A Time Exchange Rate, or TER, is the real hourly value of your time: the net value you keep from an activity, divided by the total hours that activity truly consumes. For a job, that is take-home pay after tax and the costs of working, divided by contracted hours plus commute plus the unpaid hours the work quietly takes.
The formula
One line, two questions. What do you actually keep, and what does it actually cost you in hours.
Both halves must cover the same period. Annual over annual, or weekly over weekly. Mixing them is the most common way to get a wrong answer that looks right.
What each term means
| Term | What it covers |
|---|---|
| Gross value received | Everything the activity pays you. Salary, bonus, employer contributions you can actually access, side income attached to the same hours. |
| Tax | Your effective rate, not your marginal bracket. The share of the total that never reaches you. |
| Costs incurred to earn it | Money you would not spend if you did not do this. Commuting, parking, professional fees, the clothes, the second car, the childcare that exists because of the schedule. |
| Contracted hours | The hours you are formally paid for. |
| Commute | Door to door, both directions, every day you travel. Hours you spend but nobody pays for. |
| Adjacent hours | Email after dinner, the Sunday catch-up, the mental rehearsal before a hard meeting, travel that is not commute. Unpaid, unlogged, and real. |
| Recovery hours | The time the work takes to shake off before you are usable again. Hardest to measure, and the one most people underestimate. Set it to zero if you would rather not estimate it, and know your rate is then a ceiling rather than a figure. |
Two rates, not one. Your gross TER divides gross value by true hours and tells you what the market thinks an hour of you is worth. Your net TER divides what you keep by the same hours and tells you what an hour of your life is actually converting into. Quote the net one. It is the honest number.
A worked example
Someone on $95,000. Forty-five hours a week in practice rather than the forty on paper, four hours of work-adjacent time, thirty-five minutes each way to the office five days a week, forty-eight working weeks after leave. Effective tax rate 24 percent. Commuting and parking $2,400 a year, other work costs $1,200. Recovery hours set to zero, which makes this a conservative reading.
| Line | Working | Amount |
|---|---|---|
| Gross income | salary + other | $95,000 |
| Less tax at 24% | 95,000 × 0.24 | −$22,800 |
| Less commuting and parking | −$2,400 | |
| Less other work costs | −$1,200 | |
| Value kept | $68,600 |
| Hours | Working | Per year |
|---|---|---|
| Contracted and actual work | 45 × 48 | 2,160 |
| Work-adjacent | 4 × 48 | 192 |
| Commute | 35 min × 2 × 5 × 48 ÷ 60 | 280 |
| Recovery | not estimated | 0 |
| Hours the job consumes | 2,632 |
Net Time Exchange Rate = $26.06 per hour
Gross Time Exchange Rate = $36.09 per hour
Salary divided by 2,080 would have said $45.67 per hour.
The conventional figure overstates this person's hour by 75 percent. Not because the arithmetic is hard, but because the standard method counts only the hours somebody paid for, and only the money before anyone took a share of it. The 280 commuting hours alone are seven working weeks that appear in no payslip.
The point is not that $26.06 is depressing. The point is that $26.06 is usable. It is the number that tells you whether a two-hour round trip to save $40 is a good trade, and it says no.
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Your inputs
What a Time Exchange Rate is not
- Not your wage. A wage is what an employer pays for contracted hours. A TER is what you receive for the hours the job actually takes. The wage is always the larger number.
- Not a billing rate. What you charge a client is a price set by a market. Your TER is a measurement of your own position, and the two can differ by a factor of three without either being wrong.
- Not a productivity score. It measures the terms of a trade, not how hard you worked or how well.
- Not a reason to monetise everything. The rate exists to price the hours you are trading away, so that the hours you are protecting can be chosen instead of surrendered. An hour with a child does not need a price. The hour of admin that displaced it does.
Three decisions the number is for
1. The buy-back threshold
Any task you can pay someone else to do for less than your TER, and that does not need you specifically, is being done at a loss when you do it yourself. At $26.06 an hour, three hours of your Saturday spent on something that costs $60 to outsource is a $18 loss, before counting what the Saturday was worth.
2. The real price of a purchase
Convert the price into hours before deciding. A $780 item is 30 hours of life at $26.06. That is not an argument against buying it. It is the argument stated in the units you actually pay in.
3. The cost of a meeting
Multiply the TER of everyone in the room by the length. A weekly hour with six people whose average TER is $40 costs $240 a week, $12,480 a year, and nobody ever sends an invoice. Meetings survive because their cost is never denominated.
A rate you compute once and file away has done nothing. A rate you can recall in the moment a decision arrives is the whole point.
Four ways people get it wrong
- Using the marginal tax bracket instead of the effective rate. The bracket applies to your last dollar, not all of them. It understates the answer.
- Counting contracted hours instead of actual hours. If the number on the contract is 40 and the number in the calendar is 47, the contract is the wrong input.
- Leaving out the commute because it feels like personal time. Hours spent travelling to a job would not be spent if the job did not exist. Transport agencies have priced non-work travel time for decades precisely because it has value; the US Department of Transportation publishes official guidance on valuing it in federal analysis.
- Comparing your TER to someone else's. It is a personal instrument, not a leaderboard. The only comparison that carries information is your TER now against your TER after a change you are considering.
The wider principle is not novel, and it should not be presented as though it were. Formal economics has valued non-market time for decades: the Second Panel on Cost-Effectiveness in Health and Medicine requires patient time and unpaid caregiver time to appear in any societal-perspective analysis. What the Time Exchange Rate adds is not the idea that time has value. It is a single personal figure, computed the same way every time, that an individual can actually carry into a decision.
The same formula, other subjects
The structure holds whenever value and hours can both be attributed to the same activity. Only the inputs change.
- Household TER. Two incomes, shared costs, and the unpaid hours of running a home. Answers whether a second income survives contact with childcare and the second commute.
- Owner TER. For a business owner the numerator is profit after every operating cost, and the denominator is every hour the owner gives the business, including the ones nobody sees. This is the version built into the Dental Practice TER Calculator, where the numerator carries payroll, occupancy, laboratory bills, insurance write-offs and debt service, and the denominator carries the chair time nobody sat in.
- Project TER. Applied to one engagement rather than a year, it is the cleanest way to see that the profitable-looking client is the one destroying your calendar.
Questions
- How is a Time Exchange Rate different from an hourly wage?
- A wage is the price an employer pays for contracted hours. A Time Exchange Rate is the price you actually receive for the hours the job consumes. The wage ignores tax, commuting and the cost of working. The TER counts all of them, so it is always the lower figure.
- Why not just divide salary by 2,080?
- Because 2,080 assumes 40 hours for 52 weeks with no commute, no unpaid overtime, no tax and no cost of working. Every one of those assumptions pushes the answer the same way, which is why the method overstates rather than understates.
- What if I work from home?
- The commute term goes to nearly zero, which raises the rate, and that is the correct result. Remote work is a pay rise that never appears on a payslip. Adjacent hours often rise at the same time, so run both terms rather than assuming the change is all upside.
- Should recovery hours really count?
- They are the hardest term to defend and the easiest to abuse, so treat them carefully. If you cannot estimate them honestly, set them to zero and read your rate as a ceiling. A rate you can defend beats a rate that flatters your argument.
- Does this mean every hour should be monetised?
- No. The rate is a unit of account, not a target. Rest, care and relationships are what the rate is calculated in service of, not competitors to it.
- Who defined the term?
- The Time Exchange Rate is defined by Mert Sahin, PhD, in Time: The Ultimate Currency. This page is the canonical definition.
How to cite this page
https://www.timeultimatecurrency.com/time-exchange-rate/
Author of Time: The Ultimate Currency. Holds a PhD in Cell and Molecular Biology from the University of Hamburg and has more than twenty years of leadership experience from venture-backed startups to multibillion-dollar global conglomerates. More about the author.