Mortgage Calculator
Estimate monthly payment, interest, and amortization.
Powerful Calculators for Real-World Decisions
Compare loans, investments, savings, and everyday costs instantly with hundreds of free calculators.
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Loan Calculator
Payment, payoff timeline, APR, and balance.
Compound Interest Calculator
Project growth with contributions and compounding.
Percentage Calculator
Percent of value, ratio, and percent change.
Rent vs Buy Home (Advanced)
Compare renting versus buying costs with equity and timeline assumptions.
Opportunity Cost Calculator
See what recurring spending could become if invested over time.
Concrete Calculator
Estimate slab volume, waste-adjusted order size, and bag counts.
Electricity Cost Calculator
Convert usage and utility rates into daily, monthly, and annual costs.
Trending calculators this week
BMI Calculator
Check body mass index with height and weight inputs.
Refinance Break-Even Calculator
See when closing costs are recovered and savings begin.
Hourly to Salary Calculator
Convert hourly pay to annual salary and compare income scenarios.
EV Cost Calculator
Compare annual EV charging and gas-cost differences.
Tip Calculator
Split bills and calculate tip amounts for any party size.
Calorie Calculator
Estimate daily calorie needs based on activity level and goals.
Financial Decision Calculators
High-impact calculators for real-life tradeoffs — money, time, and long-term outcomes.
Opportunity Cost / Spend vs Invest
Model what repeat spending could grow into under different return assumptions.
OpenSubscription Cost + Invest Instead
Measure recurring subscription spend versus invest-instead opportunity value.
OpenCommute Cost + Time Value
Combine fuel, operating, and time-value costs for a realistic commute estimate.
OpenRefinance Break-Even (Elite)
Find break-even timing and net savings across 1, 3, 5, and 10-year horizons.
OpenPay Off Debt vs Invest (Elite)
Compare debt-first and invest-first paths with timeline and net-worth projections.
OpenPopular Categories
Browse category hubs or jump straight to a tool from search above.
🏠 Mortgage Calculators
Payment, refinance, payoff, equity, and amortization tools.
💳 Loan Calculators
Compare loan payments, timelines, interest, and refinancing scenarios.
📈 Investment Calculators
Project growth, returns, compounding, and retirement milestones.
🧾 Debt Calculators
Build payoff strategies and compare debt reduction approaches.
🪵 Construction Calculators
Estimate materials, waste, and order quantities for project planning.
⚡ Utilities & Energy Calculators
Estimate electricity, heating, solar savings, and water usage cost.
❤️ Health Calculators
Check body metrics, calorie needs, and performance estimates.
🧮 Math & Conversion Calculators
Solve percentages, scientific math, and everyday unit conversions.
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Subscription Cost + Invest
Measure recurring subscription spend and potential invest-instead value.
Why MasterCalcs
Accurate formulas + clear assumptions
Fast, client-side compute
Clean breakdowns + shareable results
Use MasterCalcs when you need a quick mortgage calculator check, long-horizon compound interest calculator planning, or a side-by-side rent vs buy calculator decision. For project planning, the concrete calculator helps estimate order volume before purchase.