Calculators
F&O Calculator.
Contract maths for futures and options: charges, breakeven, payoff and time decay. Numbers first, on a position you are only considering.
Built for the instruments and conventions of the Indian F&O market (futures, calls, puts, multi-leg positions), for anyone who wants to see what a position risks, worked out in the maths, before they take it.
What you get
Numbers first.
Charges, in full
What a contract actually costs once every charge is counted, not just the visible one.
The kind of arithmetic that's easy to underestimate when you're doing it in your head.
Everything that applies to the contract is counted once, in one place, instead of pieced together from memory.
Nothing here is rounded off or estimated on your behalf.
Breakeven and payoff
Where the maths turns, and what the shape of the position looks like across the range.
Seeing the shape of it before you're in the position is the whole point of working it out first.
It's the same shape whether the position is simple or has a few legs to it: the calculator works through all of it the same way.
Time decay
What holding costs you as the clock runs: the part that is easy to forget until it has already happened.
It's counted in from the start, not left for you to notice later.
It's shown alongside the rest of the numbers, not as a separate step you have to remember to check.
What's inside
What it does.
One position at a time
Built for the position you are only considering, not for a book of them. You enter the contract; it does the arithmetic.
What this isn't
No signals, no calls, no buy-this-sell-that, and no view on your position. It is a calculator: it gives you the maths, you decide everything else.
How it works
Sign in, and type it in.
Sign in at the Desk. It takes a moment: the same account that holds everything else you own there.
It's the one sign-in for everything you own at Efficient Earners, not a separate account for each product.
Open the calculator from your library and type in the contract you're considering: nothing is pre-filled and nothing is suggested.
There's no separate page to hunt for it on: it opens straight from your library.
There's nothing to set up beforehand: you open it, type in the contract, and the numbers are there.
Nothing is suggested to you before you've typed anything: the first number on the screen is always your own.
Read the numbers it returns. What you do with them, and whether you act on the position at all, stays entirely yours.
Change a number and see how the shape of the position changes with it: there's no limit on how many times you run it.
You type the contract in; it works the maths and stops there: nothing about it is automatic beyond that.
What you type here is saved to your account: there when you sign in from another device, not just this one.
Nothing else changes because of that: it still holds no market data and connects to no broker, exactly as before.
Who it's for
For the maths you'd rather not do by hand.
If you already look before you leap
This is for anyone who wants to see the full cost and shape of a position before deciding anything about it: a habit, not a special skill.
It rewards the same question asked every time, not a one-off check before a big decision.
It's built for one question at a time: what does this specific position actually cost, and what does it look like if it moves.
If you're comparing more than one idea
Run one position, note the numbers, then move to the next whenever you're ready: comparing two ideas never requires opening two calculators.
There's no limit on how many positions you work through in one sitting.
Finish with one position and move straight to the next whenever you're ready: nothing about the last one gets in the way.
Not a trading terminal
It does not watch the market, does not track a live position, and does not carry a single instrument's data in or out. You bring the numbers; it works them.
If what you want is a screen that follows a position after it's placed, that's not what this is for.
There's nothing to install and nothing to configure first: you open it and the fields are already waiting for numbers.
Honest answers
Before you use it.
Does it connect to my broker?
No. Nothing is linked and nothing is placed anywhere. You type in the contract, it returns the maths.
Does it carry market data?
No. You supply the numbers you are working with. The app holds no market data of any kind.
Will it tell me what to buy or sell?
No. Nothing at Efficient Earners does. It works the contract maths and stops there: every decision after that is yours.
Does it save what I type in?
Yes, your work here is saved to your account, so it's there again if you open the calculator later or from another device. Nothing else about the position is added or changed; it's exactly what you typed.
Can I use it for more than one position?
One at a time, by design: it's built to work through a single position closely rather than manage a book of them. Open a new one whenever you're ready to look at the next; there's no limit on how many you work through in a day.
Does saving my work mean it's connected to my broker or the market?
No. Saving is only what you typed, kept to your account. It still holds no market data of any kind and links to nothing outside itself, exactly as before.
Most of what a contract costs is settled before it is ever placed, in arithmetic nobody enjoys doing by hand.