Oil And Gas Investment Calculator

I priced the same 150-barrel-a-day well at each recent year's average oil price, and the payback period moved further than I expected. A $400,000 unit recovers its cost in 11.1 months at 2022's Brent average of $100.93, in 16.8 months at 2025's $69.14, and never at 2020's $41.96, which is a long time to wait for a check you already cashed in your head.

I built this oil and gas investment calculator to test a joint venture working interest before I believe its pitch deck. Four numbers decide whether a well pays you back: the oil price, how fast the well produces, how much oil it can reach, and who gets paid before you do. The questions I would put to the sponsor come first, then the sections below take those numbers in order and cover taxes and the sponsor.

Here are 5 more to ask before you sign.

1. What production and decline rates are you assuming, and can the well reach its reserves at that decline?
2. Who prepared the reserve report, and can I read it?
3. What do the royalty and overrides add up to, and what net revenue interest is left for me?
4. What working interest do you hold yourself, and did you pay cash for it or receive it free as a carried interest?
5. Is the offering registered with my state securities regulator, or exempt?

Price comes first because it is the one number nobody at the well controls, and below about $46.73 a barrel the default well never pays back.

Method: I ran the engine behind the cards on this page on October 16, 2026 at EIA annual Brent averages, with every other default held fixed, and found the break-even by halving the range between $1 and $200. To repeat a row, change only the oil price in the first card. Gas is held at 100 Mcf a day: EIA's 2024 figures for gas from oil wells and crude production, with Alaska, the federal offshore and tight oil taken out, give conventional onshore wells 0.65 to 0.76 Mcf of gas per barrel, about 100 Mcf a day at 150 barrels.

The easiest way to overestimate an oil and gas return is to price the well at whatever oil fetched the week the cover slide was made.

The next two numbers belong to the well, and the result that surprised me most is that they answer different questions. At $69.14 oil, the daily production rate changes when a unit gets paid and barely changes how much. Cutting production from 300 to 50 barrels a day stretches payback more than eightfold while net cash slips 2%, and growing the reserves from 75,000 to 200,000 barrels does the reverse: payback holds at 16.8 months and the total grows 2.6-fold.

Decline hides a cliff. A well starting at 150 barrels a day and declining 65% a year can only ever produce about 52,000 barrels (starting monthly output divided by the monthly decline rate), half of what the default reserves promise, and any decline steeper than about 42% a year leaves those 100,000 barrels out of reach. Wells run dry sooner than the reserve estimate predicts when the curve gives out before the rock does.

What I took from these runs: the starting production rate in a pitch sells speed, and the reserve report sells money.

The fourth number is who gets paid before you do. A royalty interest is the mineral owner's share of production revenue, paid without contributing a dollar to drilling or operating costs. An overriding royalty is the same cost-free slice carved out of the working interest, and the working interest is everything else: the right to produce the well and the duty to pay for it.

The royalty is the cost that matters most. When I ran the default well at 2025 prices, the 12.5% royalty took $90,469 from one unit over the life of the well, more than five times the $16,245 that unit paid in operating costs, and raising the operating cost fivefold from $500 to $2,500 a month moved payback by 0.2 months. Before arguing with a sponsor about overhead, read the royalty line in the lease, because that cost gets paid before the pump finishes its first stroke.

Once the well and the lease hold up, the last number is mine: how much was I willing to invest, and how much of the program should it buy?

This calculator will help answer these questions by pricing a stake in units. One unit is $400,000, a tenth of the program, and the slider sells eighths of a unit from $50,000 to $4,000,000. Payback takes the same time at any size, because revenue and operating cost both scale with your share, so a $50,000 stake waits as long as the whole program does.

Taxes change when you keep what the well earns, and the 2022 version of this page got them wrong. It said drilling costs were "100% deductible but must be depreciated over seven years," which merges two rules, and spread operating costs "over the life of the lease," a timetable the IRS guide does not use. I rechecked every tax line against the IRS Oil and Gas Audit Technique Guide on October 12, 2026; the table below has the corrected rules, plus the 15% percentage depletion and passive loss exception it left out.

Every number above assumes the sponsor's figures are true. How risky did I want to be? No calculator answers the question that decides it: how much could I lose without changing how I live?

Would I invest if the managing partner kept no working interest of their own? A sponsor drilling on investors' money alone collects fees whether or not the well pays, while one holding a working interest beside me pays the same share of every invoice I do and reads those invoices far more closely.

The calculator assumes the well produces what the sponsor says it will, and it cannot see downtime, a dry hole, a workover bill or money that drifted somewhere other than the well.

• EIA Short-Term Energy Outlook: monthly oil and gas price forecasts
• EIA: annual Brent and WTI spot prices
• IRS: Oil and Gas Audit Technique Guide
• Cornell LII: 26 U.S.C. 613A, percentage depletion for oil and gas
• NASAA: warning on oil and gas investment deals
• PCDrama: the full oil and gas revenue calculator

The EIA publishes the price history every projection on this page starts from, and the IRS guide is the reference its own examiners use when they audit an oil and gas return.

This calculator is for illustration only. Its results are not investment, tax or legal advice and do not promise any rate of return or cash flow, so talk to a CPA familiar with oil and gas before you invest.

Sources: EIA Short-Term Energy Outlook, April 2022, EIA spot prices, EIA gas withdrawals from oil wells, EIA crude oil production, IRS Oil and Gas Audit Technique Guide, IRS bonus depreciation guidance, 26 U.S.C. 613A, 26 U.S.C. 469, IRS Publication 550, NASAA