Finance · 2026
Paycheck Calculators
Take-home pay after federal, FICA and state taxes in all 50 states and Washington, DC.
FreeNo account · 11 categories + paycheck calculators
Free Online Calculators for Everyday Decisions
Tuff Search is a free calculator website for everyday decisions — from estimating your take-home pay and planning 401(k) savings to working out calories, asphalt tonnage or the midpoint between two points. Pick a category, enter your numbers and get a clear result with an explanation of how it was calculated.
Formula shownMethod + worked example
Inputs stay in your browserNot sent to our servers
Phone, tablet & desktopFree · no sign-up
11 categories
Plus state-by-state paycheck calculators
Free to use
No account or sign-up needed
Formulas you can check
Method, source and worked example
Works everywhere
Phones, tablets and desktops
Start here
Popular calculators
Jump straight into a calculator. Each one opens on its own page with instructions, the formula used and a worked example.
Finance
401(k) Calculator
Project your 401(k) balance at retirement with employer match, compound growth and 2026 IRS limits.
Health
TDEE Calculator
Estimate your total daily energy expenditure with the Mifflin-St Jeor equation and activity multipliers.
Daily Life
Tip Calculator
Work out the tip, total and each person’s share in seconds.
Female
Period Calculator
Predict your next periods, estimated ovulation and fertile window from the first day of your last period.
Construction
Asphalt Calculator
Estimate asphalt tonnage from length, width, thickness and density (145 lb/ft³ default), plus waste and cost.
Statistics
Normal Distribution Calculator
Find normal distribution probabilities below, above or between values, and convert scores to z-scores.
Biology
Dog Pregnancy Calculator
Find your dog’s due date from the mating date (63 days, normal range 58–68).
Marketing
ROAS Calculator
Calculate return on ad spend, your break-even ROAS and the target ROAS for a profit goal.
Math
Midpoint Calculator
Find the midpoint between two points with steps, using M = ((x₁ + x₂)/2, (y₁ + y₂)/2).
Looking for something else?
See every calculator by category or A–Z on the All Calculators page.
Browse by topic
Calculator categories
Our calculators are organised into 11 categories, plus paycheck calculators for every US state.
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Finance Calculators
401(k) growth, effective annual rate, basis points, appreciation, take-home pay by state, labour cost and burn rate
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Paycheck Calculators
Take-home pay after federal, FICA, state and local taxes for all 50 states and Washington, DC (2026).
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Health Calculators
Daily calories, fat and nutrient needs, keto macros, BMI goal weight, cholesterol ratio and military fitness test scores
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Daily Life Calculators
Engine compression ratio, RPM, wheel offset, crosswind, cleaning costs, curtain and fabric sizes, exact age and tips
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Sports Calculators
Bench press 1RM, dunk height, bike size and pace, rowing erg splits, walking calories, batting average and fish weight
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Construction Calculators
Estimate asphalt tonnage, volume and cost for driveways, car parks and roads, plus labour cost for your crew
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Math Calculators
Rounding, percent error, radicals, midpoint, synthetic division, Cramer’s rule and singular value decomposition
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Statistics Calculators
Normal and binomial distributions, dice probability, permutations, drop chance odds and relative risk
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Biology Calculators
Dog and cat pregnancy due dates, dog heat cycles, cow gestation, cat age in human years and how big a puppy will grow
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Food Calculators
Coffee brew ratios, sourdough hydration, doughnut and ice cream recipes, pizza size value and how much popcorn to make for a party
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Marketing Calculators
Facebook, LinkedIn, TikTok and YouTube ad budgets, ROAS, SEO cost and ROI, plus Shopify fees – with formulas and planning examples
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Female Calculators
Period and ovulation dates, hair growth timelines, ring sizes, childcare costs and the female delusion calculator
Just added
New on Tuff Search
Recently added calculators include:
- Shopify Fee Calculator
- Walking Calorie Calculator
- Sourdough Calculator
- Ring Size Calculator
- Binomial Distribution Calculator
- Navy PRT Calculator
See every tool on the All Calculators page.
Simple by design
How Tuff Search calculators work
Three steps from question to a result you can understand — and check.
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Choose a calculator
Browse by category or use the A–Z list on the All Calculators page.
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Enter your numbers
Each input is labelled with its unit. Most calculators let you switch between metric and imperial units where it matters.
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Read the result and the explanation
Results come with the formula or method used, a worked example and notes on limitations, so you can check the logic yourself.
Results you can checkFormula, worked example and limitations on every page.
Why Tuff Search
Why people use Tuff Search
Clear calculators with nothing hidden — the method, the source and the limits are on the page.
Formulas you can check
Each calculator shows the formula or method it uses and the source it is based on — for example IRS contribution limits for the 401k Calculator or the Mifflin-St Jeor equation for the TDEE Calculator. If something looks wrong, tell us and we'll review it.
Our Editorial PolicyYour calculator inputs stay in your browser
The numbers you type into a calculator are processed in your browser and are not sent to our servers. Like most websites, we use cookies for analytics and for Google AdSense advertising — the Privacy Policy explains exactly which ones and how to manage your choices.
Read the Privacy PolicyWorks on phones, tablets and desktops
Every calculator is designed to work on mobile screens as well as desktops.
Free to use
All calculators are free and need no account. The site is supported by advertising.
Questions
Frequently asked questions
Quick answers about cost, accuracy, privacy and how to reach us.
Found a mistake or have an idea?
Mention the calculator's name and, if possible, the inputs you used.
Yes. Every calculator is free to use, as often as you like, with no account or sign-up. The site is funded by advertising.
Each calculator uses a published formula or official data (for example IRS limits or state tax rates for the year shown on the page). Results are only as accurate as the numbers you enter and the assumptions explained on each page. For important health, tax or financial decisions, confirm the result with a qualified professional.
No. Calculator inputs are processed in your browser and are not sent to our servers. Analytics and advertising cookies are described in our Privacy Policy.
Yes. The calculators are built to work on smartphones, tablets and computers.
Email support@tuffsearch.com for problems or suggestions@tuffsearch.com for new calculator ideas. Mention the calculator's name and, if possible, the inputs you used.
Start calculating
Not sure where to start? Open the All Calculators page to see every tool by category, or jump straight to the paycheck calculators if you want to check your take-home pay.