Free Online Calculators — Finance, Health & Home
59 free calculators for money, health, home, and more. Everything runs in your browser. No account needed, no paywalls, instant results.
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Finance Tools
Freelance Rate Calculator
Find the minimum hourly rate you need to charge — factoring in taxes, expenses, and realistic billable hours.
Compound Interest Calculator
Project long-term investment growth with optional monthly contributions and an interactive year-by-year chart.
ROI Calculator
Calculate return on investment, payback period, and the exact month you break even.
Debt Payoff Calculator
Compare avalanche vs snowball strategies and see exactly how much interest each one saves.
Emergency Fund Calculator
Get a cost-of-living-adjusted emergency fund target tailored to your city and household size.
Tip Calculator
Calculate the tip amount for any percentage and split the final bill evenly between any number of people.
Security Tools
Password Strength Checker
Analyse entropy and crack time for any password, with specific improvement suggestions.
Password Generator
Generate cryptographically random passwords with full control over length and character sets.
Hash Generator (SHA-256/512)
Produce SHA-256 or SHA-512 hashes from any input — instantly, with no server involved.
JWT Decoder
Decode JWT header and payload, inspect claims, and check token expiry — all client-side.
CIDR Subnet Calculator
Get network address, broadcast, subnet mask, host range, and usable host count for any CIDR block.
Marketing Tools
CPM Calculator
Calculate cost per thousand impressions and estimate total reach from any budget.
Customer Lifetime Value
Find your CLV and recommended acquisition budget based on margin and churn rate.
Churn Rate Calculator
Measure monthly, annual, and revenue churn — with MRR impact included.
Conversion Rate Calculator
Calculate conversion rate, revenue per visitor, and the uplift needed to hit targets.
Break-Even Calculator
Find the exact units and revenue needed to break even, with a month-by-month view.
Home Tools
Mortgage Calculator
See your monthly payment, total interest, and full amortization schedule side by side.
Rent vs Buy Calculator
Compare the true long-term cost of renting versus buying and find your break-even year.
Solar Panel Calculator
Estimate your payback period and 25-year savings before committing to solar.
Paint Calculator
Get exact gallons needed from room dimensions, doors, windows, and number of coats.
Electricity Cost Calculator
Break down your monthly electricity bill by appliance and find the biggest savings.
Health Tools
BMI Calculator
Calculate your Body Mass Index, see your category, and understand what it means for your health.
TDEE / BMR Calculator
Find your daily calorie target for maintaining, losing, or gaining weight — using the Mifflin-St Jeor formula.
Macro Calculator
Get personalised protein, carb, and fat targets for balanced eating, low-carb, or keto.
Running Pace Calculator
Calculate pace per mile or km and project finish times for your next race.
Calories Burned Calculator
Estimate calories burned across 15 activities by body weight and session duration.
Unit Converters
Temperature Converter
Convert °C, °F, Kelvin, and Rankine instantly.
Length Converter
Convert km, miles, feet, meters, and inches.
Weight Converter
Convert kg, lbs, stones, oz, and grams.
Speed Converter
Convert mph, km/h, m/s, knots, and Mach.
Data Storage Converter
Convert GB, MB, TB, KB, bits, and megabits.
Area Converter
Convert m², ft², acres, hectares, and sq miles.
Percentage Calculator
Find X% of a number, what percent, or % change.
Time & Date Tools
Days Between Dates
Calculate exact days, weeks, and months between any two dates.
Business Days Calculator
Count working days between dates, excluding weekends and holidays.
Add / Subtract Days
Find a future or past date by adding or subtracting any number of days.
Timezone Converter
Convert any time across 22 major world timezones at once.
Age Calculator
Find your exact age in years, months, days, and your next birthday.
How ToolHub Pro Builds and Verifies Its Calculators
Every calculator on ToolHub Pro starts with a primary source. Finance tools reference IRS publications, CFA Institute guidelines, and Federal Reserve rate tables. Health tools use formulas published by the CDC, WHO, and peer-reviewed nutrition journals. Security tools implement algorithms from NIST Special Publications. Unit converters use the official SI definitions maintained by the Bureau International des Poids et Mesures (BIPM). The formula is locked in from the primary source before any code is written.
Once implemented, each tool is tested against worked examples from the same primary source and against results from established institutions — the SEC’s own compound interest calculator, NHS BMI charts, NIST hash test vectors. Where a formula has variants (for example, Mifflin-St Jeor vs. Harris-Benedict for basal metabolic rate), we use the version with the strongest published evidence and explain the choice on the tool page. We link to every primary source so you can verify the mathematics yourself.
All calculations run entirely in your browser using JavaScript. No input — not your income, your health measurements, your passwords, or anything else — is transmitted to a server. This is a deliberate architectural decision, not just a privacy marketing claim: our servers never see your data because the code never sends it. You can verify this by checking your browser’s network tab while using any tool.
Who These Tools Are For
ToolHub Pro is designed for individuals making real financial, health, and home decisions who want to understand the numbers behind those decisions — not just a black-box output. A freelancer pricing a new contract, a first-time buyer comparing mortgage scenarios, someone starting a savings plan, a developer verifying a JWT token: these are the situations the tools are built for. Each tool page includes an explanation of the underlying formula, its assumptions and limitations, and references to the sources so you can dig deeper if you need to.
The tools are free, ad-supported, and require no account or sign-up. They are updated when underlying standards change — for example, when the IRS adjusts tax tables or when NIST revises cryptographic guidance. The “last updated” date shown on each tool page reflects the most recent formula or data revision.
Frequently Asked Questions
Are ToolHub Pro calculators free to use?▾
Yes. Every calculator on ToolHub Pro is completely free with no account, sign-up, or payment required. The site is supported by Google AdSense advertising.
Do you store the data I enter into calculators?▾
No. All calculations run entirely in your browser. No input data — including financial figures, health measurements, passwords, or personal details — is transmitted to any server. You can confirm this by checking your browser's network tab.
How accurate are the financial calculators?▾
Finance calculators use standard formulas from IRS publications, CFA Institute guidelines, and the Federal Reserve. Results are mathematical estimates for planning purposes. For binding financial decisions, consult a licensed financial adviser or CPA.
Are the health calculators medically approved?▾
Health tools use formulas published by the CDC, WHO, and peer-reviewed research. They are wellness estimation tools, not medical devices, and should not replace consultation with a healthcare provider.
How often are the calculators updated?▾
Each tool shows a "last updated" date. Tools are reviewed when underlying standards change — IRS tax table revisions, NIST cryptographic guidance updates, or WHO threshold changes.
Can I suggest a new calculator?▾
Yes — use the contact page. We prioritise tools where a clear primary-source formula exists and where the calculation helps with everyday decisions.