Free Online Calculators
Free Calculators
& Tech Tools
Calculate tips, AP exam scores, ERA, DOTS, and more with our free online calculators. No signup required — plus tech articles to help you learn and build.
Popular Calculators
Free online tools — no signup, no ads, instant results.
💰 Tip Calculators
DoorDash Tip Calculator
Calculate the perfect tip for your DoorDash delivery drivers. Free, instant, and tailored for food delivery services including DoorDash, Uber Eats, and Grubhub.
Try itTip Calculator for Tattoo
How much to tip your tattoo artist? Calculate appropriate gratuity based on tattoo cost, session length, design complexity, and artist experience. Free tattoo tipping guide.
Try itDog Groomer Tip Calculator
Calculate tips for dog groomers based on service type, dog size, coat condition, and grooming complexity. Free tool for pet owners to show appreciation for quality grooming services.
Try itTip Calculator for Nail Salon
Calculate tips for nail salon services including manicures, pedicures, acrylics, gel nails, and custom nail art. Quick, easy, and free tip calculator for nail services.
Try itHaircut Tip Calculator
Calculate the right tip for your haircut, styling, coloring, or treatment service. Based on service cost, time invested, and stylist experience level. Free salon tipping guide.
Try it📚 AP Score Calculators
AP Bio Score Calculator
Estimate your AP Biology exam score from raw MCQ and FRQ results.
Try itAP Chem Score Calculator
Calculate your AP Chemistry exam score with section breakdowns.
Try itAP World Score Calculator
Estimate AP World History scores from MCQ, SAQ, DBQ, and LEQ.
Try itAP Micro Score Calculator
Calculate your AP Microeconomics exam score from raw MCQ and FRQ results.
Try itMiddle School GPA Calculator
Calculate your middle school GPA with weighted and unweighted options. Supports letter grades and percentages.
Try it🧮 Utility & Finance Calculators
ERA Calculator
Calculate Earned Run Average for baseball and softball pitchers.
Try itCrosswind Calculator
Calculate aviation crosswind and headwind components for pilots.
Try itDOTS Calculator
Calculate powerlifting DOTS scores for fair strength comparison.
Try itCPM Calculator
Calculate cost per mille (CPM) for advertising campaigns.
Try itStripe Fee Calculator
Calculate Stripe payment processing fees and net amounts for transactions.
Try itDividend Calculator
Calculate dividend yield, income, and returns with DRIP reinvestment options.
Try it🔧 More Free Tools
VLSM Calculator
Calculate Variable Length Subnet Masking. Free online VLSM calculator for network subnetting and IP address allocation.
Try itHalf Birthday Calculator
Find your next half birthday and days until celebration.
Try itRPE Calculator
Calculate Rate of Perceived Exertion for weightlifting and estimate 1RM.
Try itMcDonald's Calorie Calculator
Track calories and nutrition for McDonald's menu items.
Try itABG Calculator
Interpret arterial blood gas results for acid-base analysis.
Try itFOC Calculator
Calculate Front of Center for archery arrows and optimize performance.
Try itWhy Use Our Free Online Calculators?
Our calculators are designed to be fast, accurate, and completely free. Whether you need to calculate a tip for your DoorDash driver, estimate your AP Biology exam score, or figure out a baseball pitcher's ERA, our tools give you instant results without any signup required.
Each calculator is built with accuracy in mind. Our tip calculators account for special circumstances like bad weather or complex services. Our AP score calculators use official College Board scoring methodologies. And our specialty calculators follow industry standards for sports, aviation, medical, and construction fields.
Don't forget to check out our tech blog for helpful guides and tutorials on software, gaming, and internet tools. We regularly publish articles on topics like software reviews, gaming guides, and social media tips.
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