Your Trusted Calculation Partner

Mortgage Calculator

Monthly payment from loan amount, APR, and term.

Amortization Calculator

Full schedule: principal, interest, and balance each month.

Mortgage Payoff Calculator

Extra payments: time saved and interest saved.

House Affordability Calculator

Max home price from income, debts, taxes, and insurance.

Rent Calculator

Affordable rent from gross income and rent-to-income percentage.

Debt-to-Income Ratio Calculator

Back-end and housing DTI from income and monthly debts.

Auto Cash Back

Compare a dealer rebate versus a lower APR on your loan.

Auto Loan Calculator

Car payment and total interest from price, down payment, and rate.

Auto Lease Calculator

Monthly lease from cap cost, residual, money factor, and term.

Compound Interest Calculator

Lump-sum growth, compounding frequency, and APY.

CD Calculator

Certificate of deposit maturity and interest by rate and term.

Bond Calculator

Bond price from YTM or approximate YTM from market price.

Interest Rate Calculator

Solve for return on savings or APR from loan payment.

Investment Calculator

Growth with periodic contributions and compounding.

Mutual Fund Calculator

Project NAV, contributions, dividends, fees, and ending fund value.

Average Return Calculator

Arithmetic, geometric, and CAGR metrics from a series of returns.

IRR Calculator

Estimate internal rate of return and NPV for cash flows.

Finance Calculator

Compound frequency, monthly deposits, ending balance and growth.

BMI Calculator

Body mass index from height and weight (metric or US).

Calorie Calculator

Estimated daily calories by sex, age, size, and activity.

Body Fat Calculator

Estimate body fat percentage using US Navy circumference formulas.

BMR Calculator

Basal metabolic rate and daily calories by activity level.

Pregnancy Calculator

Due date from last menstrual period (280-day rule).

Pregnancy Conception Calculator

Estimate ovulation, fertile days, conception timing, and due date.

Ideal Weight Calculator

Ideal weight range, BMI, and clinical formula estimates for your height and frame size.

Pace Calculator

Convert distance and time into pace, speed, and finish time for running.

Pregnancy Weight Gain

Recommended gain ranges by pre-pregnancy BMI.

Scientific Calculator

Trig, logarithms, powers, roots, and standard arithmetic.

Fraction Calculator

Add, subtract, multiply, and divide; results reduced.

Percentage Calculator

Percent of value, percent change, and reverse percentage.

Percent Error Calculator

Compare measured and accepted values with percent error and percent difference.

Sample Size Calculator

Minimum sample size for proportions or means with confidence and margin of error.

Probability Calculator

Union, intersection, complement, and exclusive probabilities for two events.

Random Number Generator

Generate random integers in a range with optional uniqueness.

Standard Deviation Calculator

Sample or population spread from a list of values.

Number Sequence Calculator

Arithmetic or geometric nth term and partial sum.

Age Calculator

Exact age in years, months, and days between two dates.

Date Calculator

Add or subtract days, weeks, or months from a date.

Concrete Calculator

Cubic yards for a rectangular slab or footing.

BTU Calculator

Rough cooling BTU from room size, insulation, and sun.

Square Footage Calculator

Area for rectangles, circles, and triangles with total square footage.

Stair Calculator

Step count, rise, run, stringer length, and stair angle estimates.

Time Calculator

Add or subtract time values with hours, minutes, and seconds.

Hours Calculator

Calculate total hours worked, overtime, and pay from start/end times.

Time Card Calculator

Calculate weekly hours from time card punches, including breaks and overtime.