Rahu Kaal Time Calculator

Work out rahu kaal time instantly with clear inputs, formula shown and shareable results.

About Rahu Kaal Time Calculator

The daylight period is divided into eight equal parts and Rahu Kaal occupies a fixed part for each weekday, the second part on Monday, seventh on Tuesday and so on. Because the divisions are fractions of actual daylight, Rahu Kaal is longer in summer and shifts with sunrise rather than sitting at a fixed clock time.

Formulas

Part length

each part = (sunset - sunrise) / 8

Window

start = sunrise + (part number - 1) x part length

Worked example

With the default values below, Rahu Kaal Time Calculator returns Length of Rahu Kaal of 93.75. Change any input above and every figure here is recalculated in your browser.

Inputs used

Sunrise as a decimal houraccepts 0–23.99: 6
Sunset as a decimal houraccepts 0–23.99: 18.5
Day of the weekone of Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday: Monday

Results

Length of Rahu Kaal: 93.75 min
Rahu Kaal begins at: 7.563 h
Rahu Kaal ends at: 9.125 h
Which eighth of the day it falls in: 2

Step by step

1Values used
2Part length
3Window
4Length of Rahu Kaal= 93.75 min
5Rahu Kaal begins at= 7.563 h
6Rahu Kaal ends at= 9.125 h
7Which eighth of the day it falls in= 2

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Rahu Kaal Time figure worked out?

each part = (sunset - sunrise) / 8. The daylight period is divided into eight equal parts and Rahu Kaal occupies a fixed part for each weekday, the second part on Monday, seventh on Tuesday and so on.

Why does this matter?

Because the divisions are fractions of actual daylight, Rahu Kaal is longer in summer and shifts with sunrise rather than sitting at a fixed clock time.

What do I need to enter?

Enter sunrise as a decimal hour, sunset as a decimal hour, day of the week. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.