36 Free Calculators

Boring Math
Made Easy

Free, beautiful calculators for freelancers, planners, and anyone who needs quick answers to everyday math problems. Fast. Free. Easy.

36
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Results
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Income

Go Full-Time Calculator

Calculate when you can quit your job to pursue freelancing or side hustle full-time.

Most Used
Finance

FIRE Calculator

Calculate your path to Financial Independence, Retire Early with Lean, Fat, and Coast FIRE projections.

Most Used
Health

BMI Calculator

Calculate your Body Mass Index and see healthy weight ranges.

Most Used
Everyday

Percentage Calculator

Calculate percentages, percent change, and more with instant results.

Most Used
Health

Calorie Calculator

Calculate your daily calorie needs (TDEE) based on activity level and goals.

Most Used
Finance

Mortgage Calculator

Calculate monthly payments, total interest, and loan costs for your home.

Most Used
Finance

Loan Calculator

Calculate monthly payments and total interest for any loan.

Finance

Compound Interest

See how investments grow over time with the power of compound interest.

Most Used
Everyday

Tip Calculator

Calculate tips instantly and split bills between friends with ease.

Everyday

Unit Converter

Convert between length, weight, temperature, volume, and more.

Everyday

Age Calculator

Calculate your exact age in years, months, days with zodiac signs.

Income

Freelance Day Rate

Calculate your ideal freelance rate vs salary position, including tax adjustments and benefits analysis.

Income

Hourly to Salary

Convert hourly rate to annual salary with tax adjustments and take-home pay.

Income

Raise Calculator

See the lifetime value of salary increases and career compounding.

Income

Contractor vs Employee

Compare contractor rates vs salary accounting for taxes, benefits, and hidden costs.

Income

Remote Work Savings

Calculate how much you save working from home - gas, time, food, and more.

Finance

Savings Goal

Calculate monthly contributions to reach your savings goal with inflation.

Finance

Emergency Fund

Calculate your ideal emergency fund size based on expenses and stability.

Finance

Debt Payoff Calculator

Compare snowball vs avalanche strategies to pay off debt faster.

Business

Side Hustle Profit

Determine if your side hustle is truly profitable with effective hourly rate.

Business

Etsy/eBay Fee Calculator

Compare marketplace fees and calculate your net profit on Etsy vs eBay.

Business

Break-Even Point

Calculate how many units you need to sell to cover business costs.

Home

Paint Calculator

Calculate paint needed for any room with gallons and shopping list.

Home

Flooring Calculator

Calculate flooring needed with pattern-specific waste factors and box counts.

Home

Mulch Calculator

Calculate how much mulch you need in cubic yards or bags for your garden beds.

Home

Electricity Cost

Calculate appliance running costs - daily, monthly, and yearly.

Events

Wedding Alcohol

Estimate beer, wine, and liquor for your celebration based on guest count.

Events

BBQ Calculator

Calculate meat, sides, and supplies for your cookout or BBQ party.

Events

Party Drink Calculator

Estimate non-alcoholic drinks, juice, water, and ice for your party or event.

Everyday

Discount Calculator

Calculate sale prices, percent off, and total savings on any purchase.

Everyday

Dog Age Calculator

Convert dog years to human years using accurate, science-based formulas.

Engineering

Reynolds Number

Calculate Reynolds number to determine flow regime (laminar, transitional, turbulent).

Engineering

Ideal Gas Law (PV=nRT)

Calculate pressure, volume, moles, or temperature using the ideal gas law.

Engineering

Pipe Flow Calculator

Size pipes, calculate velocity, or flow rate with velocity recommendations.

Engineering

LMTD Calculator

Calculate Log Mean Temperature Difference for heat exchanger design.

Engineering

Pressure Drop Calculator

Calculate pipe pressure drop using Darcy-Weisbach equation with friction factors.

Why Boring Math?

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Made with Care

Every calculator is thoughtfully designed for real-world use cases and accuracy.

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