Fast, accurate calculators for everyday decisions.
125 calculators across 11 categories
Project 401(k) contributions, match, limits, and retirement balance
Create loan amortization schedules
Estimate car payments, taxes, and total auto loan cost
Plan income, expenses, savings, and monthly budget categories
Calculate compound interest and savings growth
Compare credit card payoff strategies and total interest
Convert money with exchange rate and fee estimates
Calculate discounts and sale prices
Track monthly spending, budget fit, and top expense categories
Summarize net worth, cash flow, debt, and emergency coverage
Estimate an affordable home price from income, debt, and cash
Compare CPI-adjusted purchasing power across years
Project portfolio growth with dividends, inflation, fees, and after-tax estimates
Calculate loan payments and amortization
Estimate mortgage payments and amortization schedules
Compare two mortgage offers side by side
Estimate early mortgage payoff timing and interest savings
Estimate take-home pay and paycheck withholding
Track allocation drift and portfolio rebalance gaps
Compare refinance payment savings and break-even timing
Compare renting and buying by long-term net worth
Plan nest egg progress and retirement income targets
Plan retirement savings with long-term projections
Calculate salary raises and comparisons
Plan monthly savings and target timelines
Track savings progress and deadline readiness
Calculate tips and split bills easily
Calculate Australian income tax with 2025-26 brackets
Calculate Brazilian federal income tax (IRPF)
Calculate Canadian federal income tax with 2026 brackets
Calculate German income tax with 2026 brackets
Add tax, remove tax from a total, or derive the implied sales tax rate.
Calculate UK income tax with dynamic year selection
Calculate US federal income tax with 2026 brackets
Estimate gas, EV, or transit commuting cost by day, week, month, and year
Estimate EV charging cost, kWh used, range added, and charge time
Estimate EV range, reserve margin, arrival charge, and charge needed
Estimate gas cost by distance, fuel economy, pump price, and travelers
Calculate MPG, L/100 km, km/L, and optional cost per distance
Compare time saved by speeding with impact and drag demand estimates
Estimate driving time, arrival time, stops, and trip duration
Convert pressure units and estimate sea-level pressure
Estimate dew point from temperature and relative humidity
Estimate feels-like heat from temperature and relative humidity
Estimate relative humidity, dew point, and absolute humidity
Find sunrise, sunset, daylight length, and twilight times
Estimate wet-bulb temperature from humidity and pressure
Estimate feels-like cold from temperature and wind speed
Estimate concrete volume, waste allowance, and bag counts
Estimate flooring boxes, waste, surplus material, and project cost
Estimate gravel volume, weight, bag count, waste, and cost
Estimate mulch bags, bulk volume, waste, and material cost
Estimate paint gallons or liters with coats, openings, and waste
Estimate roof area, shingles, underlayment, and material cost
Calculate square feet, waste allowance, and material cost
Calculate class attendance and missed-class allowance
Find the final exam score needed for a target course grade
Calculate weighted GPA from credits and letter grades
Average percentage scores with optional drop-lowest support
Curve a test score with points, percentages, or class-high scaling
Convert percentages into letter grades and GPA points
Calculate semester GPA and updated cumulative GPA
Calculate the GPA needed to reach a target cumulative GPA
Convert points earned into a percentage and letter grade
Calculate a course grade from category weights and grades
Calculate adult BMI and healthy weight range
Calculate exact age from date of birth
Estimate resting calories and maintenance context
Estimate adult body fat percentage from tape measurements
Calculate a daily calorie target for weight loss
Calculate daily and maintenance calories from BMR and activity
Calculate e-liquid nicotine base, VG, PG, and flavor volumes
Estimate calories burned during workouts and activities
See fasting stages, timeline position, and the next milestone
Compare ideal body weight formulas and healthy BMI range
Estimate implantation and pregnancy test timing
Calculate keto net carb, protein, and fat targets
Calculate daily protein, carb, and fat targets
Calculate daily macros, fiber, and per-meal targets
Estimate ovulation and fertile window dates from cycle timing
Estimate next period dates and upcoming cycle windows
Calculate baby's due date and track pregnancy milestones
Calculate maintenance calories from BMR and activity
Count weekdays or add and subtract business days with holiday exclusions
Count live time until a date or elapsed time since an event
Calculate days between dates or add and subtract calendar time
Find weekdays, nth weekdays in a month, and date distance
Calculate weekly work hours, breaks, overtime, and estimated pay
Find overlapping meeting times across time zones
Find US federal holidays, observed dates, and the next holiday
Convert dates to ISO week numbers and ISO weeks to dates
Simple calculator with full keyboard support
Symbolic differentiation, slope evaluation, and tangent lines
Add, subtract, multiply, divide, and simplify fractions
Symbolic antiderivatives, definite integrals, and area estimates
All-in-one percentage calculator with 5 calculation modes
Right-triangle sides, hypotenuse, angles, area, and perimeter
Random integers, decimals, unique draws, and seeded results
Trigonometry, logarithms, powers, roots, and constants
Convert centimeters to inches instantly
Convert feet to meters instantly
Convert gallons to liters instantly
Convert grams to ounces instantly
Convert inches to centimeters instantly
Convert inches to feet instantly
Convert inches to millimeters instantly
Convert kilograms to pounds instantly
Convert kilometers to miles instantly
Convert pounds to kilograms instantly
Convert liters to US gallons instantly
Convert meters to feet instantly
Convert miles to kilometers instantly
Convert millimeters to inches instantly
Convert ounces to grams instantly
Convert between temperature scales instantly
Calculate time differences and add or subtract time
Convert time between time zones worldwide
Universal unit converter with 60+ units
Simplify ratios and resize images or video without stretching
Estimate display bandwidth for custom video modes
Calculate download times and file transfer speeds
Calculate IPv4 subnet masks, host ranges, and CIDR blocks
Calculate screen pixel density, pitch, and viewing distance
Estimate usable RAID storage after spares and reserves
Estimate video storage from practical export presets
