Useful answers, without the clutter.
Explore 51 free, private and mobile-friendly calculators and study tools built for users around the world.
A hydration goal that moves with you.
Adjust your daily water estimate for body weight, exercise and warm weather.
Open tool →Free toolA loan calculator for any currency
Compare monthly payments, total interest and the impact of extra payments anywhere in the world.
Open tool →Free toolA-Level UCAS Points Calculator
Add A-level grades and estimate their UCAS Tariff point total.
Open tool →Free toolAdd or remove any VAT or sales tax
Use any tax rate and currency to separate net price, tax amount and gross price.
Open tool →Free toolBrew the cup you meant to make.
Choose a method and scale coffee and water while keeping a reliable starting ratio.
Open tool →Free toolBuild a moving budget before box one
Estimate truck, movers, packing, travel, storage and a practical contingency.
Open tool →Free toolBuild a travel budget that crosses borders
Plan accommodation, food, transport, activities and contingency in your preferred currency.
Open tool →Free toolBuy enough paint. Not too much.
Estimate paint quantity and cost for your room walls.
Open tool →Free toolCollege GPA Calculator
Calculate semester and cumulative GPA on the common U.S. 4.0 scale.
Open tool →Free toolConvert everyday units instantly
Convert distance, weight and temperature without sending any information away.
Open tool →Free toolCount every tile before checkout.
Calculate tiles, boxes, wastage and an estimated material budget.
Open tool →Free toolEstimate your strongest rep.
Use a recent working set to estimate one-rep max and practical training loads.
Open tool →Free toolFeed everyone. Waste less.
Create a flexible food estimate based on guest count, meal style and event length.
Open tool →Free toolFinal Grade Needed Calculator
Find the exam mark needed to reach your target course grade.
Open tool →Free toolFind a meeting time across time zones
Compare three UTC offsets and preview the same meeting time for distributed teams.
Open tool →Free toolFind the energy hogs in your home
Estimate appliance electricity cost using watts, daily use and your utility rate.
Open tool →Free toolFind what each appliance costs.
Turn watts and usage hours into monthly electricity estimates.
Open tool →Free toolFind your daily energy baseline.
Estimate maintenance calories using the Mifflin–St Jeor equation.
Open tool →Free toolGerman Grade Converter
Convert an international result using the commonly used modified Bavarian formula.
Open tool →Free toolGive your credit card balance an end date
See payoff time and interest, then test the impact of one extra monthly payment.
Open tool →Free toolGST, without the guesswork.
Add or remove GST and see the exact tax split in seconds.
Open tool →Free toolHow much home fits your life?
Balance income, existing commitments and a comfortable EMI to find your buying range.
Open tool →Free toolKnow the score you need.
Calculate the final-exam score required to reach your target grade.
Open tool →Free toolKnow the weight carriers may charge
Compare actual and dimensional weight for international parcels using centimeters and kilograms.
Open tool →Free toolKnow your loan before you owe.
Free EMI, loan affordability and prepayment calculator for Indian borrowers.
Open tool →Free toolMake percentage changes understandable
Calculate increase, decrease, difference and reverse percentages for prices, metrics or research.
Open tool →Free toolMake your student-loan payoff visible
Estimate monthly payments, total interest and savings from paying extra.
Open tool →Free toolNCEA Credit Tracker
Track achieved, merit and excellence credits toward a personal study goal.
Open tool →Free toolPlan every kilometre.
Convert a race distance and finish time into pace and speed.
Open tool →Free toolPreview your take-home pay
Estimate a U.S. paycheck using adjustable federal, state, FICA and benefit deductions.
Open tool →Free toolPrice any road trip in local units
Works with kilometers or miles, litres or gallons, and any currency.
Open tool →Free toolPut your roof to work.
Estimate solar generation, bill savings and simple payback for a rooftop system.
Open tool →Free toolQuote the project, not the guess.
Turn effort, revisions, overhead and risk into a defensible project price.
Open tool →Free toolRent or buy? Compare the full picture
Model five-year housing costs using rent growth, appreciation, financing and ownership expenses.
Open tool →Free toolSee what time can do to money.
Model a starting balance, recurring deposits and compound growth.
Open tool →Free toolSee your debt-to-income ratio
Compare monthly debt with gross income and understand the ratio lenders often review.
Open tool →Free toolSet a sustainable freelance rate
Account for income goals, overhead, unpaid time and billable utilization in any market.
Open tool →Free toolSplit the check without the awkward math
Add a tip, divide the bill and round each person’s share in seconds.
Open tool →Free toolSwiss Weighted Grade Calculator
Calculate a weighted grade on the common Swiss 1–6 scale.
Open tool →Free toolTurn a goal into a monthly plan
Calculate the monthly contribution needed for a target in any currency.
Open tool →Free toolTurn eligible miles into a clear estimate
Calculate a potential U.S. standard-mileage amount by purpose and 2026 period.
Open tool →Free toolTurn monthly habits into long-term goals.
Estimate how regular investing may compound over time.
Open tool →Free toolUnderstand your BMI.
A quick, private estimate with a clear healthy-range guide.
Open tool →Free toolUniversity GPA Calculator
Track module grades and credit units on a configurable Singapore GPA scale.
Open tool →Free toolUniversity Grade Average
Calculate a credit-weighted average from Norwegian A–F course grades.
Open tool →Free toolWeighted Average Mark Calculator
Calculate a credit-weighted WAM for Australian university subjects.
Open tool →Free toolWeighted Grade Average
Calculate a weighted average on the Dutch 1–10 grading scale.
Open tool →Free toolWhat is your time really earning?
Convert annual salary into effective hourly value after work hours, commute and expenses.
Open tool →Free toolWill your words fit the clock?
Paste any draft to estimate reading, speech and presentation duration.
Open tool →Free toolYour age, down to the day.
Calculate elapsed years, months and days between two dates.
Open tool →Free toolYour real monthly mortgage payment
Estimate principal, interest, property taxes, insurance, PMI and HOA—not just the loan payment.
Open tool →