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Free tools for freelancers, homeowners, car buyers, and anyone who wants to figure things out without paying $40/month.

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BMI Calculator Mortgage Calculator Tip Calculator Salary Calculator Sleep Calculator Percentage Calculator Car Payment Calculator Tire Size Calculator Calorie Calculator Unit Converter Age Calculator Poker Odds Calculator Compound Interest BMI Calculator Mortgage Calculator Tip Calculator Salary Calculator Sleep Calculator Percentage Calculator Car Payment Calculator Tire Size Calculator Calorie Calculator Unit Converter Age Calculator Poker Odds Calculator Compound Interest

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🤺Health & Body9 tools

Calculate your Body Mass Index and see your healthy weight range instantly.

Calorie & TDEE Calculator

Find your daily calorie needs for weight loss, maintenance, or muscle gain. With macro targets.

Sleep Calculator

Find the best wake up time based on 90-min sleep cycles. Wake up refreshed every morning.

Period & Ovulation Tracker

Predict your next period, fertile window, and ovulation day. No app, no account, nothing stored.

Womens health→

Pregnancy Due Date Calculator

Estimate your due date, current week, and trimester from your last period or conception date.

Womens health→

Macro Split Calculator

Get exact protein, carb, and fat grams for balanced, high-protein, low-carb, or keto diets.

One-Rep Max Calculator

Estimate your true 1RM from any weight and rep count, plus a training percentage table.

Target Heart Rate Calculator

Find your training heart rate zones for fat burning, cardio, and peak effort.

Race Pace Calculator

Pace, finish time, or mile splits for 5K, 10K, half, or full marathon.

🌟Everyday Math8 tools

Calculate tips and split the bill. Adjustable percentage with per-person breakdown.

Percentage Calculator

4 types of percentage math solved instantly. What is X% of Y? Percentage change? And more.

Your exact age in years, months, days, and hours. Plus days until your next birthday.

Length, weight, temperature, volume, speed, area — all conversions in one place.

Password Checker & Generator

Check password strength or generate a secure one. Runs entirely in your browser, nothing stored.

Add your courses and credit hours to calculate weighted or cumulative GPA.

Currency Converter

Convert between 30+ world currencies with live daily exchange rates.

QR Code Generator

Turn any link, text, or Wi-Fi login into a scannable QR code. Download as PNG instantly.

📈Finance & Money9 tools

Mortgage Calculator

Monthly payment, total interest, and full amortization schedule. Includes tax and insurance.

Personal Loan Calculator

Any loan type. See monthly payments and total interest. Compare different term lengths.

Compound Interest Calculator

See how money grows over time. Year-by-year growth table with monthly contributions.

Salary & Take-Home Pay

Calculate your real paycheck after federal taxes, state, Social Security, 401k, and insurance.

Home Affordability Calculator

See the maximum home price you can afford using the standard 28/36 debt-to-income rule.

Debt Payoff Planner

Compare the snowball and avalanche methods to see which pays off your debt faster.

Student Loan Payoff Calculator

See when you will be debt-free and how much extra payments save you.

Retirement Calculator

Project your retirement savings growth, adjusted for inflation, plus estimated monthly income.

Net Worth Calculator

Add up your assets and liabilities to see your total net worth, privately.

💼Freelance & Career7 tools

Proposal Generator

Polished project proposal in 2 minutes. Fill, live preview, download as PDF.

Invoice Builder

Professional invoices with line items, tax, and due dates. Print or save as PDF.

Hourly Rate Calculator

Stop undercharging. Get the exact hourly rate you need to hit your income goals.

Cold Email Writer

Get 3 personalized cold email versions instantly. Multiple tones and CTAs.

LinkedIn, Twitter, Upwork, Instagram — optimized bios for every platform.

Personal brand→

Resume Bullet Writer

Paste duties, get ATS-friendly resume bullets with action verbs that get interviews.

Freelance & 1099 Tax Estimator

See your self-employment tax, federal tax, and what to set aside each quarter.

🚗Cars & Driving8 tools

Car Payment Calculator

Monthly payments, total interest, and true ownership costs including gas and insurance.

Gas & MPG Calculator

Real monthly fuel cost and how much a more efficient car would save you per year.

Tire Size Calculator

Find equivalent tire sizes for any wheel diameter and see the exact speedometer error.

Decode any 17-character VIN to see the make, model, year, engine, and plant of origin.

Car Depreciation Calculator

See what a new or used car will be worth 1, 5, or 10 years from now.

Lease vs. Buy Calculator

Compares true net cost of leasing vs buying over the same time period.

True Cost of Ownership

Depreciation, fuel, insurance, maintenance, and interest — combined into one annual number.

Out-the-Door Price Calculator

Real total price with sales tax by state, trade-in credit, and dealer fees included.

🏠Home & Real Estate4 tools

Home Renovation ROI

Which renovations pay off? Return rates for kitchens, baths, roofs, decks, and 14 more.

Home improvement→

Paint Calculator

Exact gallons for any room. Multi-room support with automatic shopping list generator.

Home improvement→

Solar Panel Savings Calculator

Estimate system size, cost after tax credit, and payback period based on your electric bill.

Home improvement→

Rent vs. Buy Calculator

See the true net cost of renting vs buying over time, including opportunity cost.

🎲Fun & Entertainment3 tools

Gambling Odds Calculator

Expected value, house edge, and session projections. Know the math before you bet.

Entertainment→

Poker Odds Calculator

Enter hole cards and board. Win probability, pot odds, and hand equity instantly.

Typing Speed Test

Measure your words per minute and accuracy instantly. Unlimited retries, no signup.

🍴Cooking & Kitchen5 tools

Scale any recipe up or down to a new serving size, with fractions handled automatically.

Cooking Measurement Converter

Convert cups, tablespoons, and grams for real ingredients, each with correct density.

Butter Converter

Sticks, cups, grams, and tablespoons — every unit at once.

Oven Temperature Converter

F, C, and gas mark all at once, with a fan/convection adjustment.

Recipe Cost Calculator

Add ingredient prices and see exactly what a recipe costs per serving.

✍Text & Writing5 tools

Word & Character Counter

Words, characters, sentences, paragraphs, and reading time — updated live as you type.

UPPERCASE, lowercase, Title Case, Sentence case, camelCase, or snake_case in one click.

Readability Checker

Get a Flesch Reading Ease score and estimated grade level for any text.

Headline Analyzer

Score your headline for length, power words, and emotional appeal, no email required.

Text Diff Checker

Compare two blocks of text and see exactly what was added or removed.

🛒Shopping & Deals2 tools

Discount Calculator

Stack multiple discounts and see the real final price — it's not just addition.

Unit Price Comparator

Compare price per unit across package sizes to find the actual better deal.

🐕Pets1 tool

Dog & Cat Age Calculator

Real human-equivalent age using modern non-linear formulas, not the outdated ×7 myth.

💬Feedback & Support2 links

Something broken? Let us know exactly what and where.

Got a problem? Tell us and we will build it free for everyone.

💼

Need freelance clients?

Fiverr connects you with thousands of buyers. List your services free.

Explore Fiverr →

🏠

Ready to buy a home?

LendingTree compares mortgage rates from multiple lenders in minutes.

Compare rates →

🚗

Shopping for a car?

CarGurus shows real market prices from every dealer near you.

Search cars →

Why DIY9lives

Other tools charge $40/month
for this stuff.

01

Actually free

No trial. No credit card. No "3 free uses." Open it, use it, done.

02

No account needed

No login walls. No data selling. Just open the tool and use it.

03

Built for real people

Not enterprise bloatware. Each tool does one thing fast.

04

New tools monthly

We build what people request. Got a problem? Tell us.

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