Loan payment
Plan a fixed-rate loan with a clear monthly payment and total interest.
Open Loan payment →Practical tools · Clear explanations
A useful answer.
A clear next step.
Calculate, compare and learn. These pages pair working tools with examples, methods and practical limits.
41 tools and guides
Money
Mortgage calculator
Plan a fixed-rate mortgage with flexible terms, ownership costs, extra payments and a full repayment schedule.
Open Mortgage calculator →Building
Flooring estimate
Estimate area, waste allowance and material cost.
Open Flooring estimate →Tile quantity
Estimate tile counts for a rectangular area.
Open Tile quantity →Paint quantity
Estimate paint from wall area and coverage.
Open Paint quantity →Concrete volume
Estimate material volume for a rectangular slab.
Open Concrete volume →Roof area & material estimate
Turn a roof’s horizontal footprint and pitch into sloped area and material quantity.
Open Roof area & material estimate →Gardening
Blueberry care guide
Berries. Soil, pH, moisture, harvest cues and gentle pest prevention.
Open Blueberry care guide →Strawberry care guide
Berries. Soil, pH, moisture, harvest cues and gentle pest prevention.
Open Strawberry care guide →Plant watering & soil tables
Compare care needs across berries, fruit trees, vegetables, herbs and shrubs.
Open Plant watering & soil tables →Mulch & soil volume
Estimate garden material from area and depth.
Open Mulch & soil volume →Food
Cups, fractions & grams
Convert 1 1/2 cups of flour—or other ingredients—to grams, with ingredient-specific weights.
Open Cups, fractions & grams →Sourdough starter: start, feed & troubleshoot
Build a flour-and-water starter, recognize readiness, maintain it and plan your first loaf.
Open Sourdough starter: start, feed & troubleshoot →Transportation
Trip fuel cost
Estimate fuel needed and total cost for a trip.
Open Trip fuel cost →More calculators with explanations
Interest Calculator
Calculate interest that does not compound.
Open Interest Calculator →Amortization Calculator
See how each payment reduces your balance.
Open Amortization Calculator →Compound Interest Calculator
Estimate growth with regular monthly deposits.
Open Compound Interest Calculator →Inflation Calculator
Explore how an assumed inflation rate changes value over time.
Open Inflation Calculator →Salary Calculator
Compare hourly pay and annual gross earnings.
Open Salary Calculator →Sales Tax Calculator
Add tax to a price or recover the pre-tax amount.
Open Sales Tax Calculator →Pace Calculator
Convert distance and elapsed time into pace and speed.
Open Pace Calculator →Fraction Calculator
Add, subtract, multiply or divide exact integer fractions.
Open Fraction Calculator →Percentage Calculator
Find a chosen percentage of any total.
Open Percentage Calculator →Random Number Generator
Draw random integers inside an inclusive range.
Open Random Number Generator →Triangle Calculator
Find area and perimeter when all three sides are known.
Open Triangle Calculator →Standard Deviation Calculator
Summarize a dataset with mean, median, spread and standard deviation.
Open Standard Deviation Calculator →Age Calculator
Calculate completed calendar years, months and days.
Open Age Calculator →Date Calculator
Count calendar days between two dates.
Open Date Calculator →Time Calculator
Add or subtract days, hours, minutes and seconds; shift an exact date-time.
Open Time Calculator →Hours Calculator
Calculate elapsed time between clock times.
Open Hours Calculator →GPA Calculator
Average grade points by course credit hours.
Open GPA Calculator →Grade Calculator
Calculate a course grade from scores and assignment weights.
Open Grade Calculator →Subnet Calculator
Inspect a network’s mask, boundaries and conventional host range.
Open Subnet Calculator →Password Generator
Create a password with secure randomness on your device.
Open Password Generator →BMI Calculator
Calculate the weight-to-height index from kilograms and centimeters.
Open BMI Calculator →Financial planning calculators
Auto Loan Calculator
Estimate financing after cash down, trade-in equity, tax and fees.
Open Auto Loan Calculator →Payment Calculator
Solve a monthly payment or estimate payoff time for a payment you choose.
Open Payment Calculator →Interest Rate Calculator
Infer the fixed rate consistent with principal, monthly payment and term.
Open Interest Rate Calculator →Finance Calculator
Explore present value, future value or a regular deposit needed for a goal.
Open Finance Calculator →Investment Calculator
Compare contributions, assumed returns, fees and inflation in a savings scenario.
Open Investment Calculator →Retirement Calculator
Compare projected retirement savings with a modeled spending gap.
Open Retirement Calculator →No matching guide. Try a broader term or search the full toolbox.