All calculators (393)
From mortgage repayments and compound interest to BMI, percentages, concrete volume and calculus — 210 free calculators spanning finance, health, fitness, math, construction, home and everyday life. Every result shows the formula behind it and cites its source, works in metric or imperial units, and runs instantly in your browser. No signup, no clutter, completely private.
Free, science-backed calculators — transparent formulas, cited sources, no tracking of your inputs.
Money & Finance (161)
Loan, savings, investing and planning calculators using standard amortization mathematics, transparent assumptions and cited conventions.
Mortgage
- 🏠 Mortgage Calculator
- 📉 Amortization Calculator
- 🔑 Mortgage Affordability Calculator
- 🔄 Refinance Calculator
- 🏠 USA Mortgage Calculator
- 🏠 UK Mortgage Calculator
- 🏠 South Africa Bond Calculator
- 🏠 Australia Mortgage Calculator
- 🏠 Canada Mortgage Calculator
- 🏠 India Home Loan Calculator
- 🏠 Germany Mortgage Calculator
- 🏠 China Mortgage Calculator
- ⏸️ Interest-Only Mortgage Calculator
- 🎈 Balloon Mortgage Calculator
- 📆 Biweekly Mortgage Calculator
- 📊 ARM Calculator
- 🔽 Mortgage Points Calculator
- 🏗️ Construction Loan Calculator
- 🌉 Bridge Loan Calculator
- 🏁 Mortgage Payoff Calculator
- ➕ Extra Mortgage Payment Calculator
- 🏦 HELOC Calculator
- 🏠 Home Equity Loan Calculator
- 🆚 Mortgage Comparison Calculator
Loans
- 💰 Credit Card Payoff Calculator
- 💳 Loan Calculator
- 🚙 Car Loan Calculator
- ⛓️ Debt Payoff Calculator
- 🤝 Personal Loan Calculator
- 🗓️ EMI Calculator
- 🔍 APR Calculator
- ⚖️ Debt-to-Income (DTI) Calculator
- 🏭 Business Loan Calculator
- 🎓 Student Loan Calculator
- 🧩 Debt Consolidation Calculator
- ☃️ Debt Snowball Calculator
- 🏔️ Debt Avalanche Calculator
- 💳 Credit Card Interest Calculator
- 🐌 Credit Card Minimum Payment Calculator
- 📉 Credit Utilization Calculator
- 🆚 Loan Comparison Calculator
- 🔄 Balance Transfer Calculator
- 🧮 Remaining Loan Balance Calculator
- 🧾 Finance Charge Calculator
- 📄 Lease Calculator
- 🚗 Auto Lease Calculator
- 🚘 Car Affordability Calculator
Investing
- 📈 Compound Interest Calculator
- 📊 IRR Calculator
- 🌱 Investment Calculator
- 🎯 ROI Calculator
- ⏩ Future Value Calculator
- ⏪ Present Value Calculator
- 📐 CAGR Calculator
- 💸 Dividend Calculator
- 🧮 NPV Calculator (Net Present Value)
- 🏷️ DCF Calculator (Discounted Cash Flow)
- ↩️ Payback Period Calculator
- 🧾 Bond Calculator (Bond Price)
- 📉 Bond Yield Calculator (Yield to Maturity)
- 🪙 Investment Fee Calculator (Fee Drag)
- 🏷️ Expense Ratio Calculator
- 🎲 Expected Return Calculator (Portfolio)
- 📊 Average Annual Return Calculator (CAGR)
- 🪴 Mutual Fund Calculator (SIP Growth)
- 💹 Stock Profit Calculator
- ⚖️ Stock Average Calculator (Average Cost Basis)
- 🧭 Profitability Index Calculator
- 🎈 Real Rate of Return Calculator
- 📐 Sharpe Ratio Calculator
- ✂️ Stock Split Calculator
- 🔬 P/E Ratio Calculator
- 🧾 EPS Calculator
- 🏛️ Enterprise Value Calculator
- ⚖️ EV/EBITDA Calculator
- 🧪 WACC Calculator
- 💰 Dividend Payout Ratio Calculator
Savings
- 💎 Net Worth Calculator
- 🧾 Simple Interest Calculator
- 🎈 Inflation Calculator
- 🐖 Savings Calculator
- 🗂️ Budget Calculator
- 🥧 50/30/20 Budget Calculator
- 🎯 Savings Goal Calculator
- 📈 APY Calculator
- 🧮 Effective Annual Rate (EAR) Calculator
- 🔒 CD Calculator
- 🏧 Savings Withdrawal Calculator
- 🪣 Sinking Fund Calculator
- 🚨 Emergency Fund Calculator
- 🔀 Opportunity Cost Calculator
Business
- 🏪 Profit Margin Calculator
- 🏷️ Markup Calculator
- ⚖️ Break-Even Calculator
- 🧩 Contribution Margin Calculator
- 📦 COGS Calculator (Cost of Goods Sold)
- 🗃️ Business Budget Calculator
- 🔥 Burn Rate Calculator
- 🛫 Cash Runway Calculator
- 🏦 Business Valuation Calculator
- 🤝 Sales Commission Calculator
- 🖥️ Website Ad Revenue Calculator
- 👷 Labor Cost Calculator
- 🧑🤝🧑 Revenue per Employee Calculator
- 🔁 Inventory Turnover Calculator
- 📦 EOQ Calculator (Economic Order Quantity)
- 🏪 Cost of Doing Business Calculator
Real Estate
- 💰 Down Payment Calculator
- 📊 Loan-to-Value (LTV) Calculator
- 🏢 Cap Rate Calculator
- 🧾 Net Operating Income (NOI) Calculator
- 🏘️ Rental Property Calculator
- 💵 Rental Cash Flow Calculator
- 🔑 Rent Affordability Calculator
- 🤔 Rent vs. Buy Calculator
- 📐 Price per Square Meter Calculator
- 📏 Price per Square Foot Calculator
- 🤝 Real Estate Commission Calculator
Marketing & SaaS
- 🧲 Customer Acquisition Cost (CAC) Calculator
- 💎 Customer Lifetime Value (CLV) Calculator
- 🚪 Churn Rate Calculator
- 📟 SaaS Metrics Calculator (MRR, ARR & NRR)
- 📣 ROAS Calculator (Return on Ad Spend)
- 🎯 Conversion Rate Calculator
- 💰 CPA Calculator (Cost Per Acquisition)
- 📊 Ad Metrics Calculator (CPM, CPC, CTR, CVR & CPA)
- ⏱️ Customer Payback Period Calculator (CAC Payback)
Accounting
- 📉 Depreciation Calculator
- 🏢 EBITDA Calculator
- 🧾 EBIT Calculator
- 💧 Free Cash Flow Calculator
- 🧮 Net Income Calculator
- 🌊 Current Ratio Calculator
- ⚡ Quick Ratio Calculator
- 🏗️ Debt-to-Equity Ratio Calculator
- 🛡️ DSCR Calculator
- 🧯 Interest Coverage Ratio Calculator
- 🏦 ROA Calculator
- 📈 ROE Calculator
- 🎯 ROIC Calculator
- 🔄 Asset Turnover Calculator
- 💼 Working Capital Calculator
Health (25)
Body composition, nutrition, pregnancy and heart-health calculators based on WHO, NHS, ACOG and ACSM reference standards.
Fitness (20)
Training calculators for runners, cyclists, swimmers and lifters — validated formulas from sports science literature.
Education & Math (57)
Math and statistics calculators with step-by-step formulas and worked examples for students and professionals.
Statistics
- μ Mean Calculator
- 𝑀 Median Calculator
- σ Standard Deviation Calculator
- 🎲 Probability Calculator
- 🧪 Sample Size Calculator
- 📏 Confidence Interval Calculator
- 𝑍 Z-Score Calculator
- 🔔 Normal Distribution Calculator
- 🎯 Binomial Distribution Calculator
- 🧾 T-Test Calculator
- χ² Chi-Square Test Calculator
- 📉 Correlation Calculator
- 🔄 Bayes' Theorem Calculator
Home Improvement (12)
Project estimation calculators with industry-typical coverage values you can adjust to your materials.
Construction (76)
Material quantity calculators using standard densities and coverage rates, with sensible waste margins.
Framing & Drywall
- 🪚 Stud Wall Calculator
- ◻️ Drywall Calculator
- 🧊 Insulation Calculator
- 🪜 Stair Calculator
- 🧻 Wallpaper Calculator
- ▦ Paver Calculator
- 🚧 Fence Calculator
- 🪵 Decking Calculator
- 📋 Plywood Calculator
- 🪜 Floor Joist Calculator
- 📏 Beam Span Calculator
- 🏋️ Beam Load Calculator
- ↩️ Beam Deflection Calculator
- 🚪 Door Header Calculator
- 🔺 Roof Truss Calculator
- 🚧 Baluster Spacing Calculator
- 📐 Miter Angle Calculator
Concrete & Masonry
- 🏗️ Cement Calculator
- 🥣 Concrete Mix Ratio Calculator
- 🧲 Rebar Calculator
- 🧊 Concrete Block Fill Calculator
- 🏛️ Concrete Column Calculator
- 🛢️ Sonotube Calculator
- 🕳️ Post Hole Concrete Calculator
- 🪜 Concrete Stair Calculator
- 🧱 Mortar Calculator
- 🔲 Grout Calculator
- 🥄 Thinset Calculator
- 🛣️ Concrete Driveway Cost Calculator
- ⚖️ Concrete Weight Calculator
- 💵 Concrete Slab Cost Calculator
- 🦶 Concrete Footing Calculator
Automotive (3)
Driving-cost and fitment calculators with metric and imperial unit conversions built in.
Technology (6)
Data, networking and number-system calculators for developers, admins and students.
Engineering (12)
Electrical and mechanical engineering calculators using standard physical constants, cited on every page.
Cooking & Baking (5)
Kitchen conversion calculators built on published ingredient densities and baker's percentages.
Everyday Tools (16)
Quick daily-life calculators: dates, times, travel budgets, tips and currency conversions.