Resistor combination calculator

Enter the resistor value you need in Ohms (sorry, no unit parsing/converter now), pick your maximum number of resistors in the combination, choose the resistor values available to make combination (you can even pick custom subsets of E12 or E24), adjust the combination type (parallel only, series only or both), hit the "Compute" button.
Mind you, the closeness of the combination value to your required one doesn't guarantee that you'll actually obtain that value using resistors with a tolerance of ±10% (E12) or ±5% (E24).

Every additional resistor in the combination will improve the quality of the resulted values by roughly two orders of magnitude. However asking for combinations made of a higher number of resistors will cause longer searches for combinations (an exponential growth). The calculator will restrict the maximum number of resistors in combination based on the number of the available/input resistor values.

Desired value
Resistor set
Max # in combination
Combination type

For input sets up to 24 values, you can request combinations up to 6 resistors.
For input sets up to 36 values, the maximum number of resistor in the combination is 5
For up to 72 input values (full E12 included), combinations up to 4 resistors may be requested
For more than 72 values, only combinations of 3 resistors will be considered

Even with those restrictions, a full scan of all combinations may take quite a while; hit the "Cancel" button earlier if you see a result that's good enough

Combination (*:parallel,+:series)	Value	Rel.err (% of target)	Min.value (% of target)	Max.value (% of target)