Precision tools
for everyday math.
Finance, automotive, health, home, conversions. Type the question. Get the answer. No signup, no ads in your face.
Six hubs. Every number
in its place.
Each hub opens onto the full toolset — calculators, reference tables, deep-linked value pages.
Money.
Loans, payoff, tax, crypto.
Automotive.
Tire PSI, HP, torque, boost.
Health.
BMI, body fat, macros, BMR.
Home.
Paint, concrete, tile, lumber.
Conversions.
PSI, HP, MPH, Nm, litres, °C.
Everyday.
%, age, date, tip, GPA.
The tools readers return to.
OEM cold PSI
for every car, every year.
Toyota · Honda · BMW · Audi · Tesla · Ford · Mercedes · VW · Nissan · Subaru. Front / rear split, street & sport setups, door-jamb reference.
Every page, one click away.
X vs Y unit pairs
32 vs 35 PSI, 500 vs 700 HP, 20 vs 25 °C — with delta and %.
Plus-sizing · speedo math
200+ plus-size comparisons with diameter, revs/mile, speedo error.
Payment × rate × term
Every common loan scenario pre-computed, with amortization.
Months to zero, by APR
Pick a balance, APR, and monthly payment — see the true cost.
The full library.
- FinanceOPEN ↗
Loan & Mortgage Calculator
Monthly payment, total interest, and full amortization — instant.
- FinanceOPEN ↗
Compound Interest Calculator
Watch your money compound — with regular contributions.
- FinanceOPEN ↗
Credit Card Payoff Calculator
See exactly how long until you're debt-free — and how much interest you'll waste paying minimum.
- FinanceOPEN ↗
Paycheck Calculator
Gross to net in seconds — federal tax, FICA, and state tax included.
- FinanceOPEN ↗
Retirement Calculator
Project your nest egg — with 401k matching and year-by-year growth.
- FinanceOPEN ↗
Personal Injury Settlement Calculator
Rough settlement range for a personal-injury claim — medicals, lost wages, and pain/suffering.
- FinanceOPEN ↗
Car Accident Settlement Calculator
Rough settlement range after a car accident — medicals, lost wages, pain & suffering, vehicle damage.
- FinanceOPEN ↗
SR-22 Insurance Cost Calculator
What you'll actually pay for car insurance with an SR-22 filing — and for how long.
- FinanceOPEN ↗
Workers' Comp Settlement Calculator
Rough settlement range for a workers' compensation claim — medicals, lost wages, impairment.
- FinanceOPEN ↗
Asbestos Exposure Compensation — Information Tool
Understand the typical compensation ranges and paths for asbestos exposure and mesothelioma cases.
- FinanceOPEN ↗
Tip Calculator
Tip, total, and per-person split — in one tap.
- FinanceOPEN ↗
Discount Calculator
Sale price, savings, and effective % off — instantly.
- FinanceOPEN ↗
Crypto Profit Calculator
Profit, loss, ROI — with fees, the way it really works.
- AutomotiveOPEN ↗
Tire Pressure Calculator
Cold PSI per corner — adjusted for load, rim size, and driving style.
- AutomotiveOPEN ↗
Boost to HP Estimator (Turbo / Supercharger)
Estimate HP gain from a given boost pressure on any engine — turbo or supercharged.
- AutomotiveOPEN ↗
Fuel Economy Calculator (MPG ↔ L/100km)
MPG, L/100km, and km/L — all three, from one tank.
- AutomotiveOPEN ↗
Tire Size Comparison
Will that plus-size fit? Check diameter, sidewall, and speedo error.
- AutomotiveOPEN ↗
Gearing Calculator (RPM ↔ Speed)
Your speed at any RPM, for any gear, with any tire size.
- AutomotiveOPEN ↗
Power-to-Weight Ratio Calculator
HP/ton, kW/kg — and a 0-100 km/h estimate.
- HealthOPEN ↗
BMI Calculator
Body Mass Index — plus healthy weight range.
- HealthOPEN ↗
Body Fat Percentage Calculator
Estimate body fat % with the US Navy tape-measure method — no calipers, no DEXA required.
- HealthOPEN ↗
BMR Calculator (Mifflin-St Jeor)
Basal Metabolic Rate — the calories you burn at rest.
- HealthOPEN ↗
TDEE Calculator
Total Daily Energy Expenditure — your actual calorie need.
- HealthOPEN ↗
Macro Calculator
Protein, carbs, fat — in grams, for your goal.
- MathOPEN ↗
Percentage Calculator
What's X% of Y? Get the answer instantly.
- MathOPEN ↗
Date Difference Calculator
Days, weeks, months, and working days between any two dates.
- HomeOPEN ↗
Paint Calculator
How much paint you need — by room size, coats, and coverage.
- HomeOPEN ↗
Concrete Calculator (Slab / Pad)
Cubic yards, cubic meters, and number of bags — for any slab.
- HomeOPEN ↗
Tile Calculator
How many tiles you really need — with waste factored in.
- ConversionsOPEN ↗
PSI to Bar Converter
Convert PSI to bar, kPa, and atm — tire pressures, turbo boost, hydraulics.
- ConversionsOPEN ↗
HP to kW Converter
Horsepower to kilowatts — mechanical, metric, or electrical HP.
- ConversionsOPEN ↗
Nm to lb-ft Converter (Torque)
Convert newton-metres to pound-feet — engine torque, wheel nuts, bolt specs.
- ConversionsOPEN ↗
Liters to Gallons Converter
Liters to US gallons and UK (imperial) gallons — fuel, beverages, pools.
- ConversionsOPEN ↗
MPH to KM/H Converter
Miles per hour to kilometers per hour, m/s, knots, and ft/s. Speed limits, top speeds, windspeed.
- ConversionsOPEN ↗
Length Converter
mm, cm, m, km, inches, feet, yards, miles — all at once.
- ConversionsOPEN ↗
Weight Converter
mg, g, kg, tons, ounces, pounds, stone — all at once.
- ConversionsOPEN ↗
Temperature Converter (°C ↔ °F ↔ K)
Celsius, Fahrenheit, Kelvin, Rankine — all in one shot.
- ConversionsOPEN ↗
Speed Converter (mph ↔ km/h ↔ knots)
km/h, mph, m/s, knots, ft/s — and Mach.
- NicheOPEN ↗
Age Calculator
Your exact age — years, months, days, and next birthday.
- NicheOPEN ↗
Pizza Dough Calculator (Baker's %)
Flour, water, salt, yeast — scaled to any number of pizzas.
- NicheOPEN ↗
GPA Calculator
Calculate your semester or cumulative GPA on a 4.0 scale — up to 8 courses.