CalcWise
Financial calculators for loans, mortgages, and investing
Free Online Calculators
Calculators are most of what people look for when they need a quick online tool. This shelf pulls every calculator in the library together, whatever its category: money, health, home projects, school math, dates and time.
A calculator is only as good as its formula. The better ones here show their working or name the method they use (for example Mifflin-St Jeor for calorie needs, or the standard amortization formula for loans). Treat health and money results as estimates, not advice.
Start with these
- CalcWise Offers calculators for mortgages, loans, and investments, including compound interest and ROI.
- BudgetBuddy Applies the 50/30/20 rule or a custom breakdown, logs expenses, and offers printable budget templates.
- TaxWiser Provides tax calculators for federal income tax, refund estimates, tax brackets, self-employment tax, and state taxes.
73 tools shown
Money planning
Use these when you want to budget, borrow, invest, or estimate taxes.
Health and fitness
Use these for body metrics, exercise, sleep, and other personal health checks.
Home and project math
Use these for renovation, building, cooking, and other project calculations.
Time and dates
Use these when you need date ranges, schedules, or timezone help.
Science and study
Use these for stats, STEM formulas, and homework-style step-by-step solving.
Identity and reference
Use these for size matching, relationships, passwords, and other lookup-style helpers.
Other tools on this shelf that do a specific job.
Questions about Free Online Calculators
Do these calculators store what I type?
Most run entirely in your browser, so the numbers never leave your device. Tools tagged "privacy-first" say so explicitly.
How accurate are online calculators?
The arithmetic is exact. The result is only as accurate as the formula and your inputs, so double-check units (lb vs kg, monthly vs annual rate).
Can I use them on my phone?
Yes. They are ordinary web pages and work in any modern mobile browser.