Lift Rate Calculator
“Lift rate” means four different things depending on who is asking, so this calculator covers all four: cost per lift for budgeting, capacity usage for forklift and crane safety, hoist lift speed from motor RPM and drum radius, and load per time for crew throughput. Pick the tab that matches your job, enter two or three numbers, and read the headline figure plus the working behind it.
Verdicts use this tool’s bands (comfortable up to 75%, high over 75% to 90%, near the limit over 90% to 100%, overload above 100%). A planning check, not a lift plan: rigging weight, wind and dynamic forces sit outside this percentage.
Quick Answer
The pre-filled examples give all four rates at a glance: $2,000 over 100 lifts is $20.00 per lift; 500 kg on a 2,500 kg machine uses 20.00% of capacity, comfortably in range; 90 RPM on a 0.25 m drum at 80% efficiency lifts at 1.885 m/s (6.18 ft/s), covering 3 m in 1.6 seconds; and 200 lb in 10 seconds is 20.00 lb/s. Each tab shows its own formula and verdict.
Key takeaways
- Four meanings, four tabs. The four rates share a name and nothing else; check you are on the right tab before quoting a figure.
- Capacity is the safety tab: verdict bands bite at 75%, 90% and 100%, and lifts above 75% of chart capacity count as critical lifts needing a written plan.
- The capacity percentage counts only what you type. Rigging weight is not added for you, so weigh slings and spreader bars into the load figure yourself.
- Hoist speed is geometry: RPM times 2π over 60, times drum radius, times efficiency. Double the radius and you double the speed, at half the torque margin.
- Quick Answer
- How to use the lift rate calculator
- The four lift rate formulas
- Worked examples for all four modes, checked against the tool
- Capacity bands: what the percentage should make you do
- Which lift rate do you need?
- What competing calculators miss
- Honest limits of this tool
- Frequently asked questions
- Add This Calculator to Your Website
- References
How to use the lift rate calculator
Choose a tab, fill its fields, and click Calculate. Results stay hidden until you calculate, and switching tabs hides the previous result so a stale figure never sits under the wrong mode.
- Cost per lift: add up everything the lifting operation cost (hire, fuel, operator, rigging, supervision), count the lifts it covered, and divide. That is the figure to budget with and compare contractors against. For the labour share of that total, the loaded labor rate calculator breaks a crew's true hourly cost out of wages, taxes and benefits.
- Capacity usage: enter the load and the machine's rated capacity for your actual setup, both in the same unit, and read the percentage plus its verdict band. On a crane, take capacity from the load chart at your working radius, not the brochure's headline rating.
- Hoist speed: enter drum RPM, drum or pulley radius in metres, and system efficiency. Add the optional lift height and the result adds the seconds one lift takes. The radius is half the diameter, and it acts like the arm in a lever, which is why the lever distance calculator is a useful companion when trading speed against force.
- Load per time: enter the total weight moved and the seconds it took. Per-second and per-minute rates come back together, ready for comparing crews, shifts or machines. Pair the rate with the cost per hour calculator to price the schedule it implies.
The four lift rate formulas
Each mode is one short formula, set out below. Hoist speed is the only three-step one: RPM to angular speed, angular speed to rope speed, rope speed discounted by efficiency.
Capacity usage (%) = Load weight ÷ Equipment capacity × 100
Hoist speed (m/s) = (RPM × 2π ÷ 60) × radius × (efficiency ÷ 100)
Load rate = Total load ÷ Time (× 60 for the per-minute figure)
The hoist-speed chain is worth seeing once, because each step is a place a hand calculation goes wrong. RPM is per minute, so dividing by 60 and multiplying by 2π converts it to angular speed in radians per second. Multiplying by the radius turns rotation into rope travel: one radian of drum rotation pulls one radius-length of rope. Efficiency then discounts that ideal for friction, which is why an 80% system at 90 RPM and 0.25 m radius delivers 1.885 m/s rather than the frictionless 2.356 m/s. The derivation follows the standard pulley relationships in the Engineering ToolBox pulley systems reference.
Worked examples for all four modes, checked against the tool
Every row below is a real run of this calculator. Type the same numbers in and you get the same figures back, including the verdict wording.
| Mode | Inputs | Result |
|---|---|---|
| Cost per lift | $2,000 over 100 lifts | $20.00 per lift |
| Cost per lift | $1,234.56 over 37 lifts | $33.37 per lift |
| Capacity usage | 500 kg on 2,500 kg | 20.00%, comfortable range |
| Capacity usage | 1,900 lb on 2,500 lb | 76.00%, high but within rating |
| Capacity usage | 2,600 kg on 2,500 kg | 104.00%, overload verdict |
| Hoist speed | 90 RPM, 0.25 m, 80%, 3 m height | 1.885 m/s, 3 m in 1.6 s |
| Hoist speed | 120 RPM, 0.5 m, 100%, 10 m height | 6.283 m/s, 10 m in 1.6 s |
| Load per time | 1,500 kg in 45 seconds | 33.33 kg/s (2,000.00 kg/min) |
Two rows deserve a second look. Exactly 100% capacity does not trigger the overload verdict; it lands in the near-the-limit band, because the overload rule is strictly above 100%. And at 0% efficiency the speed is 0.000 m/s and no lift time is shown: height is divided by speed only when the speed is above zero, rather than printing an infinite time.
Capacity bands: what the percentage should make you do
The percentage is only useful if it changes a decision. The four verdict bands line up with how lift planning treats chart capacity: comfortable work sits well under the rating, and the planning burden grows steeply past three-quarters of it.
| Capacity usage | Tool verdict | What it means in practice |
|---|---|---|
| Up to 75% | Within a comfortable working range | Normal operations with standard rigging checks; margin exists for small dynamic effects. |
| Over 75% to 90% | High but within rating | Critical-lift territory in common crane practice: documented plan, hazard check, pre-lift briefing. |
| Over 90% to 100% | Near the limit | Full rigging checks and a lift plan only. Weigh the load rather than estimating it. |
| Over 100% | OVERLOAD: do not lift | Over the rating. Bigger machine, lighter load, or a different configuration; no fourth option. |
The 75% planning threshold is not this page's invention: crane guidance treats lifts above 75% of rated chart capacity as critical lifts because wind, ground movement and load swing add forces the chart cannot see. OSHA's construction crane standard, 29 CFR 1926 Subpart CC, and the overhead crane rules in 29 CFR 1910.179 both put the duty on the operator to stay within the manufacturer's rating for the actual configuration. One gap to close yourself: this tool does not add rigging weight, so add slings and hook block into the load figure before you type it, or your 92% lift may really be a 97% lift.
Which lift rate do you need?
Match the tab to the question being asked, not to the numbers you happen to have. “What does each move cost us” is the cost tab; “how close are we to the limit” is capacity; sizing a hoist is speed; comparing two crews is load per time.
Advertisers use yet another “lift”: conversion lift, the percentage gain of an exposed group over a control group. That is a statistics concept, not a lifting mode, and no tab here computes it. Motor sizing for a target speed is a power question (load × gravity × speed, divided by efficiency); this page supplies the speed half of that job, the half power calculators assume you already know.
What competing calculators miss
Every rival on this keyword answers exactly one meaning of “lift rate”, as if the other three did not exist:
- Savvy Calculator's lift energy tool: prices the energy of a single lift from mass, height and efficiency. It never divides by a lift count, so there is no cost per lift to budget with, and no capacity or speed mode at all.
- Savvy Calculator's hoist motor power tool: sizes a motor in kW and HP from load, speed and efficiency. It assumes you already know the lifting speed; it cannot derive speed from RPM and drum radius, the number engineers usually lack.
- Crane capacity tools (TrueGeometry, CodingAce-style planners): the serious ones add rigging weight, hook block, dynamic factors, wind and slope, which this page openly does not. In exchange they are crane-chart-only: no cost per lift, no hoist speed, no throughput rate, and a form a forklift operator will never finish.
- Guide articles (EK Crane, Makana): solid on load charts and the 75% critical-lift rule, but reading material, not a tool; you still do the percentage by hand.
- The gap this page fills: all four meanings of lift rate behind one set of tabs, the speed derivation printed step by step, m/s to ft/s done for you, an optional height that turns speed into lift time, and capacity verdicts in plain language instead of a bare percentage.
Honest limits of this tool
Three behaviours are worth knowing. First, the unit selectors are labels, not converters: capacity usage is a ratio, so 500 kg on 2,500 kg and 500 lb on 2,500 lb both give 20.00%. Second, the optional height is forgiving to a fault: blank, zero or negative heights produce no time line and no warning. Third, the cost headline prints without thousands separators on very large results ($333333333.00, not $333,333,333.00) while the line under it formats the total properly; the arithmetic is identical.
No mode models acceleration, rope stretch, wind or load swing. Treat outputs as steady-state planning figures, and let a competent lift plan under your site's rules and the manufacturer's chart have the final word.
Frequently asked questions
There is no universal figure; it depends on equipment, labor rates, and lift complexity. Track it per operation and watch the trend: a rising cost per lift usually signals inefficiency, idle equipment, or lifts that should have been combined.
It is the legal maximum, not a target. Dynamic forces, wind, and imperfect rigging all add load beyond the static weight, and this tool lands exactly 100% in its near-the-limit band rather than overload, so most lift plans stay well under the rating.
Friction in the gearbox, sheaves, and rope system converts some motor power to heat. An 80% efficient system delivers 80% of the theoretical rope speed, so 2.3562 m/s at the drum becomes 1.885 m/s at the hook in the worked example.
Raise motor RPM, increase drum or pulley radius, or improve system efficiency. Each has trade-offs: higher RPM needs more power, and larger drums need more torque for the same load.
Yes. Run the same load through the Capacity usage tab for each machine's rating, and compare their cost per lift if you have operating costs for both.
No. The tool divides the load you type by the capacity you type and adds nothing. Weigh slings, shackles and spreader bars into the load figure yourself, because the equipment carries them too.
The time line appears only when the height is above zero and the calculated speed is above zero. A blank, zero or negative height, or 0% efficiency, skips the line silently instead of showing an error or an infinite time.
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References
- Occupational Safety and Health Administration (OSHA). Cranes and Derricks in Construction, 29 CFR 1926 Subpart CC. Accessed October 22, 2026.
- Occupational Safety and Health Administration (OSHA). Overhead and Gantry Cranes, 29 CFR 1910.179. Accessed October 22, 2026.
- Occupational Safety and Health Administration (OSHA). Crawler Locomotive and Truck Cranes, 29 CFR 1910.180. Accessed October 22, 2026.
- Occupational Safety and Health Administration (OSHA). Handling Materials, General, 29 CFR 1910.176. Accessed October 22, 2026.
- National Institute for Occupational Safety and Health (NIOSH), CDC. Applications Manual for the Revised NIOSH Lifting Equation, DHHS (NIOSH) Publication No. 94-110. Accessed October 22, 2026.
- The Engineering ToolBox. Pulleys: Effort Force, Mechanical Advantage and Efficiency. Accessed October 22, 2026.