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INSTANT ANSWERS

704 instant answers across 35 topics — each with a full calculator. Or ask your own →

Percentages (153) →
5% of 2010% of 2015% of 2020% of 20See all 153 →
Percentage discounts (35) →
10% off 2015% off 2020% off 2025% off 20See all 35 →
Conversions (126) →
1 miles to km2 miles to km3 miles to km5 miles to kmSee all 126 →
Time durations (12) →
90 minutes in hours45 minutes in hours120 minutes in hours2.5 hours in minutesSee all 12 →
Number bases (34) →
8 in binary8 to hex10 in binary10 to hexSee all 34 →
Roman numerals (66) →
1 in roman2 in roman3 in roman4 in romanSee all 66 →
Colors (30) →
#ff0000 to rgb#00ff00 to rgb#0000ff to rgb#ffffff to rgbSee all 30 →
Aspect ratios (10) →
1920x1080 aspect ratio1280x720 aspect ratio2560x1440 aspect ratio3840x2160 aspect ratioSee all 10 →
Fuel economy (8) →
20 mpg to l/100km25 mpg to l/100km30 mpg to l/100km40 mpg to l/100kmSee all 8 →
Fractions to decimals (20) →
1/2 as decimal1/3 as decimal2/3 as decimal1/4 as decimalSee all 20 →
Decimals to fractions (13) →
0.1 as a fraction0.2 as a fraction0.25 as a fraction0.3 as a fractionSee all 13 →
Numbers to words (37) →
1 in words2 in words3 in words4 in wordsSee all 37 →
Download time (8) →
download 1gb at 100mbpsdownload 5gb at 50mbpsdownload 10gb at 100mbpsdownload 2gb at 20mbpsSee all 8 →
Timestamps (6) →
1700000000 to date1609459200 to date1577836800 to date1500000000 to dateSee all 6 →
Scientific notation (7) →
45000 in scientific notation0.00045 in scientific notation123456 in scientific notation0.0012 in scientific notationSee all 7 →
Averages, sums & median (9) →
average of 4, 8, 15, 16average of 10, 20, 30average of 5, 10, 15, 20, 25mean of 2, 4, 6, 8See all 9 →
Speed & distance (6) →
60 mph for 2 hours70 mph for 3 hours30 mph for 1 hour100 km/h for 2 hoursSee all 6 →
Time of day (6) →
3 hours after 9:45am2 hours before 1:30pm90 minutes after 10:00am45 minutes after 8:15amSee all 6 →
GCD & LCM (7) →
gcd of 12 and 18gcd of 24 and 36gcd of 8 and 12lcm of 4 and 6See all 7 →
Factorials (6) →
factorial of 5factorial of 6factorial of 7factorial of 8See all 6 →
Prime numbers (7) →
is 17 primeis 2 primeis 51 primeis 97 primeSee all 7 →
Leap years (6) →
is 2024 a leap yearis 2025 a leap yearis 2000 a leap yearis 1900 a leap yearSee all 6 →
Day of week (5) →
what day is 2026-01-01what day is 2026-12-25what day was 2000-01-01what day is 2026-07-04See all 5 →
Ratios (6) →
simplify 18:24simplify 50:100reduce 12:8simplify 4:6See all 6 →
Powers & roots (8) →
12 squared15 squared25 squared5 cubedSee all 8 →
Percent, decimal & fraction (12) →
15% as a decimal20% as a decimal5% as a decimal50% as a decimalSee all 12 →
Interest (6) →
compound 1000 at 5% for 10 yearscompound 10000 at 7% for 20 yearscompound 5000 at 6% for 15 yearscompound 1000 at 8% for 30 yearsSee all 6 →
Days in a month (8) →
how many days in february 2024how many days in february 2025days in januarydays in aprilSee all 8 →
Combinations (7) →
5 choose 210 choose 36 choose 252 choose 5See all 7 →
Ordinal numbers (7) →
1 as ordinal2 as ordinal3 as ordinal11 as ordinalSee all 7 →
Zodiac signs (6) →
zodiac sign for january 15zodiac sign for march 21zodiac sign for june 7zodiac sign for july 23See all 6 →
Fibonacci (5) →
10th fibonacci number15th fibonacci number20th fibonacci number25th fibonacci numberSee all 5 →
Divisibility (5) →
is 100 divisible by 7is 100 divisible by 3is 1000 divisible by 8is 21 divisible by 3See all 5 →
Sales tax (5) →
sales tax on 50 at 8%sales tax on 100 at 7%sales tax on 25 at 9.5%remove 8% tax from 108See all 5 →
Math (12) →
12 * 1215 * 1525 * 412 * 8See all 12 →