The 25 Essential Tools of Excellence (v2), 24: The Personal Calculator

Man is a generalist. No harm in that: he/she is remarkably adept at adapting and to enhance this process has created a batch of tools which allows him/her to perform to the highest levels.

When push comes to shove, what are the essential Tools of Excellence?

24: The Personal Calculator (on your phone, of course)

Many a start-up has believed it's making money when the revenue comes in. But then when it can't fund the pay-roll it learns that there is revenue and there is profit. They are not the same. You ensure you know the difference by regular, rapid use of your pocket calculator. Forgotten the formula? It's here.

Many aspects of life are similar: getting a handle on the figures allow excellence:  be it profit made, potential future pension worth or calorie requirements for marathon training.

The Excellence Kit-Bag so far:

1: The Wall and A Ball

2: The Play List

3: The Back of an Envelope

4: Perfect Coffee

5: The Stop Watch

6: The Skipping Rope

7: Trail-Mix

8: The Treasured Note/Photo

9: The Swiss Army Knife

10: The Compass

11: The Wall Planner

12: Two Short, Intersecting Lines.

13: The Camera on your Phone

14: The Steel Water Bottle

15: The Flight Deck

16: The Propelling Pencil

17: The Vegetable Steamer

18: The Pause

19: The Fixie

20: The Beanie.

21: The Hike

22: The Isle of Harris blanket

23: A Pair of Binoculars

Bonus: How To be Brilliant.