The Time Exchange Rate

You know your income. You don't know your exchange rate.

Time is the one currency you spend without a price tag. This book gives it the operating system money already has: a rate, a ledger, and the rules to use them. Start by finding what one hour of your life is actually worth.

Calculate your rate Join the list
1 hour= $0.00/ net Your number, in about two minutes
The gap

Money got an operating system. Time got a slogan.


You learned budgets, compound interest, the difference between an asset and a liability. No one built the equivalent for time.

So the hours you spend on things that matter pass by in fragments, a few minutes here, half an hour there, and the days feel full yet empty with little accomplished at the same time. The book calls this "time poverty".

The answer is not moving faster or doing more. It is measurement.

Start with one number

Your Time Exchange Rate

The real hourly value of your time, once commute, after-hours work, taxes, and the cost of working are all counted. It usually lands near half of what a salary implies. Once you have it, a purchase, a meeting, or an obligation stops being a feeling and becomes a figure.

Read the full definition, the formula and a worked example

Step 1: total annual income
Salary
$
Other income
$
Step 2: total annual hours
Work hours / week
hrs
Work-adjacent hours / week
hrs
Commute, one way
min
Commute days / week
days
Weeks worked / year
weeks
Steps 3 and 4: take-home and work costs
Effective tax rate
%
Commuting and parking / year
$
Other work costs / year
$
Keep your number

Get your individual result and the starter time ledger.


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Inside the book

A framework, not a pep talk.

Five parts, built in order, each one resting on the number at the base. Nothing higher up can be worked out until the part beneath it has been.

The arc of Time: The Ultimate Currency A pyramid. Part One and the Time Exchange Rate form the base course, four further courses rise above it, one for each part of the book, and the apex is a time surplus. TIME SURPLUS PART FIVE Living at a time surplus LIVE PART FOUR Time as personal currency CHOOSE PART THREE Time as business currency PRICE PART TWO The time ledger SORT PART ONE Redefining wealth Calculate your Time Exchange Rate MEASURE TIME EXCHANGE RATE = net value kept รท the hours the activity truly consumes
The arc of Time: The Ultimate Currency A pyramid. Part One and the Time Exchange Rate form the base course, four further courses rise above it, one for each part of the book, and the apex is a time surplus. TIME SURPLUS PART FIVE Living at a time surplus LIVE PART FOUR Time as personal currency CHOOSE PART THREE Time as business currency PRICE PART TWO The time ledger SORT PART ONE Redefining wealth Calculate your Time Exchange Rate MEASURE TIME EXCHANGE RATE = net value kept ÷ the hours the activity truly consumes
Who this is for

Anyone comfortable with the concept of money yet short on time.

Written for executives making calendar decisions worth more than they look, founders whose own hours are the company's real constraint, and anyone financially literate who wants a framework instead of another productivity hack.

If you want motivation, this isn't it.
If you want a system, it is.

Front cover of Time: The Ultimate Currency by Mert Sahin, PhD
Coming Soon

Time: The Ultimate Currency

The Operating System for Your Most Finite
and Neglected Resource

Fifteen chapters that build the system end to end, from your personal rate to business decisions to the life the ledger is ultimately for. Templates for filling out the exercises that are mentioned in the chapters are included after each chapter.

By Mert Sahin, PhD.

Get notified at launch Inside the book
About

Mert Sahin, PhD

Mert Sahin, PhD, author of Time: The Ultimate Currency

Mert Sahin holds a PhD in Cell and Molecular Biology from the University of Hamburg in Germany, and has more than twenty years of leadership experience, from venture-backed startups to multibillion-dollar global conglomerates across a range of industries. He has lived and worked across Asia, Europe, Africa and North America, leading turnarounds, scale-ups and international expansions. The lessons from designing those organizations, and from running his own days, shaped the operating system presented in his book.

More about Mert Sahin, the method behind the book, and how to get in touch.