Other Calculators

Exact age in years, months, days, plus next birthday and totals.

Days between dates, add/subtract a duration, or count business days.

Add or subtract durations, time between two clocks, and convert any time unit.

Hours worked between two times, with breaks, cross-midnight shifts, and weekly overtime.

Compute weighted or unweighted GPA on a 4.0 or 5.0 scale.

Weighted average across assignments and exams, plus exactly what you need on the final.

Instant unit converter: length, weight, temperature, and volume. Type any unit, see them all update.

Calculate voltage loss in any electrical circuit by wire gauge, material, distance, and load, with NEC compliance check.

Predict your child's adult height from parents' heights using the Mid-Parental Height formula , supporting metric and imperial units.

Bra size from band and bust measurements, US and UK sizing.

Virtual dice roller for tabletop RPGs. Roll d4, d6, d8, d10, d12, d20, and d100 with flat modifiers and up to four simultaneous die groups. Individual results, total, stats, and roll history with smooth dice animations.

Total trip cost, fuel needed, and cost per mile or kilometre: metric or imperial.

Calculate the BTU/hr required to heat or cool any room. Enter dimensions, insulation, sun exposure, and climate zone, both cooling and heating are calculated together.

Area in square feet for any rectangular or irregular space.

Calculate total worked hours and gross pay from daily clock-in/clock-out times and breaks, with weekly and daily overtime support.

Convert any time across 60+ world time zones with full DST awareness, with day crossovers highlighted, UTC offset shown for every city.

Calculate GDP using the expenditure approach (C + I + G + NX) with component breakdown, trade balance, and per capita output.

MPG or l/100 km from miles driven and gallons used.

Horsepower from torque and RPM, plus drivetrain loss.

Calculate brake horsepower from engine displacement, RPM, and BMEP for 4-stroke and 2-stroke engines.

Stair stringer length, riser height, tread depth, step count, and stair angle from total rise and run.

Resistor color-band decoder for 4-, 5-, and 6-band resistors.

Calculate electricity cost and kWh consumption from wattage, hours of use, and your utility rate.

Trip fuel costs and IRS business mileage reimbursements in one tool.

Calculate mass from density and volume, or from force and acceleration using Newton's second law.

Weight on Earth, the Moon, Mars: gravitational weight conversion.

Solve for molarity, mass, volume, or moles using M = n/V. Supports grams, mg, kg, mL, μL, mM, μM, and more.

Molar mass from any chemical formula: H₂O, C₆H₁₂O₆, Ca(OH)₂, and more.

Convert between Arabic numerals and Roman numerals (I, V, X, L, C, D, M).

Calculate your WHS Handicap Index from up to 20 rounds using course rating and slope.

Best bedtime and wake time based on 90-minute sleep cycles.

Compare two tire sizes: sidewall height, overall diameter, circumference, and speedometer error.

Calculate cubic yards of mulch or topsoil for rectangle, circle, or triangle garden beds.

Volume and weight of gravel needed for driveways, paths, and landscaping projects.

Calculate the feels-like temperature from air temperature and wind speed using the official NWS wind chill formula.

Feels-like temperature from air temperature and relative humidity using the NWS Rothfusz formula.

Calculate dew point from air temperature and relative humidity using the Magnus-Tetens formula, with comfort scale and condensation guidance.

Calculate download and upload times for any file size and internet connection speed, with Mbps, MB/s, Gbps, and KB/s support.

Percent-encode and decode URLs, safe for query strings and paths.

Elapsed time between two clocks, or add/subtract hours from any start time.

Count the exact days, weeks, months, and years between any two dates, with weekday breakdown and leap year support.

Find the exact day of the week for any historical or future date, from year 1 to 9999.

Real-time word, character, sentence, and paragraph counter with reading and speaking time.

Convert your dog's age to human years using the modern, science-based AKC formula — not the outdated ×7 rule. Accounts for breed size, shows life stage, vet tips, and a full reference table.

Convert Digital SAT raw scores into scaled scores (200–800) and estimate your composite (400–1600) and percentile rank. Includes ACT-to-SAT conversion table.