Free Online Calculators

The tools you need to run the numbers — in seconds, not spreadsheets.

From property tax estimates to FIRE planning, debt strategies to strength benchmarks — CalcHeadquarters is a growing library of fast, accurate, no-sign-up calculators.

Browse Calculators

Finance & Money

— 12 Calculators
Retirement
FIRE Number Calculator
Find the exact investment total you need to retire early using the 4% rule. Plan your path to financial independence.
Estimate • 2 min →
Real Estate
Property Tax Estimator
Estimate annual property taxes for any U.S. state. Covers all 50 states plus DC with local rate averages.
Estimate • 1 min →
Debt
Debt Payoff Calculator
Compare avalanche vs. snowball strategies side-by-side with interactive charts and a full month-by-month schedule.
Estimate • 3 min →
Retirement • Variant
Lean FIRE Calculator
Calculate the leaner FIRE number for those targeting a minimalist early retirement on a smaller annual budget.
Estimate • 2 min →
Retirement • Variant
Coast FIRE Calculator
Find the amount you need invested today to coast to traditional retirement without contributing another dollar.
Estimate • 2 min →
Retirement • Variant
Barista FIRE Calculator
Plan a hybrid early retirement where part-time income covers the gap until your full FIRE number kicks in.
Estimate • 2 min →
Retirement • Variant
Fat FIRE Calculator
Calculate the larger FIRE target for an early retirement with a substantially higher annual spending budget.
Estimate • 2 min →
Investing
Compound Interest Calculator
See how deposits and contributions grow over time with compound interest. Adjust rate, frequency, and timeline.
Estimate • 1 min →
Real Estate
Mortgage Payment Calculator
Estimate monthly mortgage payments including principal, interest, taxes, insurance, and PMI.
Estimate • 2 min →
Real Estate
Refinance Break-Even
Calculate when refinancing pays off by comparing monthly savings against closing costs.
Estimate • 1 min →
Savings
Emergency Fund Calculator
Set a target emergency fund based on your monthly expenses and track how close you are.
Estimate • 1 min →
Taxes
Capital Gains Tax
Estimate federal capital gains tax on stocks, crypto, or real estate by holding period and income.
Estimate • 1 min →
Property Tax by State
Texas California Florida New York New Jersey Illinois Ohio Pennsylvania Georgia Colorado · All 50 states + DC →

Business

— 11 Calculators
Freelancing
Freelance Rate Calculator
Set the right hourly or project rate based on your target income, billable hours, and overhead. Eight industry-specific versions available.
Estimate • 3 min →
Freelancing • Variant
Developer Rate
Hourly and project-rate calculator tuned for freelance software developers, with industry benchmarks by experience level.
Estimate • 2 min →
Freelancing • Variant
Web Designer Rate
Pricing calculator for freelance web designers with project-based and retainer modeling.
Estimate • 2 min →
Freelancing • Variant
Graphic Designer Rate
Set rates for branding, illustration, and design work with realistic industry benchmarks.
Estimate • 2 min →
Freelancing • Variant
Writer Rate
Per-word, per-hour, and per-project rate guidance for freelance writers and copywriters.
Estimate • 2 min →
Freelancing • Variant
Consultant Rate
Set day rates and retainer pricing for independent consulting work across business specialties.
Estimate • 2 min →
Freelancing • Variant
Photographer Rate
Build pricing for sessions, events, and commercial photography with gear and editing time factored in.
Estimate • 2 min →
Freelancing • Variant
Video Editor Rate
Per-minute, per-hour, and project rate calculator for freelance video editors and motion designers.
Estimate • 2 min →
Freelancing • Variant
Social Media Manager Rate
Monthly retainer and project pricing calculator for freelance social media managers and strategists.
Estimate • 2 min →
Analysis
Break-Even Calculator
Find the exact number of units you need to sell to cover fixed and variable costs and start profiting.
Estimate • 1 min →
Analysis
Profit Margin Calculator
Calculate gross, operating, and net margins with a visual breakdown of where every revenue dollar goes.
Estimate • 1 min →

Career

— 04 Calculators
Income
Pay Raise Calculator
Calculate your raise as a percentage, and see whether it actually beats inflation with side-by-side comparison bars.
Estimate • 1 min →
Income
Salary to Hourly Converter
Convert between annual salary and hourly rate. Adjustable hours and weeks for accurate comparisons.
Estimate • 30 sec →
Offers
Job Offer Comparison
Compare two job offers side by side on salary, bonus, benefits, and total compensation.
Estimate • 3 min →
Income
Total Compensation
Add up base, bonus, equity, 401(k) match, and benefits to see your true total comp package.
Estimate • 2 min →

Fitness & Strength

— 07 Calculators
Strength
One Rep Max Calculator
Estimate your 1RM from any set using proven formulas. Dedicated pages for bench, squat, deadlift, and overhead press.
Estimate • 30 sec →
Strength • Variant
Bench Press 1RM
Bench-press-specific one rep max calculator with strength standards by bodyweight and experience level.
Estimate • 30 sec →
Strength • Variant
Squat 1RM
Calculate your squat one rep max and see where you rank against lifters of your weight and training age.
Estimate • 30 sec →
Strength • Variant
Deadlift 1RM
Estimate your deadlift one rep max with strength benchmarks for untrained through elite lifters.
Estimate • 30 sec →
Strength • Variant
Overhead Press 1RM
Dial in your overhead press 1RM and compare against pressing standards by bodyweight.
Estimate • 30 sec →
Nutrition
Macro Calculator
Get daily calorie, protein, carb, and fat targets based on your stats, activity level, and goal.
Estimate • 1 min →
Body Composition
BMI Calculator
Check your body mass index with a visual scale, healthy weight range, and full BMI chart. Imperial and metric.
Estimate • 30 sec →

Built for people who just need the number.

— 01
No sign-up required
Every tool works instantly. No email gates, no accounts, no paywalls.
— 02
Fast and accurate
Calculations update in real time as you type. Results in under a second.
— 03
Location-aware
State-specific versions for tools where your location changes the answer.
— 04
Always expanding
New calculators are added regularly. Bookmark the site and check back.