EveryCalculatorYou'll Ever Need — Free & Instant

Monthly payment, total interest, and amortization summary

Personal and auto loan payment calculator

See your money grow with compound interest projections

Months to pay off your card and total interest paid

Total assets minus total liabilities

Project your savings to retirement age

Tip amount and split evenly among people

Old vs new salary, percentage increase, monthly impact

Take-home pay after federal, state, FICA taxes, and pre-tax deductions

Wall area, gallons needed with waste, and cost estimate for any room

Square footage, waste factor, boxes needed, and total material cost

Cubic yards and bags needed for slabs, columns, and tube forms

Roof area, squares, bundles of shingles, and cost estimate by pitch

Posts, panels, and cost estimate for wood, vinyl, chain link, or aluminum

Deck boards, linear footage, and material cost for any deck size

Sheets of drywall needed for walls and ceiling with 10% waste built in

Board feet and stud count for wall framing projects

Tiles needed by size, waste percentage, and total cost

Rolls or bags of insulation needed by R-value and area

Cubic yards and tons of gravel, sand, topsoil, or mulch for any area

Number of steps, riser height, stringer length, and material counts

Minimum wire size per NEC 310.15 ampacity with derating and voltage drop check

Voltage drop, drop %, and voltage at load end — single and 3-phase

Minimum and next standard breaker size with NEC 210.20 continuous load rule

Solve for voltage, current, resistance, or power — enter any two values

NEC Chapter 9 conduit fill percentage for mixed wire gauges and conduit types

NEC 314.16 conductor count and cubic inch box fill calculation

NEC 430 motor FLA, minimum wire size, branch circuit protection, and overload sizing

Real power (kW), reactive power (kVAR), apparent power (kVA), and capacitor correction

Primary and secondary current from kVA rating, voltages, and phase

NEC 220.82 optional method service sizing for single-family dwellings

Running watts, motor starting surge, and recommended generator kW with transfer switch guidance

Fixtures needed, total watts, amps, and ASHRAE 90.1 LPD pass/fail for any room type

Full NEC 220 residential load calculation with demand factors for permit applications

NEC 220 Part III commercial load calculation with demand factors by occupancy type

System size, panel count, cost, payback period, and 25-year savings projection

Charge time, circuit size, wire gauge, and breaker for 30+ electric vehicles

Battery bank sizing, inverter size, and solar recharge for off-grid and backup systems

NEC 250 grounding electrode conductor sizing with electrode type requirements

NEC 220.61 neutral demand factor calculation — when you can reduce the neutral

Variable Frequency Drive circuit breaker, wire sizing, and output filter recommendations

Simplified IEEE 1584 incident energy estimator with PPE category and arc flash boundary

Stack ALL NEC derating factors — temperature, conduit fill, continuous load — into one combined result

Convert between Fahrenheit, Celsius, and Kelvin instantly

Inches, feet, miles, meters, kilometers, and more

Pounds, kilograms, ounces, stone, metric tons, and more

Cups, gallons, liters, fluid ounces, and more

MPH, KPH, meters per second, knots, Mach, and more

Square feet, acres, hectares, square meters, and more

MPG, L/100km, km/L — plus trip fuel cost calculator

Bits, bytes, KB, MB, GB, TB, and petabytes

PSI, bar, atmospheres, Pascal, kPa, mmHg, and inHg

Joules, calories, BTU, kWh, and more

Two-way miles and kilometers conversion with meters, feet, and yards

Two-way live conversion between Celsius, Fahrenheit, and Kelvin

Two-way feet and meters conversion with inches, centimeters, and yards

Two-way pounds and kilograms conversion with ounces, grams, and stone

Two-way inches and centimeters conversion with millimeters and feet

Body Mass Index with category label

Basal Metabolic Rate using Mifflin-St Jeor formula

Total Daily Energy Expenditure based on activity level

Estimated BAC based on drinks, weight, and time

Calories burned by activity and duration

Pace per mile and km, speed, and projected finish times for common race distances

Estimate your max lift from reps and weight — plus a full percentage training table

Estimate aerobic fitness from the Cooper 12-minute run test

Daily protein target by weight, activity level, and goal — lose fat, maintain, or build muscle

Estimate body fat percentage using the US Navy tape measurement method

Max heart rate and 5 training zones by age — basic or Karvonen method

Pace per 100m and 100yd plus projected finish times for standard swim distances

Jump height to peak power output using the Sayers formula, plus performance rating

Calories burned running by weight, distance, and intensity level

Predict your finish time at any race distance using the Riegel endurance formula

Target weight range by height and gender using four clinical formulas

Functional Threshold Power, W/kg ratio, and all 7 Coggan training zones

Player and team stats — per-game averages, shooting splits, PER, TS%, and advanced analytics

Convert between 30 major world currencies with approximate exchange rates

Your true minimum hourly rate as a freelancer — accounting for taxes, benefits, overhead, and vacation

Build a quick invoice with line items, discount, and tax — see your total at a glance

Estimate project profit, margin, and your effective hourly rate after all costs

Fixed costs, variable costs, and price — how many units or clients until you profit?

Monthly payment, total interest, and true cost of a business loan

Convert between markup percentage and gross margin — they are not the same

True total cost of an employee vs. a contractor, including taxes, benefits, and overhead

SE tax owed, the deductible portion, and your quarterly estimated payment schedule

Track monthly burn rate, net cash flow, and runway until funds run out

Your exact age in years, months, days, hours, minutes, and seconds — live

Total days, weeks, and hours you have been alive

Live countdown timer to your next birthday

What day of the week was any date?

How old would you be on Mercury, Venus, Mars, and beyond?

How long to finish a show, and what date you will finish

Simple estimator based on age, gender, lifestyle, and country

Add or subtract multiple time durations and see the total in hours, minutes, and seconds

Caffeine half-life tracker — when will it leave your system?

Your age in dog years and cat years

Estimated reading time from word count or pasted text

Annual salary broken down to hourly, daily, and weekly

Live countdown to any future date

View current time across 20 major cities worldwide

Precise stopwatch with lap tracking and split times

Set a countdown with quick presets and progress bar

Focus timer with customizable work and break intervals

Convert any time between 20+ world time zones

Customizable work/rest interval timer for HIIT, Tabata, and circuit training

Set up to 5 alarms with labels, browser notifications, and sound alerts