Erg Calculator
Enter any two of distance, time, split or watts, then press Calculate. The other two are worked out from the standard Concept2 formula. Times can be typed straight off the monitor with no colon: 700 is 7:00, 145 is 1:45.
Fill in any two fields, then press Calculate. Times can be typed without a colon: 700 is 7:00, 145 is 1:45.
How it works
Watts come from pace alone: watts = 2.80 ÷ (split ÷ 500)³. That means split and watts are two ways of saying the same thing. Set either one and the other follows immediately.
Distance and time are the other half. Any pair that includes one of those pins the whole picture down: distance and time give you the split, and a split plus either one gives you the other.
The one combination that can't resolve is split together with watts. That fixes your pace twice over without saying how far or how long you went, so distance and time stay empty until you fill one in.