into random order. Perfect for randomizing presentations, playlists, or task orders with visual animation and undo functionality.
JSON Randomizer
Generate random JSON data for testing, API development, and mock data creation. Customize data types, structure depth, templates, and export formats for developers and testers.

Engineering

Voltage Divider Calculator
Calculate output voltage, resistor values, power dissipation, and current for voltage divider circuits used in electronics and engineering.
Resistor Color Code Calculator
Decode resistor color bands to determine resistance values, tolerance, and power ratings for 4, 5, and 6-band resistors with visual representation.
Capacitor Value Calculator
Convert capacitor marking codes to values in pF, nF, and µF. Support for 3-digit codes, tolerance letters, and reverse lookup from value to code.
Wire Gauge Converter
Convert between AWG, millimeters, inches, square mm, square inches, and circular mils. Complete AWG chart with current ratings and resistance values.
Wave Frequency Calculator
Calculate wave frequency, wavelength, and speed using f=v/λ. Support for electromagnetic waves, sound waves, and custom mediums with unit conversions.
Fourier Series Visualizer
Interactive tool for visualizing Fourier series decomposition with real-time coefficient calculation, animation, and function approximation for signal analysis.
Sampling & Nyquist Calculator
Calculate Nyquist rate, check sampling sufficiency, analyze aliasing, and compute oversampling ratios for signal processing applications.
Beam Deflection Calculator
Calculate maximum deflection for simply supported and cantilever beams with point loads or distributed loads. Includes structural engineering formulas and design guidelines.
Bolt Torque Calculator
Calculate proper tightening torque for bolts based on material grade, preload requirements, and friction coefficients. Includes safety checks and engineering formulas.
Gear Ratio Calculator
Free professional gear ratio calculator for mechanical engineering. Calculate speed reduction, torque multiplication, compound gear trains, and mechanical advantage with real-time formulas and step-by-step solutions.
Molar Mass Calculator
Calculate molar mass and analyze chemical formulas with detailed elemental breakdown. Supports complex formulas, hydrates, parentheses, and provides mass percentages for chemistry applications.
Ideal Gas Law Calculator
Calculate pressure, volume, temperature, or moles using the ideal gas law (PV = nRT). Free calculator with multiple units, step-by-step solutions, and educational content for chemistry and physics.
Op-Amp Calculator
Calculate operational amplifier circuit parameters for inverting, non-inverting, differential, and integrator/differentiator configurations. Include gain, input/output impedance, and bandwidth calculations.
Heat Transfer Calculator
Calculate heat transfer rates for conduction, convection, and radiation. Include thermal resistance, heat exchanger analysis, and cooling calculations for engineering applications.
Transformer Turns Calculator
Calculate transformer turns ratios, primary/secondary voltages, currents, and power relationships. Include step-up/step-down calculations, impedance transformation, and efficiency calculations.
Power Electronics Calculator
Design and analyze DC-DC converters (buck, boost, buck-boost), calculate switching frequencies, inductor/capacitor values, and efficiency for power supply design.
Motor RPM Calculation
Calculate motor rotational speed from Hall-effect sensors, encoders, tachometers, and back-EMF measurements. Includes filtering, calibration, and performance analysis for motor control applications.
KVAR Calculator
Calculate required reactive power (KVAR) for power factor correction, capacitor bank sizing, and energy savings analysis for electrical systems and industrial applications.
HP to kW Motor Converter
Convert between horsepower (HP) and kilowatts (kW) for mechanical, electrical, and metric motor ratings with efficiency and load adjustments for engineering applications.
mAh to Wh Converter
Convert battery capacity between milliamp-hours (mAh) and watt-hours (Wh). Calculate energy storage for batteries, power banks, and electronic devices.
kW to kWh Converter
Convert kilowatts (kW) to kilowatt-hours (kWh) and calculate energy consumption from power and time. Estimate electricity costs for appliances and devices.
kWh to Watts Converter
Convert kilowatt-hours (kWh) to watts and calculate average power consumption from energy and time. Understand device power ratings and energy usage patterns.

Screensaver

Black Screen
A free backlight bleed tester to check dead pixels, backlight bleeding. Test monitor, laptop, mobile screen or other display issues.
White Screen
Quickly detect dead pixels, screen flicker, or backlight bleed on any monitor with our advanced display testing tool.
Red Screen
Spot dead pixels, color uniformity issues, or backlight bleeding fast-ensure your screen quality with our pixel checker.
Green Screen
Instantly check for dead pixels, backlight bleed, or display defects to guarantee flawless screen performance.
Blue Screen
Test your monitor for dead pixels, backlight bleeding, and color inconsistencies in seconds with our display diagnostic tool.
Yellow Screen
Identify dead pixels, uneven backlighting, or screen defects easily-optimize your monitor's display quality now.
Purple Screen
Find and fix dead pixels, backlight bleeding, or display issues using our comprehensive screen testing solution.
Cyan Screen
Ensure perfect screen quality by detecting dead pixels, backlight bleed, and other monitor issues instantly.
Orange Screen
Diagnose dead pixels, backlight bleeding, or display problems quickly-improve your monitor's performance and viewing experience.
Pink Screen
Uncover dead pixels, backlight bleed, or screen defects fast with our user-friendly display testing tool.
Brown Screen
Verify your screen for dead pixels, backlight bleeding, or color issues to maintain top display performance.
Gray Screen
Easily detect dead pixels, backlight bleed, and other screen issues to ensure your display's optimal quality.
Lime Screen
Quickly identify and troubleshoot dead pixels, backlight bleeding, and display defects for a flawless viewing experience.
Time Screen
Display the local time on your screensaver, automatically adjusting to your current time zone for accurate, real-time clock display.
Date Screen
A screensaver that displays the current date and time. Real-time clock display on your desktop or device.
Clock Screen
Elegant clock screensaver displaying the current time with customizable styles, perfect for adding a sleek look to your screen.

Utilities

Webcam Tester
Quickly test your webcam and verify camera settings to ensure optimal video quality and proper device functionality.
Microphone Test
Test your microphone and verify settings to ensure clear audio quality and proper device performance for free.
Flashlight Tester
Test your flashlight and verify settings to ensure optimal lighting and proper device functionality for free.
Morse Code Translator
Free online Morse code generator. Convert text to Morse code, e.g.: SOS in morse code, and vice versa.
Cookie Manager
View, edit, and manage your browser cookies effortlessly to control privacy, enhance security, and customize your browsing experience.
Credit Card Number Validation
Validate credit card numbers using the Luhn algorithm to ensure they are valid and secure.
Online Tally Counter
Free online tally counter with multiple counters, labels, and total calculation. Perfect for counting, tracking, and tallying various items.
Spacebar Counter
Simple spacebar counter - press spacebar or click + button to count. Perfect for counting repetitions, events, or any activity.
Password Strength Tester
Test your password strength and learn how secure your password is. Get real-time feedback and tips to create stronger passwords.
Website Screenshot
Generate screenshots of websites by entering a URL, with options for different device viewports (mobile, tablet, desktop) and full-page captures.
Color Blindness Simulator
Simulate how colors appear to users with different types of color blindness to ensure designs are accessible to users with color vision deficiencies.
Weight Tracker
Track and compare weight progress for multiple users. Add, edit, and delete weight records with visual progress reports and user comparison.

Printable

Printable Calendar
Generate and download printable monthly calendars for any month and year. Perfect for planning, organizing, and printing.
January 2025 Calendar
Generate and download printable January 2025 Calendar. Perfect for planning, organizing, and printing.
February 2025 Calendar
Generate and download printable February 2025 Calendar. Perfect for planning, organizing, and printing.
March 2025 Calendar
Generate and download printable March 2025 Calendar. Perfect for planning, organizing, and printing.
April 2025 Calendar
Generate and download printable April 2025 Calendar. Perfect for planning, organizing, and printing.
May 2025 Calendar
Generate and download printable May 2025 Calendar. Perfect for planning, organizing, and printing.
June 2025 Calendar
Generate and download printable June 2025 Calendar. Perfect for planning, organizing, and printing.
July 2025 Calendar
Generate and download printable July 2025 Calendar. Perfect for planning, organizing, and printing.
August 2025 Calendar
Generate and download printable August 2025 Calendar. Perfect for planning, organizing, and printing.
September 2025 Calendar
Generate and download printable September 2025 Calendar. Perfect for planning, organizing, and printing.
October 2025 Calendar
Generate and download printable October 2025 Calendar. Perfect for planning, organizing, and printing.
November 2025 Calendar
Generate and download printable November 2025 Calendar. Perfect for planning, organizing, and printing.
December 2025 Calendar
Generate and download printable December 2025 Calendar. Perfect for planning, organizing, and printing.
January 2026 Calendar
Generate and download printable January 2026 Calendar. Perfect for planning, organizing, and printing.
February 2026 Calendar
Generate and download printable February 2026 Calendar. Perfect for planning, organizing, and printing.
March 2026 Calendar
Generate and download printable March 2026 Calendar. Perfect for planning, organizing, and printing.