Free Calculators for Every Decision You Make
56 accurate, free tools for finance, health, home ownership, converters, and more. No sign-up. No paywalls. Results in seconds.
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Finance Tools
Freelance Rate Calculator
Find your minimum hourly rate accounting for taxes, expenses, and billable hours.
Compound Interest Calculator
Project investment growth with monthly contributions and an interactive chart.
ROI Calculator
Calculate return on investment, payback period, and break-even month.
Debt Payoff Calculator
Compare avalanche vs snowball strategies and see how much interest you save.
Emergency Fund Calculator
Get a cost-of-living-adjusted emergency fund target for your city.
Security Tools
Password Strength Checker
Analyze entropy, crack time, and get improvement suggestions instantly.
Password Generator
Generate cryptographically random passwords with custom options.
Hash Generator (SHA-256/512)
Generate SHA-256 or SHA-512 cryptographic hashes from any text.
JWT Decoder
Inspect JWT header, payload, and check token expiry client-side.
CIDR Subnet Calculator
Get network address, broadcast, subnet mask, and host count.
Marketing Tools
CPM Calculator
Calculate cost per thousand impressions for any ad campaign.
Customer Lifetime Value
Calculate CLV and recommended CAC based on margin and churn.
Churn Rate Calculator
Track monthly, annual, and revenue churn with MRR impact.
Conversion Rate Calculator
Calculate conversion rate, revenue per visitor, and target uplift.
Break-Even Calculator
Find break-even units, revenue, and month-by-month progress.
Home Tools
Mortgage Calculator
Calculate monthly payment, total interest, and year-by-year amortization.
Rent vs Buy Calculator
Compare renting vs buying over time and find your break-even year.
Solar Panel Calculator
Estimate payback period and 25-year savings for solar installation.
Paint Calculator
Calculate gallons needed from room dimensions, doors, windows, and coats.
Electricity Cost Calculator
See your estimated monthly bill broken down by appliance.
Health Tools
BMI Calculator
Calculate Body Mass Index and find your healthy weight range.
TDEE / BMR Calculator
Calculate daily calorie needs using the Mifflin-St Jeor formula.
Macro Calculator
Get protein, carbs, and fat targets for balanced, low-carb, or keto.
Running Pace Calculator
Calculate pace per mile/km and projected race finish times.
Calories Burned Calculator
Estimate calories burned for 15 activities by weight and 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.
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.