Free Online Calculators & Tools
76 free tools for finance, math, unit conversion, AI productivity, text editing, and health. No signup, no installs, no paywall — just results.
Browse by category
Finance Tools
Mortgage, loan, retirement, savings, credit card payoff, ROI, salary, refinance, dividend, bond, budget, debt payoff
20 toolsMath Tools
Percentage, scientific, fraction, age, date, random number
6 toolsUnits Converter
Power, energy, pressure, data size, fuel economy, cooking, torque, frequency, angle
10 toolsConverters
Unit, currency, temperature, color, base64, time zone, number base
7 toolsAI Tools
AI calculator, productivity, prompts, hashtag, email subject, rewriter
6 toolsText Tools
Word counter, character counter, case converter, text reverser
4 toolsHealth Tools
BMI, calorie/TDEE, body fat, water intake
4 toolsBusiness Tools
Amazon FBA/FBM profit, ecommerce margin, dropshipping, trading, reselling, wholesale, forex — plus a product image resizer
8 toolsPopular right now
Mortgage Calculator
Monthly payment with property tax, insurance, PMI, HOA. Full amortization.
Open →Compound Interest
Future value with monthly contributions. Year-by-year breakdown.
Open →Salary Calculator
Hourly ↔ yearly, monthly, weekly, bi-weekly. Plan your paychecks.
Open →Percentage Calculator
6 modes — what percent, % of, % change, % increase/decrease.
Open →Scientific Calculator
sin/cos/tan/log/ln/exp/fact. RAD/DEG modes. Keyboard input.
Open →Currency Converter
Live ECB exchange rates. 30+ world currencies.
Open →Investment Calculator
Project portfolio growth with contributions and compounding.
Open →401(k) Calculator
Retirement savings with employer match and tax-deferred growth.
Open →Why CalcLabHub?
100% free
Every tool is free, no signup required.
Privacy first
Runs locally in your browser. Nothing uploaded.
Mobile friendly
Works great on phones, tablets, desktops.
Fast & accurate
Validated formulas, instant results.
From the blog
How to Calculate Your Mortgage Payment
Step-by-step breakdown of principal, interest, taxes, and insurance.
Read →Compound Interest Explained
Why your money can grow exponentially — with real numbers.
Read →Rent vs Buy: How to Decide
A practical framework (with calculator) to choose what's right for you.
Read →How to Write ChatGPT Prompts That Work
A beginner-friendly framework for better AI conversations.
Read →