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Finance, health, math and conversion calculators built on peer-reviewed formulas. Results appear as you type. Nothing stored or sent.

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Finance
Mortgage, loans, investment, retirement, tax
21 tools
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Health
BMI, calories, body fat, heart rate, pregnancy
12 tools
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Math
Scientific, statistics, dice, password, random
8 tools
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Converters
Length, weight, temperature, volume, speed
23+ tools
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Date & Time
Age, countdown, date difference, world time
28+ tools
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Live Tools
World population, debt clock
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Most Popular Calculators

Health
BMI Calculator
Body Mass Index with WHO chart. Metric and imperial.
Visual gauge
 Finance
Mortgage Calculator
Monthly payment with PITI breakdown and amortization.
PITI · Schedule
 Finance
Compound Interest
Future value with contributions and growth chart.
Chart · PDF
 Date
Age Calculator
Exact age live in years, months, days and seconds.
Live counter
 Math
Scientific Calculator
Sin, cos, tan, log, powers, roots. Keyboard support.
Keyboard
 Convert
Celsius to Fahrenheit
Instant C to F with formula and reference table.
Bidirectional
 Live
US Debt Clock
Live national debt ticking every second. 9 countries.
Live · 9 countries
 Live
World Population
Live population counter with UN projections to 2100.
Live · Charts
 Finance
Currency Converter
Live rates for 150+ currencies via ECB.
150+ currencies
 Finance
Retirement Calculator
Nest egg, income gap and savings rate analysis.
Gap analysis

Why use FCalculator.com

✓ Real formulas

Every calculator is built on peer-reviewed equations from WHO, CDC, NIH and standard actuarial practice. Sources are cited in each tool.

✓ 100% private

All calculations run in your browser. Nothing is sent to our servers. No cookies used for tracking. No account required.

✓ Always free

No premium plans, no credits, no paywalls. Every tool is free forever. We are funded by non-intrusive advertising.

✓ Export ready

PDF and Excel export is built into every finance and health calculator so you can save and share results.