CALCULATORS

 

 

 

There are probably dozens of sites with useful calculators but I felt that it took a long time to search for them when you needed them,often only to find a broken link so I have tried to collect the more commonly used formula calculators and tables here as a central reference point, there are links to the less common ones. Credit/link is given where known to original site.
Thanks to all those who have contributed.

 
No responsibility  can be taken for any errors or omissions or ensuing equipment damage or warranty infringements.
Copyright remains with the original source url which is shown wherever possible. Anyway it wasn't me I'm not clever enough.

RF Power Table (for 50 ohms)
CONVERSION CHART

dBm

Volts

Watts

60 dBm 
223.61 V 
1.00 kW 
59 dBm 
199.29 V 
794.33 W 
58 dBm 
177.62 V 
630.96 W 
57 dBm 
158.30 V 
501.19 W 
56 dBm 
141.09 V 
398.11 W 
55 dBm 
125.74 V 
316.23 W 
54 dBm 
112.07 V 
251.19 W 
53 dBm 
99.88 V 
199.53 W 
52 dBm 
89.02 V 
158.49 W 
51 dBm 
79.34 V 
125.89 W 
50 dBm 
70.71 V 
100.00 W 
49 dBm 
63.02 V 
79.43 W 
48 dBm 
56.17 V 
63.10 W 
47 dBm 
50.06 V 
50.12 W 
46 dBm 
44.62 V 
39.81 W 
45 dBm 
39.76 V 
31.62 W 
44 dBm 
35.44 V 
25.12 W 
43 dBm 
31.59 V 
19.95 W 
42 dBm 
28.15 V 
15.85 W 
41 dBm 
25.09 V 
12.59 W 
40 dBm 
22.36 V 
10.00 W 
39 dBm 
19.93 V 
7.94 W 
38 dBm 
17.76 V 
6.31 W 
37 dBm 
15.83 V 
5.01 W 
36 dBm 
14.11 V 
3.98 W 
35 dBm 
12.57 V 
3.16 W 
34 dBm 
11.21 V 
2.51 W 
33 dBm 
9.99 V 
2.00 W 
32 dBm 
8.90 V 
1.58 W 
31 dBm 
7.93 V 
1.26 W 
30 dBm 
7.07 V 
1.00 W 
29 dBm 
6.30 V 
794.33 mW 
28 dBm 
5.62 V 
630.96 mW 
27 dBm 
5.01 V 
501.19 mW 
26 dBm 
4.46 V 
398.11 mW 
25 dBm 
3.98 V 
316.23 mW 
24 dBm 
3.54 V 
251.19 mW 
23 dBm 
3.16 V 
199.53 mW 
22 dBm 
2.82 V 
158.49 mW 
21 dBm 
2.51 V 
125.89 mW 
20 dBm 
2.24 V 
100.00 mW 
19 dBm 
1.99 V 
79.43 mW 
18 dBm 
1.78 V 
63.10 mW 
17 dBm 
1.58 V 
50.12 mW 
16 dBm 
1.41 V 
39.81 mW 
15 dBm 
1.26 V 
31.62 mW 
14 dBm 
1.12 V 
25.12 mW 
13 dBm 
1.00 V 
19.95 mW 
12 dBm 
890.19 mV 
15.85 mW 
11 dBm 
793.39 mV 
12.59 mW 
10 dBm 
707.11 mV 
10.00 mW 
9 dBm 
630.21 mV 
7.94 mW 
8 dBm 
561.67 mV 
6.31 mW 
7 dBm 
500.59 mV 
5.01 mW 
6 dBm 
446.15 mV 
3.98 mW 
5 dBm 
397.64 mV 
3.16 mW 
4 dBm 
354.39 mV 
2.51 mW 
3 dBm 
315.85 mV 
2.00 mW 
2 dBm 
281.50 mV 
1.58 mW 
1 dBm 
250.89 mV 
1.26 mW 
0 dBm 
223.61 mV 
1.00 mW 

dBm

Volts

Watts

 
0 dBm 
223.61 mV 
1.00 mW 
-1 dBm 
199.29 mV 
794.33 uW 
-2 dBm 
177.62 mV 
630.96 uW 
-3 dBm 
158.30 mV 
501.19 uW 
-4 dBm 
141.09 mV 
398.11 uW 
-5 dBm 
125.74 mV 
316.23 uW 
-6 dBm 
112.07 mV 
251.19 uW 
-7 dBm 
99.88 mV 
199.53 uW 
-8 dBm 
89.02 mV 
158.49 uW 
-9 dBm 
79.34 mV 
125.89 uW 
-10 dBm 
70.71 mV 
100.00 uW 
-11 dBm 
63.02 mV 
79.43 uW 
-12 dBm 
56.17 mV 
63.10 uW 
-13 dBm 
50.06 mV 
50.12 uW 
-14 dBm 
44.62 mV 
39.81 uW 
-15 dBm 
39.76 mV 
31.62 uW 
-16 dBm 
35.44 mV 
25.12 uW 
-17 dBm 
31.59 mV 
19.95 uW 
-18 dBm 
28.15 mV 
15.85 uW 
-19 dBm 
25.09 mV 
12.59 uW 
-20 dBm 
22.36 mV 
10.00 uW 
-21 dBm 
19.93 mV 
7.94 uW 
-22 dBm 
17.76 mV 
6.31 uW 
-23 dBm 
15.83 mV 
5.01 uW 
-24 dBm 
14.11 mV 
3.98 uW 
-25 dBm 
12.57 mV 
3.16 uW 
-26 dBm 
11.21 mV 
2.51 uW 
-27 dBm 
9.99 mV 
2.00 uW 
-28 dBm 
8.90 mV 
1.58 uW 
-29 dBm 
7.93 mV 
1.26 uW 
-30 dBm 
7.07 mV 
1.00 uW 
-31 dBm 
6.30 mV 
794.33 nW 
-32 dBm 
5.62 mV 
630.96 nW 
-33 dBm 
5.01 mV 
501.19 nW 
-34 dBm 
4.46 mV 
398.11 nW 
-35 dBm 
3.98 mV 
316.23 nW 
-36 dBm 
3.54 mV 
251.19 nW 
-37 dBm 
3.16 mV 
199.53 nW 
-38 dBm 
2.82 mV 
158.49 nW 
-39 dBm 
2.51 mV 
125.89 nW 
-40 dBm 
2.24 mV 
100.00 nW 
-41 dBm 
1.99 mV 
79.43 nW 
-42 dBm 
1.78 mV 
63.10 nW 
-43 dBm 
1.58 mV 
50.12 nW 
-44 dBm 
1.41 mV 
39.81 nW 
-45 dBm 
1.26 mV 
31.62 nW 
-46 dBm 
1.12 mV 
25.12 nW 
-47 dBm 
1.00 mV 
19.95 nW 
-48 dBm 
890.19 uV 
15.85 nW 
-49 dBm 
793.39 uV 
12.59 nW 
-50 dBm 
707.11 uV 
10.00 nW 
-51 dBm 
630.21 uV 
7.94 nW 
-52 dBm 
561.67 uV 
6.31 nW 
-53 dBm 
500.59 uV 
5.01 nW 
-54 dBm 
446.15 uV 
3.98 nW 
-55 dBm 
397.64 uV 
3.16 nW 
-56 dBm 
354.39 uV 
2.51 nW 
-57 dBm 
315.85 uV 
2.00 nW 
-58 dBm 
281.50 uV 
1.58 nW 
-59 dBm 
250.89 uV 
1.26 nW 
-60 dBm 
223.61 uV 
1.00 nW 

This calculator can determine the resistance of up to 10 resistors in parallel.
Enter resistances into the boxes below and when all values have been input, click on the CALCULATE button and the result will appear in the box below that button.

IMPORTANT: If you have new values to input, click the RESET button.
(
Manually clearing the boxes does NOT reset stored values).











RESULT:

OHMS LAW FORMULAE from http://www.the12volt.com

 

 

 

RESISTOR COLOUR CODES
4,5 and 6 band
VK3UM Interdigital filter design calculator
THE 555 TIMER IC  

MONOSTABLE TIMEOUT CALCULATOR
Type in the
Capacitor

Value


microFarads
Type in the
Resistor

Value


Ohms
This is
the

TIME OUT


SECONDS
Remember that the capacitor value is in microfarads.  A 10uF cap would be10, a 1nF cap would be 0.001, etc. Resistor values are in Ohms (ie: 1K is 1000, 1M is 1,000,000).
 


(Note: A 7555 is the CMOS version of the 555 and uses a fraction of the 555's power. Pinouts are the same.Use the LMC555 for lower volts supply)

 

 

 


ASTABLE SQUARE WAVE CALCULATOR
Type in the
Capacitor

Value


microFarads
Type in the
Resistor1

Value


Ohms
Type in the
Resistor2

Value


Ohms
This is
the

TIME HIGH


SECONDS
This is
the

TIME LOW


SECONDS
This is
the

FREQUENCY


HERTZ
This is
the

DUTY CYCLE


Percentage

©Copyright 1999 * John Adams http://webhome.idirect.com/~jadams/electronics/555calcs.htm

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50 Ohm attenuators.
Here are some popular values using preferred values so approximate attenuation only.(R3=R1)
.

2.0dB : R1=390 R2= 12
2.5dB : R1=330 R2= 15
3.0dB : R1=390 R2= 18
3.5dB : R1=220 R2= 18
4.0dB : R1=220 R2= 22
5.0dB : R1=180 R2= 28
6.0dB : R1=150 R2= 39
10.dB : R1=100 R2= 68
12 dB : R1=100 R2= 82
14.dB : R1=68 ..R2=120
18 dB : R1=68 ..R2=180
20 dB : R1=56 ..R2=270

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