Entry No. 001 — Welcome
Know the number before you sign anything.
19 free calculators for mortgages, loans, savings, and tax — every formula shown in full, so the math is never a black box. No account, no email wall, no ads sitting inside your results.
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The Ledger
Five categories. Every calculator you’ll actually need.
Organized the way your finances actually break down — not by what’s trending in search.
Not Sure Which Calculator You Need?
Start from what you’re actually trying to decide.
Four common situations, and the calculators that answer them in order.
Figure out what you can actually afford
Start with affordability, then payment, then amortization and refinancing.
See the path → Taking a loanKnow the payment before you sign
Compare a general loan against a personal loan, side by side.
See the path → Growing savingsSee what consistency actually earns
Project compound growth, then check it against inflation and simple interest.
See the path → Running a businessPrice it right, know your break-even
Size a business loan, then check break-even, markup, and profit margin.
See the path →Try It Live
The calculator above is real — not a mockup.
Move any slider and the future value, contribution total, and interest earned recalculate instantly using the standard monthly-compounding formula. Scroll back up, or open the full version for a year-by-year schedule and downloadable table.
How We Calculate
Nothing here is a black box.
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01
Every formula is published
Each calculator page shows the exact equation behind the result, not just the number.
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02
No ads inside the math
Results, inputs, and schedules are never interrupted by placements designed to look like part of the tool.
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03
Reviewed against known references
Outputs are checked against textbook TVM formulas and standard amortization tables, not just “it looks right.”
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04
Updated when the rules change
Tax brackets, contribution limits, and rate assumptions are dated so you know what year they reflect.
“A calculator that hides its own math is just asking you to trust it. We’d rather show the work and let you check it.”
Methodology · VerifiedRun your numbers before your next decision.
Free, fast, and no account required — start with any of the 19 calculators.