Christian Investment Calculator

The short version: no faith-based organization publishes a genuinely distinctive investment calculator — Ramsey, GuideStone and Crown between them cover the standard set, and the arithmetic is the same arithmetic everyone uses. What matters is the assumptions you feed it. The long-run S&P 500 return is 10.02% nominal over 98 years, and the cheapest faith-based index fund costs about 7.5 basis points more than the cheapest secular one.

A calculator is only as honest as its inputs. This article gives you the verified 2026 numbers to put into one, and flags the assumption most likely to mislead you.

Table of Contents

What faith-based calculators actually exist

Ramsey Solutions has the most complete suite, twelve calculators, all live: Investment, Retirement, Compound Interest, Net Worth, Budget, Debt Snowball, Student Loan Payoff, Mortgage, Mortgage Payoff, Cost of Living, College Savings, and Term Life Insurance.

GuideStone offers five: a Traditional IRA calculator, Life Insurance, APR Mortgage, a “Cool Million” calculator that projects when your savings plan makes you a millionaire, and a Checkbook Balancer.

Crown Financial Ministries offers twelve, including Debt Snowball, Net Worth, Mortgage Amortization and Refinancing, Auto Loan and Lease, Compound and Simple Interest, Retirement Savings, Loan Affordability, Savings Goal, and Life Insurance.

Some negative findings so you do not go looking: FaithFi ships an app rather than calculators, Timothy Plan’s resources section has none, and the National Christian Foundation’s calculator page is gone.

Note what is missing from all of them. Nobody publishes a calculator that models the cost of faith-based screening — the one calculation genuinely specific to this audience. The rest is compound interest, which works identically regardless of what you believe.

The 2026 numbers a calculator needs

Every figure below is from IRS Notice 2025-67, Revenue Procedure 2025-19, or the Social Security Administration.

Item	2026	2025
401(k) / 403(b) / 457(b) elective deferral	$24,500	$23,500
Catch-up, age 50+	$8,000 (total $32,500)	$7,500
Higher catch-up, ages 60–63	$11,250 (total $35,750)	$11,250
Traditional and Roth IRA	$7,500	$7,000
IRA catch-up, 50+	$1,100 (total $8,600)	$1,000
Total annual additions limit	$72,000	$70,000
HSA, self-only / family	$4,400 / $8,750	$4,300 / $8,550
SEP-IRA	25% of comp, max $72,000	$70,000
Qualified charitable distribution limit	$111,000	$108,000

Phase-outs for 2026: Roth IRA contributions phase out from $153,000 to $168,000 for single filers and $242,000 to $252,000 for joint filers. Traditional IRA deductibility phases out from $81,000 for a single filer covered by a workplace plan. The Saver’s Credit cuts off at $80,500 joint.

Two structural rules a calculator will not tell you. Required minimum distributions begin at 73, and Roth IRAs are exempt from them entirely. And if your wages from an employer exceeded $150,000 in 2025, your 2026 catch-up contributions must be Roth — which changes the tax line in any projection you build.

The return assumption that matters most

This is where calculators mislead, and the error compounds over thirty years.

The best-documented long-run figure comes from Aswath Damodaran’s dataset at NYU Stern, updated in January 2026 with data through calendar 2025. $100 invested in the S&P 500 with dividends reinvested at the start of 1928 grew to $1,157,598 by the end of 2025 — a compound annual return of 10.02% over 98 years.

The comparators over the same period:

Asset	$100 grew to	98-year annual return
US small cap	$6,462,598	11.97%
S&P 500 with dividends	$1,157,598	10.02%
Baa corporate bonds	$53,952	6.63%
Gold	$21,025	5.61%
10-year Treasury	$7,752	4.54%
Real estate	$5,626	4.20%
3-month Treasury bill	$2,578	3.37%

Now the flag. Ramsey’s own investment calculator page describes “ETFs that average 10-12%” annual returns. The top of that range sits meaningfully above the verified 98-year figure. It is a modelling assumption, not a historical fact, and the difference is not academic — projecting 12% instead of 10% on $500 a month for thirty years overstates the ending balance by roughly 40%.

Use 10% nominal if you want the historical average. Use something lower if you want a projection you are unlikely to be disappointed by, and remember that inflation takes roughly three points off the nominal figure over long periods.

The other thing a smooth compound-interest curve hides is the path. Recent single years from the same dataset: 2025 up 17.78%, 2024 up 24.88%, 2023 up 26.06%, 2022 down 18.04%, 2021 up 28.47%. The worst years on record are 1931 at −43.84%, 2008 at −36.55%, and 1937 at −35.34%. No calculator shows you the year your balance falls by a third, and that is the year that determines whether your plan survives.

What faith-based funds cost, precisely

Here is the calculation nobody in this space states plainly, and it is the one Christian investors actually want.

The cheapest faith-based S&P-500-style fund is Inspire’s PTL at 0.09%. The cheapest comparable secular index funds are Fidelity’s FXAIX at 0.015% and Vanguard’s VOO at 0.03%.

So screening costs you roughly 7.5 basis points a year — about $7.50 annually per $10,000 invested. On a $100,000 portfolio, $75 a year. That is the honest price of the cheapest available faith-based option, and it is far smaller than most people assume.

The gap widens considerably against other faith-based funds:

CATH (Catholic values): 0.29%
Praxis’s forthcoming ETFs: 0.36%
Inspire BIBL: 0.35%
GuideStone Equity Index: 0.39%
Ave Maria Bond: 0.42%
Timothy Plan ETFs: 0.52% to 0.62%
Actively managed faith-based funds: 0.80% to 1.94% gross

Against an actively managed BRI fund at 1.2%, you are paying roughly 118 basis points more than FXAIX — about $118 a year per $10,000, and over thirty years that compounds into a meaningful sum. Whether it is worth it depends on whether you want screening alone or screening plus active management, and those are separate decisions that get bundled together in the sales conversation.

Run the number for your own balance before accepting either the claim that screening is free or the claim that it is prohibitively expensive. Our guides to the best Christian ETFs and the best BRI funds compare the lineups in detail.

The calculation almost nobody runs

If you are 70½ or older, the qualified charitable distribution is the most tax-efficient giving mechanism available, and no faith-based calculator models it.

You can send up to $111,000 in 2026 directly from an IRA to a qualified charity. The amount is excluded from income rather than deducted, which is better — it never enters your adjusted gross income, so it cannot push up your Medicare surcharge or the taxable portion of your Social Security. It also counts toward your required minimum distribution.

The window between 70½ and 73 is the part people miss. Distributions are not yet required, so every dollar sent to charity in those years permanently shrinks the account balance that all future required distributions are calculated from. Done for three years at meaningful amounts, it reduces your taxable income for the rest of your life.

Rules: it must go directly from the custodian to the charity, it is unavailable from an ongoing SEP or SIMPLE IRA, and donor-advised funds do not qualify. Report the full distribution on the IRA line, enter zero as taxable, and write “QCD” beside it.

One 2026 change relevant to everyone else: for the first time since 2021, households that do not itemize can deduct up to $1,000 of cash giving, or $2,000 filing jointly, and churches qualify. Itemizers now face a floor — only giving above 0.5% of income counts, so a household at $150,000 loses the deduction on its first $750.

Why the arithmetic is worth doing

Jesus treats calculation as a mark of seriousness rather than a lack of faith: “Suppose one of you wants to build a tower. Won’t you first sit down and estimate the cost to see if you have enough money to complete it?” (Luke 14:28). The context is discipleship, not construction — he is arguing that anyone who begins something without counting what it requires is not to be admired. Estimating the cost is the faithful behaviour in the parable.

Proverbs adds the contrast between planning and haste: “The plans of the diligent lead to profit as surely as haste leads to poverty” (Proverbs 21:5). Haste, not risk. The failure mode is acting without having worked it out.

What a calculator cannot supply is the finish line. Ron Blue has spent forty years asking a single question — how much is enough? — and no spreadsheet answers it. A projection will tell you what $500 a month becomes in thirty years. It will not tell you whether that number is the right target, or what you intend the surplus above it to do. Those are the decisions that actually determine whether the money did any good.

Our guides to how much Christians should save for retirement and tithing and giving take up both halves of that question.