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Engine compression, gear ratios, bolt preload, hydraulic force, brake bias, weld heat input, CV joint angles — thirty-plus calculators that handle the math so you can focus on the job. No filler forms. No dark patterns.
Static CR plus octane-need and quench-height flag.
Multi-cylinder with deck-clearance and head-gasket volume.
Mean piston speed plus a valve-float RPM warning band.
Duration @ .050" plus lobe separation angle overlap trend.
Installed vs removed height with spring-rate solver.
VE% estimate from cam duration, intake runner, target RPM.
CFM from CID, RPM, target VE — with safe-overhead picker.
Required lb/hr from HP, BSFC, duty-cycle budget.
Multi-stage transmission with tire-diameter output.
Working angle from ride-height vs droop geometry.
Compound-angle calc with vibration-risk band.
Side-by-side comparison of up to four tire sizes.
Camber/toe wear-score with shoulder-vs-feather read-out.
Slip-yoke working-angle and runout guidance.
Center distance from belt part-number and pulleys.
Teeth-based ratio with center distance solver.
Volume from block + radiator + heater core.
Capacity plus a viscosity-grade suggester by ambient temp.
Spring rate, safe-travel, and buckling flag.
MechCalc Pro is a small, focused reference site built for working technicians, machinists, restoration shops, and serious hobbyists who want a calculator that actually matches what they're holding in their hands. Each tool here was added because somebody on a forum asked a question that the usual "one-line calculator" sites couldn't answer properly — the missing friction loss, the wrong sign on retraction force, the assumption that every tire is 25.4" tall.
Who this site is for: engine builders who spec cam timing against a target RPM band, fabrication shops sizing hydraulic cylinders for press work, motorcycle and 4x4 owners sorting out CV or U-joint angles after a lift, brake-techs working out a master cylinder bore change, and welders calculating heat input before repair work on thin-wall tubing.
Who this site is not for: people who need a stamped engineering certificate, OEM-spec validation, or finite-element analysis. These calculators use textbook formulas — they're excellent for sizing, scoping, and sanity-checking a job, not for replacing a licensed engineer's review on safety-critical work like pressure vessels, lifting fixtures, or structural welds. Where units, sign conventions, or industry standards matter, the page itself calls them out so you don't shoot yourself in the foot.
How to read the results: every calculator shows the formula in plain language next to the output, lists the assumptions it makes (atmospheric pressure, dry friction coefficient, an 85% volumetric efficiency default, and so on), and offers a "what to do with this number" line. If the assumptions don't match your job, change the input — never trust a calculator that hides its math.
Known limitations: hydraulic and pneumatic outputs assume steady-state flow at the rated pressure — they don't simulate accumulator charging, valve spools, or thermal drift. Engine outputs are based on a naturally-aspirated, four-stroke model unless the page explicitly says otherwise. Welding heat input is the energy delivered to the workpiece, not the HAZ width or microstructure prediction. Brake bias numbers are static; they don't capture pad temperature, fluid boil, or proportioning-valve curves.
Last updated: 2026
Nothing personal. MechCalc Pro does not require an account, an email address, a phone number, or any sign-up step. You open a calculator, type numbers, read numbers, close the tab. We do not place any first-party tracking cookie, fingerprint, or unique identifier on your device, and we do not collect the values you enter into the calculators. All calculation runs locally in your browser.
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We do not sell, rent, lease, or trade personal information because we do not hold any. If a future feature requires saving inputs (a saved tune-up sheet, for example), that data will live only in your browser's local storage and you will be told before it is written.
This site is intended for working-age adults using it for work or serious hobby use. It is not directed at children under 13, and we do not knowingly collect any information from children.
If we change anything material — for example, if we add a feature that stores data, or change ad partners — the date at the top of this section will be updated and the change will be flagged in a short note above the calculators.
All content, calculators, formulas, and outputs on MechCalc Pro are provided for general informational and educational purposes only. They are not professional engineering advice, they are not a substitute for manufacturer specifications, and they are not a warranty of fitness for any particular purpose.
Mechanical, hydraulic, pneumatic, and welding work can cause serious injury, death, or property damage if performed incorrectly. Numbers produced by these calculators reflect simplified textbook models; they do not capture manufacturing tolerances, material defects, environmental conditions, wear, fatigue, regulatory codes (such as ASME, DOT, or AWS D1.1), or the specific service conditions of your job. Always cross-check critical values against the original equipment manufacturer's published specifications and a qualified engineer's review.
By using this site you agree that MechCalc Pro, its author, and its hosting provider are not liable for any loss or damage — direct, indirect, incidental, or consequential — arising from the use of, or the inability to use, the calculators or content presented here. If a calculation is going to inform a safety-critical decision (suspension, brakes, structural welds, pressure vessels, lifting, towing), treat it as a sanity check only and confirm with a licensed professional before you commit to the job.
External links, including the Google Ads Settings and AboutAds links in the Privacy section, are provided for convenience. We don't control their content and we're not responsible for what they say.
If you spot a calculation that is genuinely wrong — not a unit preference or a rounding convention, but an actual physics mistake — please reach out via the contact address listed on our hosting provider's record. Real corrections are welcome.