Mortgage Calculator
Estimate your monthly mortgage payment from loan amount, rate, and term.
OpenEveryday numbers. Better understood.
A little clarity.
A more informed decision.
Work out a payment, explore a scenario, or check the numbers. Free calculators with clear methods and practical examples.
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Loan Calculator
Compute monthly payment and total interest for a fixed-rate loan.
OpenInvestment Calculator
Future value of regular contributions with compound growth.
OpenBMI Calculator
Body Mass Index from height and weight (metric or imperial).
OpenPregnancy Due Date Calculator
Estimated due date from the first day of your last menstrual period.
OpenBasic Calculator
Add, subtract, multiply, and divide with a clean keypad.
OpenScientific Calculator
Trigonometry, logarithms, powers, and roots.
OpenPercentage Calculator
Find percentages, ratios, and percent change.
OpenBrowse by category
Financial Calculators
Mortgage, loans, debt, interest, and investment tools with clear formulas and illustrative £ / UK-style worked examples.
Health Calculators
BMI, calories, pregnancy due dates, and body composition estimates — educational screening math, not clinical advice.
Math Calculators
Basic arithmetic, scientific functions, and percentage calculations in your browser.
Conversion Calculators
Length, weight, temperature, and distance converters with exact factors, both directions, and quick-reference tables.
Guides worth reading before you trust a number
Understand the assumptions, compare scenarios, and see what a result leaves out.
Mortgage payment vs PITI
Why principal-and-interest is usually lower than the housing payment a lender discusses.
Read guideLoan amortization explained
Why early payments are mostly interest and how principal declines over time.
Read guideRefinance break-even
When a lower rate recovers closing costs — and when it does not.
Read guideDebt snowball vs avalanche
Pick a payoff order you will finish — cost-efficient or motivation-first.
Read guideEmergency fund sizing
Build a cash cushion from essential expenses and income risk.
Read guideAll calculators
Search above or browse the full list.
Mortgage Calculator
Estimate your monthly mortgage payment from loan amount, rate, and term.
Loan Calculator
Compute monthly payment and total interest for a fixed-rate loan.
Debt Payoff Calculator
See how long it takes to pay off a balance with your monthly payment.
Interest Calculator
Simple and compound interest growth on principal over time.
Investment Calculator
Future value of regular contributions with compound growth.
BMI Calculator
Body Mass Index from height and weight (metric or imperial).
Calorie Calculator
Estimate daily calories (BMR/TDEE) using the Mifflin–St Jeor equation.
Pregnancy Due Date Calculator
Estimated due date from the first day of your last menstrual period.
Body Fat Calculator
U.S. Navy method estimate using body measurements.
Basic Calculator
Add, subtract, multiply, and divide with a clean keypad.
Scientific Calculator
Trigonometry, logarithms, powers, and roots.
Percentage Calculator
Find percentages, ratios, and percent change.
Inches to Centimeters
Convert length between inches and centimeters.
Pounds to Kilograms
Convert weight between pounds and kilograms.
Fahrenheit to Celsius
Convert temperature between °F and °C.
Miles to Kilometers
Convert distance between miles and kilometers.
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