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Everyday Calculators

Free Everyday Calculators

30+ free calculators for daily life — tip splitting, GPA, grades, gas mileage, discounts, sleep, paycheck, home improvement, and more. No sign-up, no ads. Works instantly on any device.

30+ Free Calculators Works on Mobile & Desktop Instant Results No Sign-Up Required
Quick Tip Calculator
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Total Bill
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The tools millions of Americans reach for every single day

🔥 Most Popular~5.4M searches/mo

Tip Calculator

Calculate the perfect tip amount and split the bill evenly among any number of people. Supports custom tip percentages, multiple people, and shows tip per person, total per person, and tip amount. The single most searched everyday calculator in the United States.

Restaurant tip Bill splitting Custom % tip Tip per person Delivery tip
how much to tip at a restaurant tip calculator split bill is 20% a good tip tip on $50 bill
Open Tip Calculator →
Popular

Sales Tax Calculator

Calculate sales tax for any US state. Find the total price with tax added, or the pre-tax price from a total. Updated with 2025 state tax rates.

By state rate Price + tax Reverse tax

🎓 School & Education

High Volume~4.8M/mo

GPA Calculator

Calculate your semester GPA, cumulative GPA, or find out what grade you need to raise your GPA. Supports weighted credit hours, plus/minus grading, and all standard 4.0 and 5.0 GPA scales used by US high schools and colleges.

Semester GPA Cumulative GPA GPA target needed 4.0 & 5.0 scale Weighted credits
what GPA do I need to get a 3.0 how to calculate GPA college cum GPA calculator weighted GPA calculator
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⛽ Gas & Driving

~2.1M/mo

Gas Mileage Calculator (MPG)

Calculate your vehicle's fuel efficiency in miles per gallon (MPG), liters per 100km (L/100km), or km/L. Track gas costs per mile and compare fuel efficiency between vehicles. Uses real miles driven and gallons filled.

MPG calculation L/100km Cost per mile Fill-up tracker Compare vehicles
how to calculate MPG gas mileage tracker fuel economy calculator
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Popular

Gas Cost Calculator

Estimate the gas cost for any trip based on distance, your MPG, and the current gas price per gallon. Great for road trips and commute planning.

Road trip cost Daily commute By gas price

💼 Work & Paycheck

Work~2.3M/mo

Time Card Calculator

Calculate total hours worked from time-in and time-out entries. Supports lunch/break deductions, daily and weekly totals, overtime hours (over 40/week per FLSA), and pay calculation at your hourly rate. Handles AM/PM and 24-hour military time.

Weekly hours Lunch deductions Overtime (FLSA) Pay calculation Military time
time card calculator with lunch break hours worked calculator bi-weekly time card calculator
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Work

Overtime Calculator

Calculate overtime pay at time-and-a-half (1.5×) per FLSA rules. Supports double time and state-specific rules. Find gross weekly pay with OT.

Time-and-a-half Double time Weekly gross pay
Popular

Pay Raise Calculator

Calculate your new salary after a raise. Enter current salary and raise percentage, or enter both old and new salary to find the percentage increase.

New salary % increase Monthly & annual

🏠 Home & Lifestyle

~1.7M/mo

Sleep Calculator – Best Bedtime & Wake-Up Time

Find the best time to go to sleep or wake up based on 90-minute sleep cycles. Waking up between cycles helps you feel more refreshed. Enter your target wake time to see the optimal bedtimes, or enter your bedtime to find the ideal wake-up windows.

Bedtime by wake time Wake time by bedtime 90-min cycles 6 sleep windows Sleep debt tracker
what time should I go to sleep best time to wake up 7am sleep cycle calculator
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Home

Concrete Calculator

Calculate cubic yards of concrete needed for a slab, column, tube, or step. Supports all standard shapes. Includes bags-of-concrete estimate for small jobs.

Slabs & pads Bags of concrete Cubic yards
Home

Paint Calculator

Calculate how many gallons of paint you need for any room based on wall dimensions, number of coats, and paint coverage. Includes ceiling and trim options.

Gallons needed Room coverage Multi-coat
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US Tipping Guide 2025

Standard tipping etiquette across the most common service situations in America

Open Tip Calculator →
Service Type Minimum Standard (Good Service) Excellent Service Example: $60 Bill
Restaurant (sit-down)15%18–20%22–25%$10.80 – $15.00
Bar / cocktails$1–2 per drink15–18%20%+$9 – $12
Food delivery10–15%15–20%20%+$9 – $12
Taxi / rideshare (Uber/Lyft)10%15–18%20%$9 – $12
Hair salon / barber15%18–20%25%$10.80 – $15
Hotel housekeeping$2–3/night$3–5/night$5+/nightPer night
Spa / massage15%18–20%20–25%$10.80 – $15
Coffee shop / counterNo tip required$0.50–$110–15%Optional
Food truckNo requirement10–15%15–20%$6 – $12

→ Use our tip calculator to calculate any amount instantly and split it between your group.

GPA Scale Reference Chart

Standard US 4.0 GPA scale used by colleges and universities

Open GPA Calculator →
Letter GradeGPA Points (4.0)Percentage RangeDescriptionTypical Requirement
A+4.097–100%ExceptionalDean's List (most schools)
A4.093–96%ExcellentDean's List (most schools)
A−3.790–92%ExcellentDean's List (some schools)
B+3.387–89%GoodGood academic standing
B3.083–86%GoodGood academic standing
B−2.780–82%Above averageGood academic standing
C+2.377–79%AverageSatisfactory progress
C2.073–76%AverageMinimum for graduation (many schools)
C−1.770–72%Below averageMay not count for major requirements
D1.060–69%Poor / PassingAcademic probation risk
F0.0Below 60%FailingMust retake; affects standing

→ Calculate your GPA with weighted credit hours automatically.

All Everyday Calculators

Browse the complete list of free everyday tools

🍽️
Tip Calculator
Restaurant tip, bill split, tip per person
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🎓
GPA Calculator
Semester GPA, cumulative GPA, 4.0 & 5.0 scale
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📝
Grade Calculator
Current grade, final exam needed, weighted
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⛽
Gas Mileage Calculator (MPG)
Fuel efficiency, cost per mile, MPG tracking
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Gas Cost Calculator
Trip gas cost, commute cost, road trip planner
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🏷️
Discount Calculator
Sale price, savings, original price from sale
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🧾
Sales Tax Calculator
Price + tax, reverse tax, 2025 state rates
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😴
Sleep Calculator
Best bedtime, best wake time, 90-min cycles
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⏱️
Time Card Calculator
Hours worked, lunch break, weekly pay, OT
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🕐
Overtime Calculator
1.5× overtime pay, double time, weekly gross
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💸
Pay Raise Calculator
New salary after raise, % increase, monthly
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🏗️
Concrete Calculator
Cubic yards, bags needed, slab & column
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🎨
Paint Calculator
Gallons of paint for a room, multi-coat
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💡
Electricity Cost Calculator
Monthly appliance cost, wattage, kWh rate
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🎲
Random Number Generator
Random numbers in any range, multiple results
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🕔
Military Time Converter
12-hour to 24-hour time, military time chart
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🎂
Age Calculator
Exact age in years, months, days from birthdate
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🔢
Hours Calculator
Add or subtract time, total hours between times
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📏
Bra Size Calculator
US bra size from band & cup measurements
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🏠
Flooring Calculator
Square feet needed for tile, hardwood, carpet
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Find the Right Calculator for Your Situation

Whether you're splitting the check at a restaurant, tracking your GPA, planning a road trip, or figuring out your next raise — our everyday calculators handle the math so you don't have to.

Dining & Shopping

How much should I tip at a restaurant? How much to tip a DoorDash driver? What is 30% off $80? Sales tax calculator by state Split bill calculator for groups Original price before discount calculator

School & Work

How to calculate cumulative GPA What grade do I need on my final exam? Weighted GPA calculator high school How many hours did I work this week? How to calculate overtime pay 3% raise on $60,000 salary

Home, Car & Life

How to calculate my car's MPG Gas cost for road trip calculator What time to sleep to wake up at 6am? How many bags of concrete for a patio? How much does it cost to run an AC? How many gallons of paint for a bedroom?

Everyday Calculator FAQs

Quick answers to the most common everyday math questions

How much should you tip at a restaurant?
Standard US restaurant tipping: 15% for adequate service, 18–20% for good service, 22–25% for exceptional. On a $60 bill: 18% = $10.80, 20% = $12, 25% = $15. For delivery, 15–20% or $5 minimum. For counter service, a tip is optional. Use our tip calculator to split any bill instantly.
How do I calculate my GPA?
GPA = Σ(Grade Points × Credit Hours) ÷ Total Credit Hours. Example: A in 3-credit class (4.0×3=12) + B in 4-credit class (3.0×4=12) = 24 ÷ 7 = 3.43 GPA. Our GPA calculator handles weighted credits, plus/minus grades, and cumulative GPA automatically.
How do I calculate gas mileage (MPG)?
MPG = Miles Driven ÷ Gallons Used. Fill your tank, drive, fill up again. Note the miles driven and gallons pumped. Example: drove 315 miles, used 10.5 gallons = 30 MPG. The average 2024 car gets 28–32 MPG. Our gas mileage calculator does this instantly.
What time should I go to sleep to wake up at 7 AM?
Sleep cycles last ~90 minutes. To wake at 7:00 AM refreshed, go to sleep at: 10:00 PM (6 cycles, 9 hrs), 11:30 PM (5 cycles, 7.5 hrs), or 1:00 AM (4 cycles, 6 hrs). Add ~15 min to fall asleep. Our sleep calculator generates 6 optimal windows for any wake time.
How do I calculate overtime pay?
Under FLSA, overtime = regular rate × 1.5 for hours over 40/week. Example: $20/hr regular rate, 45 hours worked = 40 regular hours ($800) + 5 OT hours ($150) = $950 gross. Some states (CA, CO, AK) require daily overtime too. Use our overtime calculator.
How do I calculate a discount (sale price)?
Sale Price = Original Price × (1 − Discount%). Example: $120 item at 25% off = $120 × 0.75 = $90. You save $30. To find the discount%: (Original − Sale) ÷ Original × 100. Our discount calculator works in both directions and includes savings amount.
How do I calculate how many gallons of paint I need?
One gallon of paint covers ~350–400 sq ft (one coat). To find square footage, multiply wall width × height for each wall and add. Subtract doors (20 sq ft) and windows (15 sq ft). Divide by 350, multiply by coats. A standard 12×12 bedroom needs ~2 gallons for 2 coats. Our paint calculator handles rooms of any size.
How much does it cost to run an appliance per month?
Cost = (Watts × Hours/Day × Days) ÷ 1,000 × Cost per kWh. The average US rate is ~$0.16/kWh. A 1,500W space heater running 8 hrs/day × 30 days = (1500 × 8 × 30 ÷ 1000) × $0.16 = $57.60/month. A 100W TV same hours = $3.84/month. Use our electricity cost calculator.

About Our Everyday Calculators

"Everyday calculators" are the tools people reach for dozens of times per week without thinking about it — the tip calculator at a restaurant, the GPA calculator at semester end, the gas mileage calculator after a fill-up. These are utility tools that should work instantly, without friction, on any device.

Our tip calculator uses simple arithmetic — bill × (tip% ÷ 100) — divided by the number of people. Our time card calculator follows the Fair Labor Standards Act (FLSA) definition of overtime: any hours over 40 in a standard workweek are compensated at 1.5× the regular rate for most US employees.

The sleep calculator is based on sleep cycle research showing that humans cycle through NREM and REM sleep in approximately 90-minute intervals. Waking at the end of a cycle (rather than in the middle of deep sleep) correlates with feeling more alert. The 14-minute sleep onset average is from the National Sleep Foundation.

The gas mileage calculator uses the EPA standard method: miles driven ÷ gallons of fuel used. The electricity cost calculator uses the formula (Watts × Hours × Days ÷ 1000) × kWh rate, based on how utilities meter consumption.