(17.875 9.125)

# Santoor String Calculator

Modern Indian santoors have 31 sets of strings and can be tuned a variety of ways. If they aren't strung right for the way it's being tuned strings may break or put undue stress on the instrument. This calculator lets you figure out what strings should be used where and warns you if you are going to run into problems.

Graphs showing the tension required to produce a range of notes for several string diameters are also included at the bottom of this page, showing the point at which they will break.

• Bridges are arranged along two lines — left and right
• Bridges are equally spaced vertically and interlaced
• Strings on each bridge are tuned to the same note except for chikari bridges.
• Notes for chikari bridges are entered with space separation (e.g. 'Sa Ga Pa')
• Notes are 2 character Hindustani notation. A star '*' is used to designate octaves — *Ni is in the octave below Sa. Ni* is in the octave above. Sa** is two octaves above Sa. See note on notation below.
• See note below on sources for string diameters.
• See string tension graphs

String tension: lbs

 Sa tuned to: Bb3 B3 C4 C#4 D4 D#4 E4 F4 * or: Hz

left right
top: in.
bottom: in.
bridge-1:
Length # Note Freq Plain Wound
in Hz in in % in in
<---------------------------------------------------------> 9.25 [R15] 30
 880
 0.009
 0.009
 48.9
 0.01
 -
[L15] 9.71 <------------------------------------------------------------> 29
 830.61
 0.009
 0.009
 48.1
 0.01
 -
<------------------------------------------------------------> 9.86 [R14] 28
 783.99
 0.01
 0.01
 44.4
 0.01
 -
[L14] 10.29 <---------------------------------------------------------------> 27
 739.99
 0.01
 0.01
 43.2
 0.01
 -
<---------------------------------------------------------------> 10.46 [R13] 26
 698.46
 0.01
 0.01
 40.1
 0.011
 -
[L13] 10.88 <------------------------------------------------------------------> 25
 659.26
 0.011
 0.011
 38.7
 0.011
 -
<------------------------------------------------------------------> 11.07 [R12] 24
 622.25
 0.011
 0.011
 35.9
 0.011
 -
[L12] 11.46 <---------------------------------------------------------------------> 23
 587.33
 0.011
 0.011
 34.4
 0.012
 -
<------------------------------------------------------------------------> 11.68 [R11] 22
 587.33
 0.011
 0.011
 35.6
 0.011
 -
[L11] 12.04 <------------------------------------------------------------------------> 21
 554.37
 0.011
 0.012
 33.9
 0.012
 -
<---------------------------------------------------------------------------> 12.29 [R10] 20
 523.25
 0.012
 0.012
 31.6
 0.012
 -
[L10] 12.63 <---------------------------------------------------------------------------> 19
 493.88
 0.012
 0.012
 29.8
 0.013
 -
<------------------------------------------------------------------------------> 12.89 [R9] 18
 466.16
 0.013
 0.013
 27.9
 0.013
 -
[L9] 13.21 <---------------------------------------------------------------------------------> 17
 440
 0.013
 0.013
 26.2
 0.014
 -
<---------------------------------------------------------------------------------> 13.50 [R8] 16
 440
 0.013
 0.013
 27.3
 0.013
 -
[L8] 13.79 <------------------------------------------------------------------------------------> 15
 415.3
 0.013
 0.013
 25.5
 0.014
 -
<------------------------------------------------------------------------------------> 14.11 [R7] 14
 392
 0.014
 0.014
 23.9
 0.014
 -
[L7] 14.38 <---------------------------------------------------------------------------------------> 13
 369.99
 0.014
 0.014
 22.2
 0.015
 -
<------------------------------------------------------------------------------------------> 14.71 [R6] 12
 349.23
 0.015
 0.015
 20.8
 0.015
 -
[L6] 14.96 <------------------------------------------------------------------------------------------> 11
 329.63
 0.015
 0.015
 19.3
 0.016
 -
<---------------------------------------------------------------------------------------------> 15.32 [R5] 10
 311.13
 0.016
 0.016
 18.1
 0.017
 -
[L5] 15.54 <---------------------------------------------------------------------------------------------> 9
 293.66
 0.017
 0.017
 16.7
 0.017
 -
<------------------------------------------------------------------------------------------------> 15.93 [R4] 8
 293.66
 0.016
 0.016
 17.5
 0.017
 -
[L4] 16.13 <------------------------------------------------------------------------------------------------> 7
 196
 0.024
 0.024
 8.5
 0.025
 0.025
<---------------------------------------------------------------------------------------------------> 16.54 [R3] 6
 261.63
 0.017
 0.017
 15.1
 0.018
 -
[L3] 16.71 <------------------------------------------------------------------------------------------------------> 5
 185
 0.024
 0.024
 8.1
 0.025
 0.025
<---------------------------------------------------------------------------------------------------------> 17.14 [R2] 4
 246.94
 0.018
 0.018
 14.5
 0.019
 -
[L2] 17.29 <---------------------------------------------------------------------------------------------------------> 3
 164.81
 0.027
 0.027
 7
 0.028
 0.027
<------------------------------------------------------------------------------------------------------------> 17.75 [R1] 2
 220
 0.019
 0.019
 12.5
 0.02
 0.02
[L1] 17.88 <------------------------------------------------------------------------------------------------------------> 1
 146.83
 0.029
 -
 6
 0.03
 0.03

### Notes:

1. Notation: (see Wikipedia)
"In some notation systems, the distinction is made with capital and lowercase letters. When abbreviating these tones, the form of the note which is relatively lower in pitch always uses a lowercase letter, while the form which is higher in pitch uses an uppercase letter. So komal Re/Ri uses the letter r and shuddha Re/Ri, the letter R, but shuddha Ma uses m because it has a raised form - tivra Ma - which uses the letter M. Sa and Pa are always abbreviated as S and P, respectively, since they cannot be altered."
2. String diameter availablity is based on diamaters listed at Mapes , JustStrings , and d'Addario as of 11/22/2016.
3. Length is the distance from bridge to rail — the vibrating length of the string.
4. '%' is the percentage of breaking tension for the calculated string diameter.
5. If a bridge is missing calculated values (frequency, diameters, etc) it is likely that the note name is invalid. Only the two-letter notation works along with octave '*' markings (prefix for below, suffix for above)

mg , rgs , rg